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Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | $ 68,444 | $ 143,575 |  | $ 116,717
Transfer of loans at fair value |  | 219 |  |
Transfer of allowance to held for sale |  | 13,100 | [1] |
Charge-offs | 61,268 | 133,882 |  | 66,314
Recoveries | 12,942 | 8,798 |  | 6,092
Net Charge-offs | 48,326 | 125,084 |  | 60,222
Provision | 35,419 | 63,272 |  | 87,080
Ending balance | 55,537 | 68,444 |  | 143,575
Commercial, financial and agricultural |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 16,950 | 11,555 |  |
Transfer of loans at fair value |  | 2 |  |
Transfer of allowance to held for sale |  | 1,184 | [1] |
Charge-offs | 26,847 | 18,350 |  | 8,484
Recoveries | 1,066 | 1,402 |  | 1,237
Net Charge-offs | 25,781 | 16,948 |  |
Provision | 24,466 | 23,529 |  |
Ending balance | 15,635 | 16,950 |  | 11,555
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 15,539 | 24,369 |  |
Transfer of loans at fair value |  | 150 |  |
Transfer of allowance to held for sale |  | 4,327 | [1] |
Charge-offs | 10,454 | 23,063 |  | 7,748
Recoveries | 783 | 1,825 |  | 850
Net Charge-offs | 9,671 | 21,238 |  |
Provision | 5,868 | 16,885 |  |
Ending balance | 11,736 | 15,539 |  | 24,369
Construction real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 14,433 | 70,462 |  |
Transfer of loans at fair value |  | 63 |  |
Transfer of allowance to held for sale |  | 1,998 | [1] |
Charge-offs | 9,985 | 64,166 |  | 23,308
Recoveries | 2,979 | 1,463 |  | 813
Net Charge-offs | 7,006 | 62,703 |  |
Provision | (586) | 8,735 |  |
Ending balance | 6,841 | 14,433 |  | 70,462
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 15,692 | 30,259 |  |
Transfer of loans at fair value |  | 4 |  |
Transfer of allowance to held for sale |  | 5,450 | [1] |
Charge-offs | 8,607 | 20,691 |  | 18,401
Recoveries | 5,559 | 1,719 |  | 1,429
Net Charge-offs | 3,048 | 18,972 |  |
Provision | 2,115 | 9,859 |  |
Ending balance | 14,759 | 15,692 |  | 30,259
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 5,830 | 6,925 |  |
Transfer of loans at fair value |  | 0 |  |
Transfer of allowance to held for sale |  | 141 | [1] |
Charge-offs | 5,375 | 7,612 |  | 8,373
Recoveries | 2,555 | 2,385 |  | 1,763
Net Charge-offs | 2,820 | 5,227 |  |
Provision | 3,556 | 4,273 |  |
Ending balance | 6,566 | 5,830 |  | 6,925
Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance | 0 | 5 |  |
Transfer of loans at fair value |  | 0 |  |
Transfer of allowance to held for sale |  | 0 | [1] |
Charge-offs | 0 | 0 |  | 0
Recoveries | 0 | 4 |  | 0
Net Charge-offs | 0 | (4) |  |
Provision | 0 | (9) |  |
Ending balance | $ 0 | $ 0 |  | $ 5
[1] | Transfer of allowance to held for sale was allocated on a pro-rata basis based on the outstanding balance of the loans held for sale.

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- Definition Allowance For Credit Losses Transfer Of Loans At Fair Value + References No definition available. + Details
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- Definition Financing Receivables Allowance For Credit Losses Net Charge Offs + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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