| **Loans**                            | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Loans Receivable, Net [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| Loans                                | Loans and Allowance for Loan LossesGeneralLoans held for investment are stated at the principal amounts outstanding adjusted for purchase premiums/discounts, deferred net loan fees and costs, and unearned income.  FNB reports its loan portfolio by segments and classes, which are disaggregations of portfolio segments.  FNB's portfolio segments are:  Commercial and agricultural, Real estate, and Consumer loans.  The Commercial and agricultural loan and Consumer loan portfolios are not further segregated into classes.  The classes within the Real estate portfolio segment include Real estate - construction and Real estate mortgage, broken into 1-4 family residential mortgage and Commercial real estate mortgage loans. Loan fees and the incremental direct costs associated with originating loans are deferred and subsequently recognized over the life of the loan as an adjustment to interest income.In addition to originating loans we also purchase loans.  At acquisition purchased loans are designated as either purchased contractual loans ("PC loans") or purchased impaired loans ("PI loans"). PC loans are acquired loans where management believes it is probable that it will receive all principal as of the date of acquisition.  These loans are accounted for under the contractual cash flow method, under ASC 310-20.  Any discount or premium paid on PC loans is recorded in interest income using the effective yield method over the expected life of the loans.  PI loans are acquired loans where management believes, at acquisition date, it is probable that all principal on the acquired loans will not be received.  PI loans are placed in homogeneous risk based pools where accounting for projected cash flows is performed, as allowed under ASC 310-30.  Once a pool is established the individual loans within each pool do not change.  As management obtains new information related to changes in expected principal loss and expected cash flows, by pool, we record either an increase in yield when new expected cash flows increase, an allowance for loan losses when new expected cash flows decline, or a decrease in yield when there is only a timing difference in expected cash flows.Loans acquired in the Merger ("Granite Purchased Loans") included PI loans and PC loans. Loans designated as PC loans included performing revolving consumer and performing revolving commercial loans on acquisition date. During the three months ended March 31, 2012, CommunityOne purchased $61.9 million of performing residential mortgage loans, including premiums of $2.3 million. These loan purchases are accounted for as PC loans.ALL MethodologyFNB's Allowance for Loan Losses ("ALL"), which is utilized to absorb actual losses in the loan portfolio, is maintained at a level consistent with management's best estimate of probable loan losses to be incurred as of the balance sheet date.  Management assesses FNB's ALL quarterly.  This assessment includes a methodology that separates the total loan portfolio into homogeneous loan classifications for purposes of evaluating risk.  The required allowance is calculated by applying a risk adjusted reserve requirement to the dollar volume of loans within a homogenous group.  For purposes of the ALL, FNB has grouped its loans into pools according to the loan segmentation regime employed on schedule RC-C of the FFIEC's Consolidated Report of Condition and Income.  Major loan portfolio subgroups include: risk graded commercial loans, mortgage loans, home equity loans, retail loans and retail credit lines.  Management also analyzes the loan portfolio on an ongoing basis to evaluate current risk levels, and risk grades are adjusted accordingly.  While management uses the best information available to make evaluations, future adjustments may be necessary, if economic or other conditions differ substantially from the assumptions used.Historical loss rates are calculated by associating losses to the risk-graded pool to which they relate for each of the previous eight quarters. Then, using a look back period beginning in third quarter 2006, loss factors are calculated for each risk-graded pool. In addition to FNB's ability to use its own historical loss data and migration between risk grades, it has a rigorous process for computing the qualitative factors that impact the ALL.  A committee, independent of the historical loss migration team, reviews risk factors that may impact the ALL.  Some factors are statistically quantifiable, such as concentration, growth, delinquency, and nonaccrual risk by loan type, while other factors are qualitative in nature, such as staff competency, competition within our markets, economic and regulatory changes impacting the loans held for investment.FNB lends primarily in North Carolina.  