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Allowances for Loan Losses - Summary of Portfolio of Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | $ 1,246 | $ 634
Commercial Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | 37 | 39
Commercial Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | 143 | 144
Residential Real Estate Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | 1,062 | 449
Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Financing receivable, nonaccrual | $ 4 | $ 2

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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