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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, 2021 USD ($) Contract | Sep. 30, 2020 USD ($) Contract | Sep. 30, 2021 USD ($) Contract | Sep. 30, 2020 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 15 | 17 | 28 | 33
Total Pre-Modification Outstanding Recorded Investment | $ 1,160 | $ 1,309 | $ 8,140 | $ 1,781
Post- Modification Outstanding Recorded Investment | 1,144 | 1,165 | 4,191 | 1,607
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 489 | $ 0 | $ 489
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 5 |  | 6 |
Total Pre-Modification Outstanding Recorded Investment | $ 206 |  | $ 6,803 |
Post- Modification Outstanding Recorded Investment | 202 |  | 2,895 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 5 |  | 13 | 16
Total Pre-Modification Outstanding Recorded Investment | $ 230 |  | $ 520 | $ 877
Post- Modification Outstanding Recorded Investment | 221 |  | 500 | 729
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 | $ 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  |  | 7 | 14
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 173 | $ 263
Post- Modification Outstanding Recorded Investment |  |  | 151 | 245
Troubled Debt Restructuring [Policy Text Block] |  |  | $ 0 | $ 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 |  |  | 2
Total Pre-Modification Outstanding Recorded Investment | $ 644 |  |  | $ 12
Post- Modification Outstanding Recorded Investment | 645 |  |  | 8
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  |  | $ 0
Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 5 |  | 6 |
Total Pre-Modification Outstanding Recorded Investment | $ 206 |  | $ 6,803 |
Post- Modification Outstanding Recorded Investment | 202 |  | 2,895 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 |
Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 3 |  | 10 |
Total Pre-Modification Outstanding Recorded Investment | $ 113 |  | $ 390 |
Post- Modification Outstanding Recorded Investment | 109 |  | 375 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 |
Junior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 |  | 3 |
Total Pre-Modification Outstanding Recorded Investment | $ 117 |  | $ 130 |
Post- Modification Outstanding Recorded Investment | 112 |  | 125 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 |
Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 3 |  | 7 |
Total Pre-Modification Outstanding Recorded Investment | $ 80 |  | $ 173 |
Post- Modification Outstanding Recorded Investment | 76 |  | 151 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  | 12 |  |
Total Pre-Modification Outstanding Recorded Investment |  | $ 613 |  |
Post- Modification Outstanding Recorded Investment |  | 477 |  |
Troubled Debt Restructuring [Policy Text Block] |  | $ 0 |  |
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 3 | 4 |  |
Total Pre-Modification Outstanding Recorded Investment | $ 80 | $ 67 |  |
Post- Modification Outstanding Recorded Investment | 76 | 63 |  |
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 0 |  |
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  | 1 |  | 1
Total Pre-Modification Outstanding Recorded Investment |  | $ 629 |  | $ 629
Post- Modification Outstanding Recorded Investment |  | 625 |  | 625
Troubled Debt Restructuring [Policy Text Block] |  | 489 |  | 489
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 |  | 2 |
Total Pre-Modification Outstanding Recorded Investment | $ 644 |  | $ 644 |
Post- Modification Outstanding Recorded Investment | 645 |  | 645 |
Troubled Debt Restructuring [Policy Text Block] | 0 |  | $ 0 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  |  | 2 |
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 644 |
Post- Modification Outstanding Recorded Investment |  |  | 645 |
Troubled Debt Restructuring [Policy Text Block] |  |  | 0 |
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 | 0
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  |  | 0
Extended Maturity [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Junior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 |  |
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 |  |
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 |  | 0
Extended Maturity [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 |
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 130 | 705 | 329 | 776
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 |
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 113 |  | 219 | 33
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 110 | 114
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  |  | 0
Contractual Interest Rate Reduction [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Contractual Interest Rate Reduction [Member] | Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 113 |  | 219 |
Contractual Interest Rate Reduction [Member] | Junior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Contractual Interest Rate Reduction [Member] | Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 17 |  | 110 |
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 33 |  |
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 17 | 43 |  |
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 629 |  | 629
Contractual Interest Rate Reduction [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 |
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 1,030 | 604 | 7,811 | 1,005
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 206 |  | 6,803 |
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 117 |  | 301 | 844
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 63 | 149
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 644 |  |  | 12
Contractual Payment Modification [Member] | Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 206 |  | 6,803 |
Contractual Payment Modification [Member] | Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 171 |
Contractual Payment Modification [Member] | Junior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 117 |  | 130 |
Contractual Payment Modification [Member] | Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 63 |  | 63 |
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 580 |  |
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 63 | 24 |  |
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | $ 0 |  | $ 0
Contractual Payment Modification [Member] | Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 644 |  | 644 |
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 644 |

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