As of March 31, 2013, a substantial majority of the principal amount of the loans held for investment in its portfolio was to businesses and individuals in North Carolina.  This geographic concentration subjects the loan portfolio to the general economic conditions within this area.  The risks created by this concentration have been considered by management in the determination of the adequacy of the ALL.  Management believes the ALL is adequate to cover estimated losses on loans at each balance sheet date.During the three month period ended March 31, 2013, FNB charged off $3.0 million in loans and realized $3.2 million in recoveries, for $0.2 million of net recoveries.  The majority of the loans charged off were loans that were previously impaired and had specific reserves assigned in prior periods.The ALL, as a percentage of loans held for investment, was 2.66% at March 31, 2013, compared to 3.19% at March 31, 2012.  At December 31, 2012, the ALL, as a percentage of loans held for investment, was 2.49%.Risk GradesThe risk-grade categories presented in the following table, which are standard categories used by the bank regulators, are:Pass - Loans categorized as Pass are higher quality loans that have adequate sources of repayment and little risk of collection.Special Mention - A Special Mention loan has potential weaknesses that deserve management's close attention.  If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution's credit position at some future date.  Special Mention loans are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.Substandard - A Substandard loan is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any.  Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt.  They are characterized by the distinct possibility that FNB will sustain some loss if the deficiencies are not corrected.  Loss potential, while existing in the aggregate amount of Substandard loans, does not have to exist in individual assets classified Substandard.Doubtful - A loan classified as Doubtful has all the weaknesses inherent in one classified Substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.  The possibility of loss is extremely high, but because of certain important and reasonable specific pending factors, which may work to the advantage of strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined.  Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral and refinancing plans.Loans categorized as Special Mention or worse are considered Criticized.  Loans categorized as Substandard or Doubtful are considered Classified.  Purchased loans acquired in the Merger are recorded at estimated fair value on the date of acquisition without the carryover of related ALL.  The table below includes $70.0 million and $60.6 million in Granite Purchased Loans categorized as Substandard or Doubtful at March 31, 2013 and December 31, 2012, respectively.  The following table presents loans held for investment balances by risk grade as of March 31, 2013:(dollars in thousands) Pass Special Mention Substandard Doubtful    (Ratings 1-5) (Rating 6) (Rating 7) (Rating 8) TotalCommercial and agricultural $67,700 $3,416 $6,076 $298 $77,490Real estate - construction 41,979 1,817 13,857 — 57,653Real estate - mortgage:          1-4 family residential 471,592 14,785 34,431 — 520,808Commercial 290,610 42,767 81,450 168 414,995Consumer 42,081 171 359 208 42,819Total $913,962 $62,956 $136,173 $674 $1,113,765The following table presents loans held for investment balances by risk grade as of December 31, 2012:(dollars in thousands) Pass Special Mention Substandard Doubtful    (Ratings 1-5) (Rating 6) (Rating 7) (Rating 8) TotalCommercial and agricultural $69,003 $3,447 $6,953 $301 $79,704Real estate - construction 40,117 2,031 16,266 — 58,414Real estate - mortgage:          1-4 family residential 504,819 15,855 32,625 239 553,538Commercial 296,271 50,275 95,126 164 441,836Consumer 42,495 178 426 444 43,543Total $952,705 $71,786 $151,396 $1,148 $1,177,035Loans included in the preceding loan composition table are net of participations sold.  Loans are increased by net loan premiums and deferred loan discounts or fees of $2.6 million at March 31, 2013.  Loans are increased by net deferred loan discounts or fees of  $3.6 million at December 31, 2012.At March 31, 2013 and December 31, 2012, loans held for sale consisted of originated residential mortgage loans held for sale at the lower of cost or fair market value.Loans serviced for others are not included in the consolidated balance sheet.  