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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) Contract | Dec. 31, 2021 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 30
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 9,370
Financing Receivable, Troubled Debt Restructuring | 676 | 1,690
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | 0
Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 683 | 8,901
Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 10 | 469
Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 0 | $ 0
Commercial Loan [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 6
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 7,893
Financing Receivable, Troubled Debt Restructuring |  | 288
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0
Commercial Loan [Member] | Time and demand loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 6
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 7,893
Financing Receivable, Troubled Debt Restructuring |  | 288
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0
Commercial Loan [Member] | Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 7,893
Commercial Loan [Member] | Contractual Payment Modification [Member] | Time and demand loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 7,893
Commercial Loan [Member] | Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Loan [Member] | Contractual Interest Rate Reduction [Member] | Time and demand loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Loan [Member] | Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Loan [Member] | Extended Maturity [Member] | Time and demand loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0
Residential Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 15
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 660
Financing Receivable, Troubled Debt Restructuring | 676 | 624
Financing Receivable Troubled Debt Restructuring Specific Reserve | $ 0 | $ 0
Residential Real Estate [Member] | Senior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 12
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 530
Financing Receivable, Troubled Debt Restructuring | 676 | 502
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | $ 0
Residential Real Estate [Member] | Junior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 3
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 130
Financing Receivable, Troubled Debt Restructuring |  | 122
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0
Residential Real Estate [Member] | Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 683 | 301
Residential Real Estate [Member] | Contractual Payment Modification [Member] | Senior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 683 | 171
Residential Real Estate [Member] | Contractual Payment Modification [Member] | Junior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 130
Residential Real Estate [Member] | Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 10 | 359
Residential Real Estate [Member] | Contractual Interest Rate Reduction [Member] | Senior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 10 | 359
Residential Real Estate [Member] | Contractual Interest Rate Reduction [Member] | Junior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Residential Real Estate [Member] | Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 0 | 0
Residential Real Estate [Member] | Extended Maturity [Member] | Senior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 0 | 0
Residential Real Estate [Member] | Extended Maturity [Member] | Junior Lien |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0
Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 2
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 644
Financing Receivable, Troubled Debt Restructuring |  | 634
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 2
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 644
Financing Receivable, Troubled Debt Restructuring |  | 634
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0
Commercial Real Estate [Member] | Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 644
Commercial Real Estate [Member] | Contractual Payment Modification [Member] | Nonowner Occupied Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 644
Commercial Real Estate [Member] | Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Real Estate [Member] | Contractual Interest Rate Reduction [Member] | Nonowner Occupied Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Real Estate [Member] | Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Commercial Real Estate [Member] | Extended Maturity [Member] | Nonowner Occupied Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0
Loans To Individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 7
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 173
Financing Receivable, Troubled Debt Restructuring |  | 144
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0
Loans To Individuals [Member] | Automobiles |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 7
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 173
Financing Receivable, Troubled Debt Restructuring |  | 144
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0
Loans To Individuals [Member] | Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 63
Loans To Individuals [Member] | Contractual Payment Modification [Member] | Automobiles |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 63
Loans To Individuals [Member] | Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 110
Loans To Individuals [Member] | Contractual Interest Rate Reduction [Member] | Automobiles |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 110
Loans To Individuals [Member] | Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0
Loans To Individuals [Member] | Extended Maturity [Member] | Automobiles |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
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