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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) Contract | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2019 USD ($) Contract | Jun. 30, 2018 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 10 | 19 | 20 | 35
Total Pre-Modification Outstanding Recorded Investment | $ 6,233 | $ 13,066 | $ 7,164 | $ 21,274
Post- Modification Outstanding Recorded Investment | 5,964 | 12,967 | 6,869 | 16,690
Troubled Debt Restructuring [Policy Text Block] | $ 969 | $ 3,714 | $ 1,006 | $ 4,301
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 0 | 7 | 1 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 0 | $ 11,679 | $ 61 | $ 16,389
Post- Modification Outstanding Recorded Investment | 0 | 11,591 | 62 | 11,972
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 3,714 | $ 0 | $ 4,095
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 5 | 6 | 11 | 17
Total Pre-Modification Outstanding Recorded Investment | $ 341 | $ 383 | $ 922 | $ 824
Post- Modification Outstanding Recorded Investment | 337 | 381 | 897 | 779
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 0 | $ 37 | $ 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 | 2 | 3 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 5,878 | $ 966 | $ 6,119 | $ 3,983
Post- Modification Outstanding Recorded Investment | 5,613 | 960 | 5,854 | 3,870
Troubled Debt Restructuring [Policy Text Block] | $ 969 | $ 0 | $ 969 | $ 206
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 3 | 4 | 5 | 7
Total Pre-Modification Outstanding Recorded Investment | $ 14 | $ 38 | $ 62 | $ 78
Post- Modification Outstanding Recorded Investment | 14 | 35 | 56 | 69
Troubled Debt Restructuring [Policy Text Block] | $ 0 | 0 | $ 0 | 0
Real estate construction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 0 |  | 0 |
Total Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Post- Modification Outstanding Recorded Investment | 0 |  | 0 |
Troubled Debt Restructuring [Policy Text Block] | 0 |  | 0 |
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 17 | 7,747
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 4,710
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 17 | 20
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 3,017
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Extended Maturity [Member] | Real estate construction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 68 | 24 | 117 | 127
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 68 | 0 | 117 | 75
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 24 | 0 | 52
Contractual Interest Rate Reduction [Member] | Real estate construction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 6,165 | 13,042 | 7,030 | 13,400
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 11,679 | 61 | 11,679
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 273 | 383 | 788 | 729
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 5,878 | 966 | 6,119 | 966
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 14 | $ 14 | 62 | $ 26
Contractual Payment Modification [Member] | Real estate construction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |

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