The unpaid principal balance of loans serviced for others amounted to $109.7 million at March 31, 2013 and $65.1 million at December 31, 2012.Loans PledgedTo borrow from the FHLB, members must pledge collateral to secure advances and letters of credit.  Acceptable collateral includes, among other types of collateral, a variety of residential, multifamily, home equity lines and second mortgages, and commercial loans.  Gross loans of $256.1 million and $270.2 million were pledged to collateralize FHLB advances and letters of credit at March 31, 2013 and December 31, 2012, respectively, of which there was $14.2 million and $19.1 million of credit availability for borrowing, respectively. At March 31, 2013, $33.5 million of loans were pledged to collateralize potential borrowings from the Federal Reserve Discount Window, of which $26.2 million was available as borrowing capacity.Nonaccruing and Impaired LoansInterest income on loans is calculated by using the interest method based on the daily outstanding balance.  The recognition of interest income is discontinued when, in management's opinion, the collection of all or a portion of interest becomes doubtful.  Loans are returned to accrual status when the factors indicating doubtful collectability cease to exist and the loan has performed in accordance with its terms for a demonstrated period of time.  The past due status of loans is based on the contractual payment terms.  Had nonaccruing loans been on accruing status, interest income would have been higher by $0.9 million and $1.5 million for the three months ended March 31, 2013 and March 31, 2012, respectively. At March 31, 2013 and December 31, 2012, FNB had certain impaired loans of $70.5 million and $79.2 million, respectively, which were on nonaccruing interest status.All loan classes are considered past due when the contractual amounts due with respect to principal and interest are not received within 30 days of the contractual due date.  When FNB cannot reasonably expect full and timely repayment of its loan, the loan is placed on nonaccrual.  All loan classes on which principal or interest is in default for 90 days or more are put on nonaccrual status, unless there is sufficient documentation to conclude that the loan is well secured and in the process of collection.  A debt is "well-secured" if collateralized by liens on or pledges of real or personal property, including securities, that have a realizable value sufficient to discharge the debt in full; or by the guarantee of a financially responsible party.  A debt is "in process of collection" if collection is proceeding in due course either through legal action, including judgment enforcement procedures, or, in appropriate circumstances, through collection efforts not involving legal action that are reasonably expected to result in repayment of the debt or its restoration to a current status.Loans that are less than 90 days delinquent may also be placed on nonaccrual if deterioration in the financial condition of the borrower has increased the probability of less than full repayment.At the time a loan is placed on nonaccrual, all accrued, unpaid interest is charged off, unless it is documented that repayment of all principal and presently accrued but unpaid interest is probable.  Charge-offs of accrued and unpaid interest are charged against the current year's interest income and not against the current ALL.For all loan classes, a nonaccrual loan may be returned to accrual status when FNB can reasonably expect continued timely payments until payment in full.  All prior arrearage does not have to be eliminated, nor do all previously charged-off amounts need to have been recovered, but the loan can still be returned to accrual status if the following conditions are met:  (1) all principal and interest amounts contractually due (including arrearage) are reasonably assured of repayment within a reasonable period; and (2) there is a sustained period of repayment performance (generally a minimum of six months) by the borrower, in accordance with the contractual terms involving payments of cash or cash equivalents.For all classes within all loan portfolios, cash receipts received on nonaccrual loans are applied entirely against principal until the loan or lease has been collected in full, after which time any additional cash receipts are recognized as interest income. For all loan classes, as soon as any loan becomes uncollectible, the loan will be charged down or charged off as follows:•If unsecured, the loan must be charged off in full.