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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 |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 36,271 |  | $ 29,307
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 45,957 |  | 37,565
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 25,544 |  | 21,537
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 25,954 |  | 24,270
Related allowance | 13,395 |  | 7,045
Recorded investment | 61,815 |  | 50,844
Unpaid principal balance | 71,911 |  | 61,835
Average recorded investment | 18,053 | $ 13,141 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 36,177 | 37,787 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 282 | 116 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 33 | 32 |
Impaired Financing Receivable, Average Recorded Investment | 54,230 | 50,928 |
Interest Income Recognized | 315 | 148 |
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 18,120 |  | 11,344
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 23,975 |  | 15,673
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 24,526 |  | 20,132
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 24,701 |  | 22,590
Related allowance | 12,900 |  | 6,952
Average recorded investment | 17,027 | 10,917 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 17,298 | 19,375 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 152 | 57 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 28 | 28 |
Real estate construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 28
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 117
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0
Related allowance | 0 |  | 0
Average recorded investment | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 17 | 239 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 44 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 0 |
Residential real estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,848 |  | 9,952
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 12,893 |  | 11,819
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 496 |  | 461
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 728 |  | 672
Related allowance | 75 |  | 51
Average recorded investment | 497 | 901 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 10,724 | 10,155 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 47 | 38 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 0 | 3 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 6,805 |  | 7,562
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,474 |  | 9,449
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 522 |  | 944
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 525 |  | 1,008
Related allowance | 420 |  | 42
Average recorded investment | 529 | 1,323 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 7,658 | 7,711 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 38 | 20 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 5 | 1 |
Loans to individuals [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 498 |  | 421
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 615 |  | 507
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0
Related allowance | 0 |  | $ 0
Average recorded investment | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 480 | 307 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1 | 1 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | $ 0 | $ 0 |

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