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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, 2021 USD ($) Contract | Jun. 30, 2020 USD ($) Contract | Jun. 30, 2021 USD ($) Contract | Jun. 30, 2020 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 7 | 5 | 14 | 16
Total Pre-Modification Outstanding Recorded Investment | $ 6,797 | $ 200 | $ 13,353 | $ 471
Post- Modification Outstanding Recorded Investment | 4,114 | 197 | 10,539 | 451
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 0 | $ 1,091 | $ 0
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 1 |  | 3 |
Total Pre-Modification Outstanding Recorded Investment | $ 6,596 |  | $ 12,969 |
Post- Modification Outstanding Recorded Investment | 3,916 |  | 10,167 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 1,091 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 4 |  | 7 | 4
Total Pre-Modification Outstanding Recorded Investment | $ 172 |  | $ 291 | $ 264
Post- Modification Outstanding Recorded Investment | 169 |  | 287 | 256
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 0 | $ 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  |  | 4 | 10
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 93 | $ 195
Post- Modification Outstanding Recorded Investment |  |  | 85 | 186
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 |  |  |  | $ 12
Post- Modification Outstanding Recorded Investment |  |  |  | 9
Troubled Debt Restructuring [Policy Text Block] |  |  |  | 0
Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 1 |  | 3 |
Total Pre-Modification Outstanding Recorded Investment | $ 6,596 |  | $ 12,969 |
Post- Modification Outstanding Recorded Investment | 3,916 |  | 10,167 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | $ 1,091 |
Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 4 |  | 6 |
Total Pre-Modification Outstanding Recorded Investment | $ 172 |  | $ 277 |
Post- Modification Outstanding Recorded Investment | 169 |  | 274 |
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 |  |  | 1 |
Total Pre-Modification Outstanding Recorded Investment |  |  | $ 14 |
Post- Modification Outstanding Recorded Investment |  |  | 13 |
Troubled Debt Restructuring [Policy Text Block] |  |  | $ 0 |
Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 |  | 4 |
Total Pre-Modification Outstanding Recorded Investment | $ 29 |  | $ 93 |
Post- Modification Outstanding Recorded Investment | 29 |  | 85 |
Troubled Debt Restructuring [Policy Text Block] | $ 0 |  | 0 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  | 2 |  |
Total Pre-Modification Outstanding Recorded Investment |  | $ 146 |  |
Post- Modification Outstanding Recorded Investment |  | 142 |  |
Troubled Debt Restructuring [Policy Text Block] |  | $ 0 |  |
Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 2 | 3 |  |
Total Pre-Modification Outstanding Recorded Investment | $ 29 | $ 54 |  |
Post- Modification Outstanding Recorded Investment | 29 | 55 |  |
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 | 6,373 | 0
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 6,373 |
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
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 |  | 6,373 |
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 |
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 |  |
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 29 | 53 | 198 | 71
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 | 0 |  | 105 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 93 | 71
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  |  | 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 | 0 |  | 105 |
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 |
Contractual Interest Rate Reduction [Member] | Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 29 |  | 93 |
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 |  |
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 29 | 53 |  |
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 6,768 | 147 | 6,782 | 400
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 6,596 |  | 6,596 |
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 172 |  | 186 | 264
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 0 | 124
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  |  | $ 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 | 6,596 |  | 6,596 |
Contractual Payment Modification [Member] | Senior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 172 |  | 172 |
Contractual Payment Modification [Member] | Junior Lien | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  |  | 14 |
Contractual Payment Modification [Member] | Automobiles | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | $ 0 |
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 146 |  |
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 0 | $ 1 |  |

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