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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