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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2015
USD ($)
Contract
Dec. 31, 2014
USD ($)
Contract
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 65 61 77
Extend Maturity $ 1,521 $ 1,754 $ 5,487
Modify Rate 6,614 3,658 732
Modify Payments 6,523 6,440 16,381
Total Pre-Modification Outstanding Recorded Investment 14,658 11,852 22,600
Post-Modification Outstanding Recorded Investment 10,275 10,956 15,967
Specific Reserve $ 500 $ 1,332 $ 4,665
Commercial Financial Agricultural And Other [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 5 12 9
Extend Maturity $ 23 $ 1,751 $ 5,487
Modify Rate 6,318 3,195 0
Modify Payments 3,854 4,527 14,529
Total Pre-Modification Outstanding Recorded Investment 10,195 9,473 20,016
Post-Modification Outstanding Recorded Investment 6,210 8,823 13,785
Specific Reserve $ 317 $ 1,330 $ 4,665
Residential real estate [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 39 32 52
Extend Maturity $ 107 $ 0 $ 0
Modify Rate 214 296 629
Modify Payments 2,619 1,414 1,797
Total Pre-Modification Outstanding Recorded Investment 2,940 1,710 2,426
Post-Modification Outstanding Recorded Investment 2,698 1,575 2,062
Specific Reserve $ 124 $ 2 $ 0
Commercial real estate [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 8 1 1
Extend Maturity $ 1,368 $ 0 $ 0
Modify Rate 0 0 0
Modify Payments 25 464 8
Total Pre-Modification Outstanding Recorded Investment 1,393 464 8
Post-Modification Outstanding Recorded Investment 1,271 389 6
Specific Reserve $ 59 $ 0 $ 0
Loans To Individuals [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 13 16 15
Extend Maturity $ 23 $ 3 $ 0
Modify Rate 82 167 103
Modify Payments 25 35 47
Total Pre-Modification Outstanding Recorded Investment 130 205 150
Post-Modification Outstanding Recorded Investment 96 169 114
Specific Reserve $ 0 $ 0 $ 0