•If secured, the outstanding principal balance of the loan should be charged down to the net liquidation value of the collateral.Loans should be considered uncollectible when:•No regularly scheduled payment has been made within four months and the determination is made that any further payment is unlikely, or•The loan is unsecured, the borrower has filed for bankruptcy protection and there is no other (guarantor, etc.) support from an entity outside of the bankruptcy proceedings.Based on a variety of credit, collateral and documentation issues, loans with lesser degrees of delinquency or obvious loss may also be deemed uncollectible.The following table presents an aging analysis of accruing and nonaccruing loans as of March 31, 2013:(dollars in thousands) Accruing          30-59 days past due 60-89 days past due More than 90 days past due Nonaccrual Total past due and nonaccrual Current and accruing Total LoansPC and Originated Loans              Commercial and agricultural $30 $1 $— $2,350 $2,381 $62,200 $64,581Real estate - construction 367 — — 11,762 12,129 43,191 55,320Real estate - mortgage:              1-4 family residential 2,722 82 55 19,111 21,970 462,224 484,194Commercial 931 147 — 37,217 38,295 224,247 262,542Consumer 208 12 — 63 283 40,961 41,244Total $4,258 $242 $55 $70,503 $75,058 $832,823 $907,881PI Loans              Commercial and agricultural $1,056 $60 $811 $— $1,927 $10,982 $12,909Real estate - construction — 48 523 — 571 1,761 2,332Real estate - mortgage:             1-4 family residential 896 — 3,530 — 4,426 32,481 36,907Commercial 3,836 2,896 15,533 — 22,265 130,168 152,433Consumer 3 — 1 — 4 1,299 1,303Total $5,791 $3,004 $20,398 $— $29,193 $176,691 $205,884Total Loans $10,049 $3,246 $20,453 $70,503 $104,251 $1,009,514 $1,113,765The following table presents an aging analysis of accruing and nonaccruing loans as of December 31, 2012:(dollars in thousands) Accruing          30-59 days past due 60-89 days past due More than 90 days past due Nonaccrual Total past due and nonaccrual Current and accruing Total LoansPC and Originated Loans              Commercial and agricultural $515 $— $50 $2,746 $3,311 $61,727 $65,038Real estate - construction 26 119 — 14,297 14,442 41,290 55,732Real estate - mortgage:              1-4 family residential 6,173 880 — 18,372 25,425 488,898 514,323Commercial 617 — 177 43,621 44,415 226,948 271,363Consumer 24 — — 206 230 41,957 42,187Total $7,355 $999 $227 $79,242 $87,823 $860,820 $948,643PI Loans              Commercial and agricultural $100 $1 $1,103 $— $1,204 $13,462 $14,666Real estate - construction 117 — 655 — 772 1,910 2,682Real estate - mortgage:              1-4 family residential 1,308 495 4,678 — 6,481 32,734 39,215Commercial 2,559 4,300 17,384 — 24,243 146,230 170,473Consumer 4 — 13 — 17 1,339 1,356Total $4,088 $4,796 $23,833 $— $32,717 $195,675 $228,392Total Loans $11,443 $5,795 $24,060 $79,242 $120,540 $1,056,495 $1,177,035All PI loans are considered to be accruing for all periods presented, in accordance with ASC 310-30.A loan is considered impaired, based on current information and events, if it is probable that FNB will be unable to collect the scheduled payments of principal and interest when due according to the contractual terms of the loan agreement. If the loan has been modified to provide relief to the borrower, the loan is deemed to be impaired if all principal and interest will not be repaid according to the original contract.  All loans meeting the definition of Doubtful should be considered impaired. When a loan has been determined to be impaired, the amount of the impairment is measured using the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, the observable market price of the loan, or the fair value of the collateral if the loan is collateral dependent.  When the present value of expected future cash flows is used, the effective interest rate is the original contractual interest rate of the loan adjusted for any premium or discount.  When the contractual interest rate is variable, the effective interest rate of the loan changes over time.  A specific reserve is established as a component of the ALL when a loan has been determined to be impaired.  Subsequent to the initial measurement of impairment, if there is a significant change to the impaired loan's expected future cash flows, or if actual cash flows are significantly different from the cash flows previously estimated, FNB recalculates the impairment and appropriately adjusts the specific reserve.  Similarly, if FNB measures impairment based on the observable market price of an impaired loan or the fair value of the collateral of an impaired collateral-dependent loan, FNB will adjust the specific reserve if there is a significant change in either of those bases.When a loan is impaired and principal and interest is in doubt when contractually due, interest income is not recognized.  Cash receipts received on nonaccruing impaired loans within any class are generally applied entirely against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income.  