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Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |  |
With an allowance recorded, Recorded Investment |  |  | $ 0
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 20
Total, Recorded Investment |  |  | 7,313
Total, Unpaid Principal Balance |  |  | 7,370
Total, Related Allowance |  |  | 20
With no related allowance recorded, Average Recorded Investment | $ 8,541 | $ 8,809 |
With no related allowance recorded, Interest Recognized | 96 | 195 |
With an allowance recorded, Average Recorded Investment | 0 | 0 |
With an allowance recorded, Interest Recognized | 0 | 0 |
Total, Average Recorded Investment | 8,541 | 8,809 |
Total, Interest Recognized | 96 | 195 |
Agriculture Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment |  |  | 300
With no related allowance recorded, Unpaid Principal Balance |  |  | 300
With an allowance recorded, Recorded Investment |  |  | 0
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 0
Total, Recorded Investment |  |  | 300
Total, Unpaid Principal Balance |  |  | 300
Total, Related Allowance |  |  | 0
With no related allowance recorded, Average Recorded Investment | 237 | 242 |
With no related allowance recorded, Interest Recognized | 3 | 6 |
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 |  |  | 35
With no related allowance recorded, Unpaid Principal Balance |  |  | 55
With an allowance recorded, Recorded Investment |  |  | 20
With an allowance recorded, Unpaid Principal Balance |  |  | 20
With an allowance recorded, Related Allowance |  |  | 20
Total, Recorded Investment |  |  | 55
Total, Unpaid Principal Balance |  |  | 75
Total, Related Allowance |  |  | 20
With no related allowance recorded, Average Recorded Investment | 4,706 | 4,935 |
With no related allowance recorded, Interest Recognized | 66 | 132 |
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 |  |  | 2,306
With no related allowance recorded, Unpaid Principal Balance |  |  | 2,312
With an allowance recorded, Recorded Investment |  |  | 0
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 0
Total, Recorded Investment |  |  | 2,306
Total, Unpaid Principal Balance |  |  | 2,312
Total, Related Allowance |  |  | 0
With no related allowance recorded, Average Recorded Investment | 455 | 461 |
With no related allowance recorded, Interest Recognized | 4 | 9 |
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 |  |  | 4,652
With no related allowance recorded, Unpaid Principal Balance |  |  | 4,683
With an allowance recorded, Recorded Investment |  |  | 0
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 0
Total, Recorded Investment |  |  | 4,652
Total, Unpaid Principal Balance |  |  | 4,683
Total, Related Allowance |  |  | 0
With no related allowance recorded, Average Recorded Investment | 3,143 | 3,171 |
With no related allowance recorded, Interest Recognized | 23 | 48 |
With an allowance recorded, Average Recorded Investment | 0 | 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
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 0
Total, Recorded Investment |  |  | 0
Total, Unpaid Principal Balance |  |  | 0
Total, Related Allowance |  |  | 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
With an allowance recorded, Unpaid Principal Balance |  |  | 0
With an allowance recorded, Related Allowance |  |  | 0
Total, Recorded Investment |  |  | 0
Total, Unpaid Principal Balance |  |  | 0
Total, Related Allowance |  |  | $ 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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