| **Discontinued Operations**                                   | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Discontinued Operation, Additional Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Discontinued Operations                                       | Discontinued OperationsAll operations of Dover, a subsidiary of CommunityOne, were discontinued as of March 17, 2011.  Dover, acquired by FNB in 2003, originated, underwrote and closed mortgage loans for sale into the secondary market.  It maintained a retail origination network based in Charlotte, North Carolina, which originated loans for properties located in North Carolina.  Dover also engaged in the wholesale mortgage origination business and conducted retail mortgage origination business outside of North Carolina.  Operations outside of the State of North Carolina and the wholesale mortgage origination business were discontinued in February 2011, and all remaining operations were discontinued on March 17, 2011.  Dover filed for Chapter 11 bankruptcy on February 15, 2012 in the United States Bankruptcy Court for the Western District of North Carolina.  All of the assets and liabilities of Dover were written off at that time.The results of operations of a component of an entity that has been disposed of shall be reported in discontinued operations if both the operations and cash flows of the component have been, or will be, eliminated from ongoing operations of the entity as a result of the disposal transaction and the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction.  As a result, the Consolidated Balance Sheets, Statements of Operations and Statement of Cash Flows for all periods reflect retrospective application of Dover's classification as a discontinued operation.There were no assets and liabilities of discontinued operations as of March 31, 2013 and December 31, 2012.Net loss from discontinued operations, net of tax, at the dates indicated were as follows:(dollars in thousands) Three Months Ended March 31,  2013 2012Interest Income    Total interest income $— $—Interest Expense    Total interest expense — —Net Interest Income before Provision for Loan Losses — —Provision for loan losses — —Net Interest Income after Provision for Loan Losses — —Noninterest Income    Total noninterest income — —Noninterest Expense    Personnel expense — 1Net occupancy expense — 1Professional fees — 25Total noninterest expense — 27Loss before income taxes — (27)Income tax (benefit)/expense — —Net loss from discontinued operations, net of tax $— $(27)All financial information in the consolidated financial statements and notes to the consolidated financial statements reflects continuing operations, unless otherwise noted. |

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| - Definition
The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).
+ References
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