| **Other Real Estate Owned and Property Acquired in Settlement of Loans** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Repossessed Assets [Abstract]**                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Other Real Estate Owned and Property Acquired in Settlement of Loans     | Other Real Estate Owned and Property Acquired in Settlement of LoansOREO represents properties acquired through foreclosure or deed in lieu thereof. The property is classified as held for sale. The property is initially carried at fair value based on recent appraisals, less estimated costs to sell. Declines in the fair value of properties included in other real estate below carrying value are recognized by a charge to income.Total OREO and foreclosed assets decreased $47.3 million from $110.4 million at December 31, 2011, to $63.1 million at December 31, 2012, which represents 44.3% of total nonperforming assets. At December 31, 2011, OREO and foreclosed assets represented 51.0% of total nonperforming assets.The following table summarizes real estate acquired in settlement of loans and personal property acquired in settlement of loans, the latter of which is included within the other assets financial statement line item on the Consolidated Balance Sheet at the dates indicated. (dollars in thousands) December 31, 2012 December 31, 2011Real estate acquired in settlement of loans $62,796 $110,009Personal property acquired in settlement of loans 335 377Total property acquired in settlement of loans $63,131 $110,386The following table summarizes the changes in real estate acquired in settlement of loans at the periods indicated.   For Twelve Months Ended(dollars in thousands) December 31, 2012 December 31, 2011Real estate acquired in settlement of loans, beginning of period $110,009 $62,058Plus: New real estate acquired in settlement of loans 32,565 132,546Plus: Real estate acquired in BOGC acquisition — 18,436Less: Sales of real estate acquired in settlement of loans (57,991) (58,782)Less: Write-downs and net loss on sales charged to expense (21,787) (44,249)Real estate acquired in settlement of loans, end of period $62,796 $110,009`At December 31, 2012, 35 assets with a net carrying amount of $22.0 million were under contract for sale and are primarily expected to close in the first quarter of 2013. Estimated losses with these sales have been recognized in the Consolidated Statements of Operations for 2012. At December 31, 2011, 25 assets with a net carrying amount of $21.3 million were under contract for sale and closed in the first quarter of 2012. Estimated losses with these sales have been recognized in the Consolidated Statements of Operations for 2011. |

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| - Definition
The entire disclosure for real estate owned (as defined). Generally, the largest component of real estate owned by lenders is assets taken in settlement of troubled loans through surrender or foreclosure. Real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 4 -Article 9Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=16397438&loc=d3e1424-110224Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4437-111522Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6905009&loc=d3e18551-111553Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 2, 6, 9-11, 18, 20 -IssueDate 2006-05-01 -Chapter 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 10 -Subparagraph a, b -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy.  It will be removed from future versions of this taxonomy.Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 15 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 11 -Article 9Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 11 -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy.  It will be removed from future versions of this taxonomy.Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5
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