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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 35,876 |  | $ 35,876 |  | $ 29,307
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 48,406 |  | 48,406 |  | 37,565
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 18,950 |  | 18,950 |  | 21,537
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 21,500 |  | 21,500 |  | 24,270
Related allowance | 8,175 |  | 8,175 |  | 7,045
Recorded investment | 54,826 |  | 54,826 |  | 50,844
Unpaid principal balance | 69,906 |  | 69,906 |  | 61,835
Average recorded investment | 17,928 | $ 8,132 | 15,945 | $ 6,483 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 43,157 | 33,203 | 43,138 | 39,145 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 302 | 110 | 847 | 362 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 29 | 30 | 95 | 104 |
Impaired Financing Receivable, Average Recorded Investment | 61,085 | 41,335 | 59,083 | 45,628 |
Interest Income Recognized | 331 | 140 | 942 | 466 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 17,948 |  | 17,948 |  | 11,344
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 27,205 |  | 27,205 |  | 15,673
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 18,238 |  | 18,238 |  | 20,132
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 20,748 |  | 20,748 |  | 22,590
Related allowance | 7,739 |  | 7,739 |  | 6,952
Average recorded investment | 17,207 | 7,700 | 15,310 | 6,125 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 24,674 | 14,215 | 24,020 | 19,199 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 128 | 40 | 421 | 161 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 22 | 29 | 77 | 100 |
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 | 32 | 6 | 102 |
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 | 11,506 |  | 11,506 |  | 9,952
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 13,513 |  | 13,513 |  | 11,819
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 175 |  | 175 |  | 461
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 215 |  | 215 |  | 672
Related allowance | 6 |  | 6 |  | 51
Average recorded investment | 174 | 351 | 111 | 275 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 11,636 | 10,748 | 11,546 | 10,987 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 94 | 39 | 232 | 118 |
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 | 6,045 |  | 6,045 |  | 7,562
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,244 |  | 7,244 |  | 9,449
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 537 |  | 537 |  | 944
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 537 |  | 537 |  | 1,008
Related allowance | 430 |  | 430 |  | 42
Average recorded investment | 547 | 81 | 524 | 83 |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6,463 | 7,894 | 7,143 | 8,545 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 73 | 26 | 140 | 69 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 7 | 1 | 18 | 4 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 377 |  | 377 |  | 421
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 444 |  | 444 |  | 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 | 384 | 314 | 423 | 312 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 7 | 5 | 10 | 14 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | $ 0 | $ 0 | $ 0 | $ 0 |

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