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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 29,923 |  | $ 29,923 |  | $ 33,466
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 34,588 |  | 34,588 |  | 39,291
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,334 |  | 15,334 |  | 25,917
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 15,859 |  | 15,859 |  | 27,016
Related allowance | 4,632 |  | 4,632 |  | 8,824
Recorded investment | 45,257 |  | 45,257 |  | 59,383
Unpaid principal balance | 50,447 |  | 50,447 |  | 66,307
Average recorded investment | 15,634 | 20,631 | 13,212 | 26,029 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 31,077 | 49,996 | 37,078 | 55,886 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 103 | 136 | 344 | 398 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 53 | 35 | 140 | 106 |
Impaired Financing Receivable, Average Recorded Investment | 46,711 | 70,627 | 50,290 | 81,915 |
Interest Income Recognized | 156 | 171 | 484 | 504 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,833 |  | 10,833 |  | 6,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,207 |  | 12,207 |  | 7,649
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 13,802 |  | 13,802 |  | 21,482
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 14,192 |  | 14,192 |  | 22,082
Related allowance | 4,271 |  | 4,271 |  | 7,364
Average recorded investment | 14,140 | 10,370 | 11,944 | 15,552 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,973 | 14,000 | 15,209 | 14,482 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 39 | 41 | 77 | 147 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 48 | 16 | 125 | 46 |
Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 291 |  | 291 |  | 3,486
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 867 |  | 867 |  | 6,664
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 414
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 737
Related allowance | 0 |  | 0 |  | 94
Average recorded investment | 0 | 1,541 | 0 | 1,848 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 295 | 2,340 | 1,506 | 5,390 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1 | 0 | 19 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 8 | 0 | 35 |
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,093 |  | 10,093 |  | 9,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,171 |  | 11,171 |  | 9,952
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,445 |  | 1,445 |  | 3,533
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,579 |  | 1,579 |  | 3,585
Related allowance | 332 |  | 332 |  | 1,282
Average recorded investment | 1,406 | 3,349 | 1,178 | 3,001 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,590 | 9,977 | 11,047 | 9,376 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 38 | 52 | 167 | 129 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 3 | 10 | 12 | 24 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 8,358 |  | 8,358 |  | 13,606
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 9,887 |  | 9,887 |  | 14,719
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 87 |  | 87 |  | 488
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 88 |  | 88 |  | 612
Related allowance | 29 |  | 29 |  | 84
Average recorded investment | 88 | 5,371 | 90 | 5,628 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 8,873 | 23,428 | 9,007 | 26,390 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 24 | 42 | 78 | 119 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 2 | 1 | 3 | 1 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 348 |  | 348 |  | 289
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 456 |  | 456 |  | 307
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Average recorded investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 346 | 251 | 309 | 248 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1 | 1 | 3 | 3 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | $ 0 | $ 0 | $ 0 | $ 0 |

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