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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Contract | Dec. 31, 2014 USD ($) Contract | Dec. 31, 2013 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 61 | 77 | 82
Extend Maturity | $ 1,754 | $ 5,487 | $ 4,390
Modify Rate | 3,658 | 732 | 2,018
Modify Payments | 6,440 | 16,381 | 3,971
Others |  | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 11,852 | 22,600 | 10,379
Post-Modification Outstanding Recorded Investment | 10,956 | 15,967 | 7,713
Specific Reserve | $ 1,332 | $ 4,665 | $ 1,101
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 12 | 9 | 14
Extend Maturity | $ 1,751 | $ 5,487 | $ 3,462
Modify Rate | 3,195 | 0 | 0
Modify Payments | 4,527 | 14,529 | 1,677
Others |  | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 9,473 | 20,016 | 5,139
Post-Modification Outstanding Recorded Investment | 8,823 | 13,785 | 3,104
Specific Reserve | $ 1,330 | $ 4,665 | $ 906
Residential real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 32 | 52 | 46
Extend Maturity | $ 0 | $ 0 | $ 347
Modify Rate | 296 | 629 | 418
Modify Payments | 1,414 | 1,797 | 2,116
Others |  | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 1,710 | 2,426 | 2,881
Post-Modification Outstanding Recorded Investment | 1,575 | 2,062 | 2,316
Specific Reserve | $ 2 | $ 0 | $ 161
Commercial real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 1 | 1 | 5
Extend Maturity | $ 0 | $ 0 | $ 571
Modify Rate | 0 | 0 | 1,499
Modify Payments | 464 | 8 | 145
Others |  | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 464 | 8 | 2,215
Post-Modification Outstanding Recorded Investment | 389 | 6 | 2,184
Specific Reserve | $ 0 | $ 0 | $ 34
Loans to individuals [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 16 | 15 | 17
Extend Maturity | $ 3 | $ 0 | $ 10
Modify Rate | 167 | 103 | 101
Modify Payments | 35 | 47 | 33
Others |  | 0 | 0
Total Pre-Modification Outstanding Recorded Investment | 205 | 150 | 144
Post-Modification Outstanding Recorded Investment | 169 | 114 | 109
Specific Reserve | $ 0 | $ 0 | $ 0

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