Cash receipts received on accruing impaired loans within any class are applied in the same manner as accruing loans that are not considered impaired.The following table summarizes information relative to impaired loans for the dates indicated:  March 31, 2013 December 31, 2012(dollars in thousands) BalanceAssociated Reserves BalanceAssociated ReservesImpaired loans, held for sale $—$— $—$—Impaired loans, not individually reviewed for impairment 5,946— 6,017—Impaired loans, individually reviewed, with no impairment 56,985— 62,282—Impaired loans, individually reviewed, with impairment 16,0973,129 15,3121,737Total impaired loans, excluding purchased impaired * $79,028$3,129 $83,611$1,737       Purchased impaired loans with subsequent deterioration $176,0485,373 $192,1155,373Purchased impaired loans with no subsequent deterioration $29,836— $36,277—Total Reserves  $8,502  $7,110       Average impaired loans calculated using a simple average $76,319  $94,754 * Included at March 31, 2013 and December 31, 2012 were $3.6 million and $4.5 million, respectively, in restructured and performing loans.The following table presents loans held for investment on nonaccrual status by loan class for the dates indicated:(dollars in thousands)      March 31, 2013 December 31, 2012Loans held for investment:    Commercial and agricultural $2,350 $2,746Real estate - construction 11,762 14,297Real estate - mortgage:    1-4 family residential 19,111 18,372Commercial 37,217 43,621Consumer 63 206Total nonaccrual loans $70,503 $79,242Loans more than 90 days delinquent, still on accrual $— $227Total nonperforming loans $70,503 $79,469There were no loans held for sale on nonaccrual status as of March 31, 2013 or December 31, 2012.The following table presents individually reviewed impaired loans and purchased impaired loans with subsequent credit deterioration, segregated by portfolio segment, and the corresponding reserve for impaired loan losses as of March 31, 2013:    Unpaid  (dollars in thousands) Recorded Principal Related  Investment Balance AllowanceWith no related allowance recorded:        Commercial and agricultural $875 $1,413 $—  Real estate - construction 8,953 14,910 —  Real estate - mortgage:      1-4 family residential 14,310 17,861 —Commercial 32,847 40,093 —  Consumer — — —Total $56,985 $74,277 $—With an allowance recorded:        Commercial and agricultural $917 $917 $227  Real estate - construction 2,080 2,159 501  Real estate - mortgage:      1-4 family residential 4,599 5,360 1,317Commercial 8,501 10,921 1,084  Consumer — — —Total $16,097 $19,357 $3,129Total individually evaluated impaired loans        Commercial and agricultural $1,792 $2,330 $227  Real estate - construction 11,033 17,069 501  Real estate - mortgage:      1-4 family residential 18,909 23,221 1,317Commercial 41,348 51,014 1,084  Consumer — — —Total $73,082 $93,634 $3,129       PI loans with subsequent credit deterioration:        Commercial and agricultural $9,930 $9,800 $545  Real estate - construction 1,986 1,924 197  Real estate - mortgage:           1-4 family residential 33,174 33,776 730     Commercial 129,655 131,753 3,351  Consumer 1,303 1,012 550Total $176,048 $178,265 $5,373The following table presents individually reviewed impaired loans, segregated by portfolio segment, and the corresponding reserve for impaired loan losses as of December 31, 2012:    Unpaid  (dollars in thousands) Recorded Principal Related  Investment Balance AllowanceWith no related allowance recorded:        Commercial and agricultural $1,755 $2,608 $—  Real estate - construction 11,875 18,553 —  Real estate - mortgage:      1-4 family residential 16,437 20,764 —Commercial 32,215 38,585 —  Consumer — — —Total $62,282 $80,510 $—With an allowance recorded:        Commercial and agricultural $579 $602 $282  Real estate - construction 1,658 1,843 82  Real estate - mortgage:      1-4 family residential 1,681 1,745 607Commercial 11,394 14,714 766  Consumer — — —Total $15,312 $18,904 $1,737Total individually evaluated impaired loans        Commercial and agricultural $2,334 $3,210 $282  Real estate - construction 13,533 20,396 82  Real estate - mortgage:      1-4 family residential 18,118 22,509 607Commercial 43,609 53,299 766  Consumer — — —Total $77,594 $99,414 $1,737PI loans with subsequent credit deterioration:        Commercial and agricultural $11,533 $11,728 $524  Real estate - construction 2,285 2,236 200  Real estate - mortgage:           1-4 family residential 34,961 35,802 711     Commercial 141,974 145,704 3,388  Consumer 1,362 1,147 550Total $192,115 $196,617 $5,373The following summary includes impaired loans individually reviewed as well as impaired loans held for sale.  