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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Contract | Dec. 31, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 58 | 41 | 65
Extend Maturity | $ 316 | $ 7,081 | $ 1,521
Modify Rate | 330 | 2,095 | 6,614
Modify Payments | 10,635 | 1,878 | 6,523
Total Pre-Modification Outstanding Recorded Investment | 11,281 | 11,054 | 14,658
Post-Modification Outstanding Recorded Investment | 8,829 | 8,274 | 10,275
Specific Reserve | $ 0 | $ 596 | $ 500
Commercial Financial Agricultural And Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 3 | 6 | 5
Extend Maturity | $ 74 | $ 6,768 | $ 23
Modify Rate | 0 | 1,806 | 6,318
Modify Payments | 8,250 | 987 | 3,854
Total Pre-Modification Outstanding Recorded Investment | 8,324 | 9,561 | 10,195
Post-Modification Outstanding Recorded Investment | 6,104 | 6,946 | 6,210
Specific Reserve | $ 0 | $ 566 | $ 317
Residential real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 37 | 20 | 39
Extend Maturity | $ 242 | $ 134 | $ 107
Modify Rate | 241 | 261 | 214
Modify Payments | 1,316 | 573 | 2,619
Total Pre-Modification Outstanding Recorded Investment | 1,799 | 968 | 2,940
Post-Modification Outstanding Recorded Investment | 1,638 | 851 | 2,698
Specific Reserve | $ 0 | $ 1 | $ 124
Commercial real estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 3 | 5 | 8
Extend Maturity | $ 0 | $ 179 | $ 1,368
Modify Rate | 0 | 0 | 0
Modify Payments | 1,016 | 269 | 25
Total Pre-Modification Outstanding Recorded Investment | 1,016 | 448 | 1,393
Post-Modification Outstanding Recorded Investment | 975 | 412 | 1,271
Specific Reserve | $ 0 | $ 29 | $ 59
Loans To Individuals [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | Contract | 15 | 10 | 13
Extend Maturity | $ 0 | $ 0 | $ 23
Modify Rate | 89 | 28 | 82
Modify Payments | 53 | 49 | 25
Total Pre-Modification Outstanding Recorded Investment | 142 | 77 | 130
Post-Modification Outstanding Recorded Investment | 112 | 65 | 96
Specific Reserve | $ 0 | $ 0 | $ 0

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