| **Acquisition of Bank of Granite Corporation (Pro Forma Information) (Details) (Granite Corp. [Member], USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| Granite Corp. [Member]                                                                                                                                   |           |            |
| **Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]**                                                                    |           |            |
| Revenue                                                                                                                                                  | $ 7,868        | $ 133,312       |
| Earnings (Loss)                                                                                                                                          | $ 2,988        | $ (123,343)     |

| X                                                                                                                                                                                                         |
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| - Definition
The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463
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