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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 | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 34,424 |  | $ 34,424 |  | $ 29,307
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 45,540 |  | 45,540 |  | 37,565
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 29,984 |  | 29,984 |  | 21,537
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 32,468 |  | 32,468 |  | 24,270
Related allowance | 15,530 |  | 15,530 |  | 7,045
Recorded investment | 64,408 |  | 64,408 |  | 50,844
Unpaid principal balance | 78,008 |  | 78,008 |  | 61,835
Average recorded investment | 24,185 | $ 5,759 | 19,147 | $ 5,850 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 37,749 | 38,862 | 38,935 | 41,925 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 216 | 135 | 500 | 251 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 71 | 43 | 102 | 75 |
Impaired Financing Receivable, Average Recorded Investment | 61,934 | 44,621 | 58,082 | 47,775 |
Interest Income Recognized | 287 | 178 | 602 | 326 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 16,078 |  | 16,078 |  | 11,344
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 23,373 |  | 23,373 |  | 15,673
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 28,522 |  | 28,522 |  | 20,132
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 30,849 |  | 30,849 |  | 22,590
Related allowance | 15,018 |  | 15,018 |  | 6,952
Average recorded investment | 22,788 | 5,237 | 17,939 | 5,337 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 18,995 | 18,526 | 20,116 | 21,691 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 95 | 65 | 249 | 120 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 65 | 42 | 91 | 72 |
Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 28
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 117
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 | 0 | 36 | 9 | 137 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 0 | 0 | 44 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 11,580 |  | 11,580 |  | 9,952
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 13,674 |  | 13,674 |  | 11,819
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 551 |  | 551 |  | 461
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 680 |  | 680 |  | 672
Related allowance | 48 |  | 48 |  | 51
Average recorded investment | 476 | 329 | 347 | 319 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 11,462 | 11,302 | 11,232 | 11,025 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 90 | 45 | 137 | 86 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 6,390 |  | 6,390 |  | 7,562
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,043 |  | 8,043 |  | 9,449
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 911 |  | 911 |  | 944
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 939 |  | 939 |  | 1,008
Related allowance | 464 |  | 464 |  | 42
Average recorded investment | 921 | 193 | 861 | 194 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6,887 | 8,682 | 7,136 | 8,760 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 29 | 24 | 67 | 43 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 6 | 1 | 11 | 3 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 376 |  | 376 |  | 421
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 450 |  | 450 |  | 507
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 | 405 | 316 | 442 | 312 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 2 | 1 | 3 | 2 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | $ 0 | $ 0 | $ 0 | $ 0 |

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