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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2018 USD ($) Contract | Sep. 30, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 14 | 7 | 42 | 33
Total Pre-Modification Outstanding Recorded Investment | $ 482 | $ 203 | $ 10,600 | $ 9,814
Post- Modification Outstanding Recorded Investment | $ 452 | $ 189 | $ 9,547 | $ 7,426
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 2811000 | 671000
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 1 | 3 | 6
Total Pre-Modification Outstanding Recorded Investment | $ 74 | $ 47 | $ 8,324 | $ 8,601
Post- Modification Outstanding Recorded Investment | $ 74 | $ 47 | $ 7,393 | $ 6,307
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 2811 | 669
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 7 | 4 | 24 | 15
Total Pre-Modification Outstanding Recorded Investment | $ 365 | $ 117 | $ 1,189 | $ 846
Post- Modification Outstanding Recorded Investment | $ 338 | $ 106 | $ 1,108 | $ 777
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 2
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract |  | 1 | 2 | 4
Total Pre-Modification Outstanding Recorded Investment |  | $ 27 | $ 966 | $ 290
Post- Modification Outstanding Recorded Investment |  | $ 25 | $ 943 | $ 280
Financing Receivable, Modifications, Determination of Allowance for Credit Losses |  | 0 | 0 | 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 6 | 1 | 13 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 43 | $ 12 | $ 121 | $ 77
Post- Modification Outstanding Recorded Investment | $ 40 | $ 11 | $ 103 | $ 62
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 0
Extended Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 139 | $ 0 | $ 159 | $ 7,076
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 74 | 0 | 74 | 6,768
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 65 | 0 | 85 | 129
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 | 0 | 179
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 96 | 17 | 222 | 2,007
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 1,786
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 70 | 17 | 145 | 204
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 26 | 0 | 77 | 17
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 247 | 186 | 10,219 | 731
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 47 | 8,250 | 47
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 230 | 100 | 959 | 513
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 27 | 966 | 111
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 17 | $ 12 | $ 44 | $ 60

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