Average recorded investment and interest income recognized on impaired loans, segregated by portfolio segment, is shown in the following table as of March 31, 2013 and March 31, 2012:  For Three Months Ended For Three Months Ended  March 31, 2013 March 31, 2012  Average Interest Average Interest(dollars in thousands) Recorded Income Recorded Income  Investment Recognized Investment RecognizedWith no related allowance recorded:          Commercial and agricultural $886 $— $3,132 $7  Real estate - construction 9,233 — 13,414 4  Real estate - mortgage:        1-4 family residential 13,472 26 18,199 6Commercial 34,010 87 29,810 30  Consumer — — 399 —Total $57,601 $113 $64,954 $47With an allowance recorded:          Commercial and agricultural $917 $5 $1,668 $—  Real estate - construction 2,111 — 12,050 2  Real estate - mortgage:        1-4 family residential 4,666 8 12,965 18Commercial 8,663 4 14,522 8  Consumer — — 211 —Total $16,357 $17 $41,416 $28Total:          Commercial and agricultural $1,803 $5 $4,800 $7  Real estate - construction 11,344 — 25,464 6  Real estate - mortgage:        1-4 family residential 18,138 34 31,164 24Commercial 42,673 91 44,332 38  Consumer — — 610 —Total $73,958 $130 $106,370 $75Impaired loans also include loans for which FNB may elect to grant a concession, providing terms more favorable than those prevalent in the market (e.g., rate, amortization term), and formally restructure due to the weakening credit status of a borrower.  Restructuring is designed to facilitate a repayment plan that minimizes the potential losses that FNB otherwise may have to incur.  If these impaired loans are on nonaccruing status as of the date of restructuring, the loans are included in nonperforming loans.  Nonperforming restructured loans will remain as nonperforming until the borrower can demonstrate adherence to the restructured terms for a period of no less than six months and when it is otherwise determined that continued adherence is reasonably assured.  Some restructured loans continue as accruing loans after restructuring if the borrower is not past due at the time of restructuring, adequate collateral valuations support the restructured loans, and the cash flows of the underlying business appear adequate to support the restructured debt service.  Not included in nonperforming loans are loans that have been restructured that were performing as of the restructure date.  At March 31, 2013, there was $18.2 million in restructured loans, of which $3.6 million in loans were accruing and in a performing status.  At December 31, 2012, there was $20.8 million in restructured loans, of which $4.5 million in loans were accruing and in a performing status.Sale of Problem LoansDuring 2012, FNB sold loans to third party buyers in order to reduce its problem loan exposure.  These loans were transferred to loans held for sale at the time FNB received a signed contract for the purchase of the loans.  Prior to transferring these loans to loans held for sale, the loans were marked down to the contract price less associated selling costs.  All transactions were conducted at arm's length and loans were sold without recourse.  The following table presents sold loans by portfolio segment for the periods indicated below: For Three Months Ended For Three Months Ended March 31, 2013 March 31, 2012(dollars in thousands)Number Recorded Contract Number Recorded Contract of Loans Investment Pricing of Loans Investment PricingCommercial and agricultural— $— $— — $— $—Real estate - construction— — — 1 3,800 4,050Real estate - mortgage:           1-4 family residential   1 150 150Commercial— — — — — —Consumer— — — — — —Total— $— $— 2 $3,950 $4,200Granite Purchased LoansGranite Purchased Loans include PI Loans and PC Loans.  PC Loans include performing revolving consumer and commercial loans on October 21, 2011, the acquisition date.PI Loans are segregated into pools and recorded at estimated fair value on the date of acquisition without the carryover of the related ALL.  PI Loans are accounted for under ASC 310-30 when the loans have evidence of credit deterioration since origination and it is probable at the date of acquisition we will not collect all contractually required principal and interest payments.  Evidence of credit quality deterioration as of the date of acquisition may include statistics such as past due status, nonaccrual status and risk grade.  PI Loans generally meet FNB's definition for nonaccrual status; however, even if the borrower is not currently making payments, FNB will classify loans as accruing if we can reasonably estimate the amount and timing of future cash flows.All Granite Purchased PI Loans are presented on an accruing basis. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference.Periodically, we estimate the expected cash flows for each pool of the PI Loans and evaluate whether the expected cash flows for each pool have changed from prior estimates.  Decreases to the expected cash flows will generally result in a provision for loan losses.  Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges, or reclassification from nonaccretable difference to accretable yield with a positive impact on future interest income.  Excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows.  We have elected to account for the Granite Purchased PI Loans under ASC 310-30 and the Granite Purchased PC Loans under ASC 310-20.  At March 31, 2013, and December 31, 2012, our financial statements reflected a PI Loan ALL of $5.4 million and $5.4 million, respectively, and an ALL for PC Loans of $0.8 million and $0.5 million, respectively.The following table presents the balance of all Granite Purchased Loans:  At March 31, 2013(dollars in thousands) Purchased Impaired Purchased Contractual Total Purchased Loans UnpaidPrincipalBalanceCommercial and agricultural $12,909 $5,701 $18,610 $18,107Real estate - construction 2,328 — 2,328 2,281Real estate - mortgage:           1-4 family residential 36,907 25,879 62,786 64,906   Commercial 152,437 — 152,437 157,312Consumer 1,303 — 1,303 1,008       Total $205,884 $31,580 $237,464 $243,614  At December 31, 2012(dollars in thousands) Purchased Impaired Purchased Contractual TotalPurchased Loans UnpaidPrincipalBalanceCommercial and agricultural $14,666 $7,311 $21,977 $21,692Real estate - construction 2,682 — 2,682 2,677Real estate - mortgage:           1-4 family residential 39,215 27,484 66,699 69,200   Commercial 170,467 49 170,516 176,347Consumer 1,362 — 1,362 1,144       Total $228,392 $34,844 $263,236 $271,060The table below includes only those Granite Purchased Loans accounted for under the expected cash flow method (PI Loans) for the periods indicated.  These tables do not include PC Loans, including Granite Purchased PC Loans or purchased performing residential mortgage loans.   For Three Months Ended For Three Months Ended  March 31, 2013 March 31, 2012  Purchased Impaired Purchased Impaired(dollars in thousands) Carrying Amount FutureAccretion Carrying Amount Future AccretionBalance, beginning of period $228,392 $30,299 $330,836 $47,804  Accretion 4,203 (4,203) 5,772 (5,772)  Payments received (25,928) — (23,110) —  Foreclosed and transferred to OREO (783) — (3,109) —Subtotal before allowance 205,884 26,096 310,389 42,032Allowance for credit losses (5,373) — — —Net carrying amount, end of period $200,511 $26,096 $310,389 $42,032Allowance for Loan LossesAn analysis of the changes in the ALL is as follows:  For Three Months Ended(dollars in thousands) March 31, 2013 March 31, 2012Balance, beginning of period $29,314 $39,360Provision for losses charged to continuing operations 110 3,067Net charge-offs:    Charge-offs (3,010) (4,015)Recoveries 3,227 1,383Net recoveries (charge-offs) 217 (2,632)Balance, end of period $29,641 $39,795Annualized net charge-offs (recoveries) during the period to average loans (0.07)% 0.87%Annualized net charge-offs (recoveries) during the period to ALL (2.93)% 26.60%Allowance for loan losses to loans held for investment (1) 2.66 % 3.19%(1) Excludes discontinued operations.The following table presents ALL activity by portfolio segment for the three months ended March 31, 2013:      Real Estate - Mortgage    (dollars in thousands) Commercial and Agricultural Real Estate - Construction 1-4 Family Residential Commercial Consumer Total            ALL:            Beginning balance at January 1, 2013 $3,238 $4,987 $8,701 $9,627 $2,761 $29,314Charge-offs (319) (344) (632) (891) (824) (3,010)Recoveries 278 796 185 932 1,036 3,227Provision 176 155 549 (377) (393) 110Ending balance at March 31, 2013 $3,373 $5,594 $8,803 $9,291 $2,580 $29,641The following table presents ALL activity by portfolio segment for the three months ended March 31, 2012:      Real Estate - Mortgage    (dollars in thousands) Commercial and Agricultural Real Estate - Construction 1-4 Family Residential Commercial Consumer TotalALL:                        Beginning balance at January 1, 2012 $5,776 $11,995 $8,885 $11,063 $1,641 $39,360Charge-offs (694) (1,775) (705) (38) (803) (4,015)Recoveries 254 601 133 74 321 1,383Provision 669 91 3,790 (2,300) 817 3,067Ending balance at March 31, 2012 $6,005 $10,912 $12,103 $8,799 $1,976 $39,795The following table details the recorded investment in loans related to each segment in the allowance for loan losses by portfolio segment and disaggregated on the basis of impairment evaluation methodology at March 31, 2013:      Real Estate - Mortgage    (dollars in thousands) Commercial and Agricultural Real Estate - Construction 1-4 Family Residential Commercial Consumer TotalALL:              Individually evaluated for impairment $227 $501 $1,317 $1,084 $— $3,129  Collectively evaluated for impairment 2,601 4,896 6,756 4,856 2,030 21,139  PI loans evaluated for credit impairment 545 197 730 3,351 550 5,373  PI loans with