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Allowance for Loan Losses - Summary of Nonaccrual Loans Excluding Purchased Credit-Impaired (PCI) Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 3,725 | $ 3,673
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 78 | 78
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 292 | 334
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 3 | 4
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 3,326 | 3,232
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 4 | 5
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 22 | $ 20

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