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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 |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 29,483 |  | $ 33,466
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 33,203 |  | 39,291
Recorded investment | 56,203 |  | 59,383
Unpaid principal balance | 62,292 |  | 66,307
Related allowance | 10,503 |  | 8,824
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 26,720 |  | 25,917
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 29,089 |  | 27,016
Average recorded investment | 21,755 | 37,649 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 54 | 61 |
Impaired Financing Receivable, Average Recorded Investment | 54,740 | 96,859 |
Interest Income Recognized | 166 | 161 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 32,985 | 59,210 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 112 | 100 |
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 9,788 |  | 6,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,960 |  | 7,649
Related allowance | 9,886 |  | 7,364
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 22,940 |  | 21,482
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 23,559 |  | 22,082
Average recorded investment | 17,649 | 25,803 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 45 | 19 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,953 | 8,592 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 17 | 51 |
Real estate construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,213 |  | 3,486
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,782 |  | 6,664
Related allowance | 74 |  | 94
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 638 |  | 414
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,780 |  | 737
Average recorded investment | 638 | 2,685 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 13 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,438 | 7,877 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 12 | 0 |
Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 270 |  | 289
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 297 |  | 307
Related allowance | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0
Average recorded investment | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 271 | 247 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1 | 1 |
Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 9,864 |  | 9,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,741 |  | 9,952
Related allowance | 496 |  | 1,282
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,841 |  | 3,533
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 3,435 |  | 3,585
Average recorded investment | 3,161 | 2,457 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 8 | 4 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 9,825 | 8,516 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 49 | 37 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 7,348 |  | 13,606
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,423 |  | 14,719
Related allowance | 47 |  | 84
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 301 |  | 488
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 315 |  | 612
Average recorded investment | 307 | 6,704 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1 | 25 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 9,498 | 33,978 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | $ 33 | $ 11 |

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