no credit deterioration — — — — — —Total ALL $3,373 $5,594 $8,803 $9,291 $2,580 $29,641Loans held for investment              Individually evaluated for impairment $1,792 $11,033 $18,909 $41,348 $— $73,082  Collectively evaluated for impairment 62,790 44,292 464,992 221,209 41,516 834,799  PI loans with subsequent credit deterioration 9,930 1,986 33,174 129,655 1,303 176,048  PI loans with no credit deterioration 2,978 342 3,733 22,783 — 29,836Total loans $77,490 $57,653 $520,808 $414,995 $42,819 $1,113,765The following table details the recorded investment in loans related to each segment in the allowance for loan losses by portfolio segment and disaggregated on the basis of impairment evaluation methodology at December 31, 2012:       Real Estate - Mortgage    (dollars in thousands) Commercial and Agricultural Real Estate - Construction 1-4 Family Residential Commercial Consumer TotalALL:              Individually evaluated for impairment $282 $82 $607 $766 $— $1,737  Collectively evaluated for impairment 2,432 4,705 7,383 5,473 2,211 22,204  PI loans evaluated for credit impairment 524 200 711 3,388 550 5,373  PI loans with no credit deterioration — — — — — —Total ALL $3,238 $4,987 $8,701 $9,627 $2,761 $29,314Loans held for investment              Individually evaluated for impairment $2,334 $13,533 $18,118 $43,609 $— $77,594  Collectively evaluated for impairment 62,704 42,199 496,205 227,760 42,181 871,049  PI loans with subsequent credit deterioration 11,533 2,285 34,961 141,974 1,362 192,115  PI loans with no credit deterioration 3,133 397 4,254 28,493 — 36,277Total loans $79,704 $58,414 $553,538 $441,836 $43,543 $1,177,035Troubled Debt RestructuringThe following table presents a breakdown of troubled debt restructurings that were restructured during the three months ended March 31, 2013 and March 31, 2012, segregated by portfolio segment:  For Three Months Ended March 31, 2013 For Three Months Ended March 31, 2012    Pre-Modification Post-Modification   Pre-Modification Post-Modification    Outstanding Outstanding   Outstanding Outstanding(dollars in thousands) Number Recorded Recorded Number Recorded Recorded  of Loans Investment Investment of Loans Investment InvestmentCommercial and agricultural — $— $— — $— $—Real estate - construction — — — 2 192 192Real estate - mortgage:               1-4 family residential 4 1,777 1,773 8 210 210   Commercial 1 1,151 807 — — —Consumer — — — 1 24 24    Total 5 $2,928 $2,580 $11 $426 $426During the three months ended March 31, 2013, FNB modified 5 loans that were considered to be troubled debt restructurings.  FNB extended the terms and modified the interest rate for each of these loans. During the three months ended March 31, 2012, FNB modified eleven loans that were considered to be troubled debt restructurings.  FNB extended the terms for nine of these loans, the interest rate was lowered for one of these loans, and the remaining loan was modified for multiple reasons.There were no loans restructured in the twelve months prior to March 31, 2013 that went into default during the three months ended March 31, 2013. There were also no loans restructured in the twelve months prior to March 31, 2012 that went into default during the three months ended March 31, 2012.In the determination of the ALL, management considers troubled debt restructurings and any subsequent defaults in these restructurings as impaired loans.  The amount of the impairment is measured using the present value of expected future cash flows discounted at the loan's effective interest rate, the observable market price of the loan, or the fair value of the collateral if the loan is collateral dependent.Unfunded CommitmentsThe reserve for unfunded commitments, which is included in other liabilities, is calculated by determining the type of commitment and the remaining unfunded commitment for each loan.  Based on the type of commitment, an expected usage percentage to the remaining unfunded balance is applied.  The expected usage percentage is multiplied by the historical losses and qualitative and environmental factors for each loans pool as defined in the regular ALL calculation to determine the appropriate level of reserve.  The following describes our method for determining the unfunded commitment:•Straight Lines of Credit - Unfunded balance of line of credit•Revolving Lines of Credit - Average Utilization (for the last 12 months) less Current Utilization•Letters of Credit - a 10% utilization is appliedThe reserve for unfunded commitments was $0.6 million as of March 31, 2013 and $0.6 million at December 31, 2012. |

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| - Definition
The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=7880640&loc=SL6953791-111525
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