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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 | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 43,905 |  | $ 43,905 |  | $ 58,014
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 50,433 |  | 50,433 |  | 88,596
Recorded investment | 71,219 |  | 71,219 |  | 107,555
Unpaid principal balance | 82,042 |  | 82,042 |  | 139,687
Related allowance | 8,239 |  | 8,239 |  | 17,778
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 27,314 |  | 27,314 |  | 49,541
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 31,609 |  | 31,609 |  | 51,091
Average recorded investment | 20,631 | 41,201 | 26,029 | 32,651 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 35 | 19 | 106 | 36 |
Impaired Financing Receivable, Average Recorded Investment | 70,627 | 87,099 | 81,915 | 84,055 |
Interest Income Recognized | 171 | 133 | 504 | 219 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 49,996 | 45,898 | 55,886 | 51,404 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 136 | 114 | 398 | 183 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,209 |  | 10,209 |  | 8,080
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,137 |  | 11,137 |  | 8,983
Related allowance | 4,889 |  | 4,889 |  | 10,331
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 16,530 |  | 16,530 |  | 26,532
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 17,064 |  | 17,064 |  | 27,412
Average recorded investment | 10,370 | 25,469 | 15,552 | 21,025 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 16 | 2 | 46 | 5 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 14,000 | 6,664 | 14,482 | 9,281 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 41 | 94 | 147 | 116 |
Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,251 |  | 2,251 |  | 8,491
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,795 |  | 5,795 |  | 35,555
Related allowance | 165 |  | 165 |  | 300
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,866 |  | 1,866 |  | 2,756
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,181 |  | 2,181 |  | 3,087
Average recorded investment | 1,541 | 8,848 | 1,848 | 7,381 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 8 | 0 | 35 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,340 | 4,954 | 5,390 | 6,641 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 257 |  | 257 |  | 256
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 272 |  | 272 |  | 256
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Average recorded investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 251 | 28 | 248 | 9 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1 | 0 | 3 | 0 |
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 9,493 |  | 9,493 |  | 7,928
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,118 |  | 10,118 |  | 8,401
Related allowance | 1,377 |  | 1,377 |  | 780
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 3,406 |  | 3,406 |  | 2,695
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 3,440 |  | 3,440 |  | 2,696
Average recorded investment | 3,349 | 2,130 | 3,001 | 1,532 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 10 | 6 | 24 | 20 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 9,977 | 4,374 | 9,376 | 7,604 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 52 | 6 | 129 | 17 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 21,695 |  | 21,695 |  | 33,259
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 23,111 |  | 23,111 |  | 35,401
Related allowance | 1,808 |  | 1,808 |  | 6,367
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 5,512 |  | 5,512 |  | 17,558
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 8,924 |  | 8,924 |  | 17,896
Average recorded investment | 5,371 | 4,754 | 5,628 | 2,713 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1 | 11 | 1 | 11 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 23,428 | 29,878 | 26,390 | 27,869 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | $ 42 | $ 14 | $ 119 | $ 50 |

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