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Allowances for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |
With an allowance recorded, Related Allowance | $ 4 |  | $ 0
Total, Recorded Investment | 2,351 |  | 751
Total, Unpaid Principal Balance | 2,491 |  | 840
Total, Related Allowance | 4 |  | 0
With no related allowance recorded, Average Recorded Investment | 2,369 | $ 249 |
With no related allowance recorded, Interest Recognized | 23 | 4 |
Total, Average Recorded Investment | 2,373 | 249 |
Total, Interest Recognized | 23 | 4 |
Agriculture Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 250 |  | 0
With no related allowance recorded, Unpaid Principal Balance | 250 |  | 0
With an allowance recorded, Recorded Investment | 0 |  | 0
With an allowance recorded, Unpaid Principal Balance | 0 |  | 0
With an allowance recorded, Related Allowance | 0 |  | 0
Total, Recorded Investment | 250 |  | 0
Total, Unpaid Principal Balance | 250 |  | 0
Total, Related Allowance | 0 |  | 0
With no related allowance recorded, Average Recorded Investment | 249 | 0 |
With no related allowance recorded, Interest Recognized | 3 | 0 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Commercial Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 37 |  | 42
With no related allowance recorded, Unpaid Principal Balance | 56 |  | 61
With an allowance recorded, Recorded Investment | 0 |  | 0
With an allowance recorded, Unpaid Principal Balance | 0 |  | 0
With an allowance recorded, Related Allowance | 0 |  | 0
Total, Recorded Investment | 37 |  | 42
Total, Unpaid Principal Balance | 56 |  | 61
Total, Related Allowance | 0 |  | 0
With no related allowance recorded, Average Recorded Investment | 37 | 1 |
With no related allowance recorded, Interest Recognized | 0 | 0 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Commercial Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 177 |  |
With no related allowance recorded, Unpaid Principal Balance | 177 |  |
With an allowance recorded, Recorded Investment | 0 |  | 0
With an allowance recorded, Unpaid Principal Balance | 0 |  | 0
With an allowance recorded, Related Allowance | 0 |  | 0
Total, Recorded Investment | 177 |  | 0
Total, Unpaid Principal Balance | 177 |  | 0
Total, Related Allowance | 0 |  | 0
With no related allowance recorded, Average Recorded Investment | 181 | 0 |
With no related allowance recorded, Interest Recognized | 3 | 0 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 1,883 |  | 709
With no related allowance recorded, Unpaid Principal Balance | 2,004 |  | 779
With an allowance recorded, Recorded Investment | 4 |  | 0
With an allowance recorded, Unpaid Principal Balance | 4 |  | 0
With an allowance recorded, Related Allowance | 4 |  | 0
Total, Recorded Investment | 1,887 |  | 709
Total, Unpaid Principal Balance | 2,008 |  | 779
Total, Related Allowance | 4 |  | 0
With no related allowance recorded, Average Recorded Investment | 1,902 | 248 |
With no related allowance recorded, Interest Recognized | 17 | 4 |
With an allowance recorded, Average Recorded Investment | 4 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Consumer Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 0 |  |
With no related allowance recorded, Unpaid Principal Balance | 0 |  |
With an allowance recorded, Recorded Investment | 0 |  | 0
With an allowance recorded, Unpaid Principal Balance | 0 |  | 0
With an allowance recorded, Related Allowance | 0 |  | 0
Total, Recorded Investment | 0 |  | 0
Total, Unpaid Principal Balance | 0 |  | 0
Total, Related Allowance | 0 |  | 0
With no related allowance recorded, Average Recorded Investment | 0 | 0 |
With no related allowance recorded, Interest Recognized | 0 | 0 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Municipal Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 0 |  |
With no related allowance recorded, Unpaid Principal Balance | 0 |  |
With an allowance recorded, Recorded Investment | 0 |  | 0
With an allowance recorded, Unpaid Principal Balance | 0 |  | 0
With an allowance recorded, Related Allowance | 0 |  | 0
Total, Recorded Investment | 0 |  | 0
Total, Unpaid Principal Balance | 0 |  | 0
Total, Related Allowance | 0 |  | $ 0
With no related allowance recorded, Average Recorded Investment | 0 | 0 |
With no related allowance recorded, Interest Recognized | 0 | 0 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | $ 0 | $ 0 |

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