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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 | Dec. 31, 2020 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 30 | 41
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 9,370 | $ 14,874
Financing Receivable, Troubled Debt Restructuring | 676 | 1,690 | 13,969
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | 0 | 636
Contractual Payment Modification [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 683 | 8,901 | 14,098
Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 10 | 469 | 776
Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 0 | $ 0 | $ 0
Commercial Loan [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 6 | 4
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 7,893 | $ 2,805
Financing Receivable, Troubled Debt Restructuring |  | 288 | 2,196
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0 | $ 636
Commercial Loan [Member] | Time and demand loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 6 | 4
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 7,893 | $ 2,805
Financing Receivable, Troubled Debt Restructuring |  | 288 | 2,196
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0 | 636
Commercial Loan [Member] | Contractual Payment Modification [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 7,893 | 2,176
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 | 2,176
Commercial Loan [Member] | Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0 | 629
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 | 629
Commercial Loan [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0 | 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 | $ 0
Residential Real Estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 15 | 18
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 660 | $ 950
Financing Receivable, Troubled Debt Restructuring | 676 | 624 | 791
Financing Receivable Troubled Debt Restructuring Specific Reserve | $ 0 | $ 0 | $ 0
Residential Real Estate [Member] | Senior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 5 | 12 | 9
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 693 | $ 530 | $ 546
Financing Receivable, Troubled Debt Restructuring | 676 | 502 | 411
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | $ 0 | $ 0
Residential Real Estate [Member] | Junior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 3 | 9
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 130 | $ 404
Financing Receivable, Troubled Debt Restructuring |  | 122 | 380
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0 | 0
Residential Real Estate [Member] | Contractual Payment Modification [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 683 | 301 | 917
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 | 513
Residential Real Estate [Member] | Contractual Payment Modification [Member] | Junior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 130 | 404
Residential Real Estate [Member] | Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 10 | 359 | 33
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 | 33
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 | 0
Residential Real Estate [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 0 | 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 | 0
Residential Real Estate [Member] | Extended Maturity [Member] | Junior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 0 | $ 0
Commercial Real Estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 2 | 5
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 644 | $ 10,857
Financing Receivable, Troubled Debt Restructuring |  | 634 | 10,758
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0 | $ 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 | 4
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 644 | $ 10,289
Financing Receivable, Troubled Debt Restructuring |  | 634 | 10,263
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0 | $ 0
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  |  | 1
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  | $ 568
Financing Receivable, Troubled Debt Restructuring |  |  | 495
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 | 10,857
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 | 10,289
Commercial Real Estate [Member] | Contractual Payment Modification [Member] | Owner Occupied Commercial Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  | 568
Commercial Real Estate [Member] | Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0 | 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 | 0
Commercial Real Estate [Member] | Contractual Interest Rate Reduction [Member] | Owner 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 | 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 | 0
Commercial Real Estate [Member] | Extended Maturity [Member] | Owner 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 | 14
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 173 | $ 262
Financing Receivable, Troubled Debt Restructuring |  | 144 | 224
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | $ 0 | $ 0
Loans To Individuals [Member] | Automobiles |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract |  | 7 | 14
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 173 | $ 262
Financing Receivable, Troubled Debt Restructuring |  | 144 | 224
Financing Receivable Troubled Debt Restructuring Specific Reserve |  | 0 | 0
Loans To Individuals [Member] | Contractual Payment Modification [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 63 | 148
Loans To Individuals [Member] | Contractual Payment Modification [Member] | Automobiles |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 63 | 148
Loans To Individuals [Member] | Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 110 | 114
Loans To Individuals [Member] | Contractual Interest Rate Reduction [Member] | Automobiles |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 110 | 114
Loans To Individuals [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 0 | 0
Loans To Individuals [Member] | Extended Maturity [Member] | Automobiles |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 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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