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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) Contract | Mar. 31, 2020 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 7 | 12
Total Pre-Modification Outstanding Recorded Investment | $ 6,556 | $ 277
Post- Modification Outstanding Recorded Investment | 6,519 | 273
Troubled Debt Restructuring [Policy Text Block] | $ 1,190 | $ 0
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 2 |
Total Pre-Modification Outstanding Recorded Investment | $ 6,373 |
Post- Modification Outstanding Recorded Investment | 6,339 |
Troubled Debt Restructuring [Policy Text Block] | $ 1,190 |
Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 3 | 2
Total Pre-Modification Outstanding Recorded Investment | $ 119 | $ 118
Post- Modification Outstanding Recorded Investment | 119 | 117
Troubled Debt Restructuring [Policy Text Block] | $ 0 | $ 0
Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 2 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 64 | $ 147
Post- Modification Outstanding Recorded Investment | 61 | 144
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 |  | 12
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 | 2 |
Total Pre-Modification Outstanding Recorded Investment | $ 6,373 |
Post- Modification Outstanding Recorded Investment | 6,339 |
Troubled Debt Restructuring [Policy Text Block] | $ 1,190 |
Senior Lien | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 2 |
Total Pre-Modification Outstanding Recorded Investment | $ 105 |
Post- Modification Outstanding Recorded Investment | 106 |
Troubled Debt Restructuring [Policy Text Block] | $ 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 |
Total Pre-Modification Outstanding Recorded Investment | $ 64 |
Post- Modification Outstanding Recorded Investment | 61 |
Troubled Debt Restructuring [Policy Text Block] | 0 |
Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 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 | 6,373 |
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 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 | 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 |
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 |
Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 169 | 18
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 |
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 105 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 64 | 18
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 |
Contractual Interest Rate Reduction [Member] | Senior Lien | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 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 | 64 |
Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 14 | 259
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |
Contractual Payment Modification [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 14 | 118
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 129
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 | 0 |
Contractual Payment Modification [Member] | Senior Lien | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |
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 |

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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 http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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