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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Contract | Dec. 31, 2020 USD ($) Contract | Dec. 31, 2019 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 30 | 41 | 38
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 9,370 | $ 14,874 | $ 8,302
Financing Receivable, Troubled Debt Restructuring | 1,690 | 13,969 | 1,928
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | 636 | 0
Contractual Payment Modification [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 8,901 | 14,098 | 7,525
Contractual Interest Rate Reduction [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 469 | 776 | 760
Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 0 | $ 0 | $ 17
Commercial Loan [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 6 | 4 | 2
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 7,893 | $ 2,805 | $ 156
Financing Receivable, Troubled Debt Restructuring | 288 | 2,196 | 154
Financing Receivable Troubled Debt Restructuring Specific Reserve | $ 0 | $ 636 | 0
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 | 156
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 | 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 | 629 |
Commercial Loan [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 0 | 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 | 15 | 18 | 20
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 660 | $ 950 | $ 1,186
Financing Receivable, Troubled Debt Restructuring | 624 | 791 | 1,059
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 | 12 | 9 |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 530 | $ 546 |
Financing Receivable, Troubled Debt Restructuring | 502 | 411 |
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 | 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 | 301 | 917 | 965
Residential Real Estate [Member] | Contractual Payment Modification [Member] | Senior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 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 | 359 | 33 | 204
Residential Real Estate [Member] | Contractual Interest Rate Reduction [Member] | Senior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 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 | $ 17
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 | $ 0 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 2 | 5 | 5
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 644 | $ 10,857 | $ 6,817
Financing Receivable, Troubled Debt Restructuring | 634 | 10,758 | 594
Financing Receivable Troubled Debt Restructuring Specific Reserve | $ 0 | $ 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 | 0 | 1 |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 0 | $ 568 |
Financing Receivable, Troubled Debt Restructuring | 0 | 495 |
Financing Receivable Troubled Debt Restructuring Specific Reserve | 0 | 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 | 6,261
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 | 0 | 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 | 556
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 | 0 |
Commercial Real Estate [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | 0 | 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 | $ 0 |
Loans To Individuals [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | Contract | 7 | 14 | 11
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 173 | $ 262 | $ 143
Financing Receivable, Troubled Debt Restructuring | 144 | 224 | 121
Financing Receivable Troubled Debt Restructuring Specific Reserve | $ 0 | $ 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 | 143
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 | 0
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 | $ 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 http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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