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Allowance for Loan Losses - Schedule of Loan Modifications (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 Contract | Dec. 31, 2021 USD ($) Contract | Dec. 31, 2019 Contract | Dec. 31, 2020 USD ($)
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  |  | 1 |
Loans modified as troubled debt restructuring | $ |  | $ 0 |  | $ 0
Second Modifications [Member] | CARES Act [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  | 7 |  |
Loans modified as troubled debt restructuring | $ |  | $ 5,142 |  |
Percent of Loans Outstanding |  | 0.26% |  |
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified | 813 |  |  |
Loans modified as troubled debt restructuring | $ |  |  |  | $ 431,300
Commercial and Agriculture [Member] | Second Modifications [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  | 7 |  |
Loans modified as troubled debt restructuring | $ |  | $ 5,142 |  |
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  | 2 |  |
Loans modified as troubled debt restructuring | $ |  | $ 498 |  |
Percent of Loans Outstanding |  | 0.03% |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  |  | 1 |
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans modified |  | 5 |  |
Loans modified as troubled debt restructuring | $ |  | $ 4,644 |  |
Percent of Loans Outstanding |  | 0.24% |  |

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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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- Definition Amount of financing receivable modified as troubled debt restructuring. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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