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Allowance for Loan Losses - Schedule of Loan Modifications (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Loan | Jun. 30, 2021 USD ($) Loan
Financing Receivable Modifications [Line Items] |  |
Loans modified as troubled debt restructuring | $ 0 | $ 0
Second Modifications [Member] | CARES Act [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 34
Loans modified as troubled debt restructuring |  | $ 50,436,000
Percent of Loans Outstanding |  | 2.50%
Commercial and Agriculture [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan | 813 |
Loans modified as troubled debt restructuring | $ 431,300,000 |
Commercial and Agriculture [Member] | Second Modifications [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 34
Loans modified as troubled debt restructuring |  | $ 50,436,000
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 13
Loans modified as troubled debt restructuring |  | $ 4,222,000
Percent of Loans Outstanding |  | 0.21%
Commercial Real Estate Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 5
Loans modified as troubled debt restructuring |  | $ 8,185,000
Percent of Loans Outstanding |  | 0.41%
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 15
Loans modified as troubled debt restructuring |  | $ 37,544,000
Percent of Loans Outstanding |  | 1.86%
Real Estate Construction [Member] | Second Modifications [Member] | CARES Act [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans modified | Loan |  | 1
Loans modified as troubled debt restructuring |  | $ 485,000
Percent of Loans Outstanding |  | 0.02%

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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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