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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 107,555 | $ 98,752 |
Unpaid Principal Balance | 139,687 | 130,627 |
Related Allowance | 17,778 | 13,236 |
Average Recorded Investment | 87,979 | 139,922 | 140,737
Interest Income Recognized | 369 | 1,393 | 30
Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 8,080 | 2,010 |
Unpaid Principal Balance | 8,983 | 3,418 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 9,217 | 3,887 | 6,051
Interest Income Recognized | 173 | 20 | 0
Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 8,491 | 10,814 |
Unpaid Principal Balance | 35,555 | 20,161 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 11,912 | 23,254 | 35,898
Interest Income Recognized | 0 | 10 | 0
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 7,928 | 3,125 |
Unpaid Principal Balance | 8,401 | 3,513 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 8,114 | 2,702 | 3,165
Interest Income Recognized | 72 | 9 | 0
Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 33,259 | 36,777 |
Unpaid Principal Balance | 35,401 | 41,974 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 28,574 | 35,817 | 24,198
Interest Income Recognized | 66 | 799 | 12
Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 256 | 0 |
Unpaid Principal Balance | 256 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 103 | 10 | 58
Interest Income Recognized | 2 | 0 | 0
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 58,014 | 52,726 |
Unpaid Principal Balance | 88,596 | 69,066 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 57,920 | 65,670 | 69,370
Interest Income Recognized | 313 | 838 | 12
Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 26,532 | 34,056 |
Unpaid Principal Balance | 27,412 | 34,341 |
Related Allowance | 10,331 | 9,069 |
Average Recorded Investment | 21,979 | 30,456 | 43,778
Interest Income Recognized | 9 | 152 | 14
Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,756 | 6,298 |
Unpaid Principal Balance | 3,087 | 21,402 |
Related Allowance | 300 | 2,960 |
Average Recorded Investment | 1,457 | 14,465 | 16,641
Interest Income Recognized | 0 | 0 | 0
Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,695 | 955 |
Unpaid Principal Balance | 2,696 | 955 |
Related Allowance | 780 | 93 |
Average Recorded Investment | 1,599 | 615 | 237
Interest Income Recognized | 15 | 7 | 0
Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 17,558 | 4,717 |
Unpaid Principal Balance | 17,896 | 4,863 |
Related Allowance | 6,367 | 1,114 |
Average Recorded Investment | 5,024 | 28,716 | 10,711
Interest Income Recognized | 32 | 396 | 4
Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 49,541 | 46,026 |
Unpaid Principal Balance | 51,091 | 61,561 |
Related Allowance | 17,778 | 13,236 |
Average Recorded Investment | 30,059 | 74,252 | 71,367
Interest Income Recognized | $ 56 | $ 555 | $ 18

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