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Allowance for Loan Losses - Summary of Nonaccrual Loans Excluding Purchased Credit-Impaired (PCI) Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 3,519 | $ 5,125
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status |  | 139
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 359 | 964
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 4 | 6
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 3,129 | 3,893
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 6 | 7
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status |  | 85
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 21 | $ 31

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