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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, 2022 USD ($) | Jun. 30, 2021 USD ($) Contract | Jun. 30, 2022 USD ($) Contract | Jun. 30, 2021 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract |  | 7 | 2 | 14
Total Pre-Modification Outstanding Recorded Investment | $ 0 | $ 6,797 | $ 69 | $ 13,353
Post- Modification Outstanding Recorded Investment |  | 4,114 | 68 | 10,539
Troubled Debt Restructuring [Policy Text Block] |  | $ 0 | $ 0 | $ 1,091
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 | 2 | 7
Total Pre-Modification Outstanding Recorded Investment |  | $ 172 | $ 69 | $ 291
Post- Modification Outstanding Recorded Investment |  | 169 | 68 | 287
Troubled Debt Restructuring [Policy Text Block] |  | $ 0 | $ 0 | $ 0
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
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 | 2 | 6
Total Pre-Modification Outstanding Recorded Investment |  | $ 172 | $ 69 | $ 277
Post- Modification Outstanding Recorded Investment |  | 169 | 68 | 274
Troubled Debt Restructuring [Policy Text Block] |  | $ 0 | 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
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 | 0 | 6,373
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] | 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 | 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
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 29 | 10 | 198
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 | 10 | 105
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 29 |  | 93
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 | 10 | 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 Payment Modification [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 6,768 | 59 | 6,782
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 | 59 | 186
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment |  | 0 |  | 0
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 | $ 59 | 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

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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