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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | $ 4,194 |
With a specific allowance recorded, Recorded Investment | 4,663 |
Recorded Investment | 8,857 |
Related Allowance | 1,996 |
Average Recorded Investment | 10,710 | $ 12,247
Interest Income Recognized | 361 | 292
Interest Income Recognized Cash Basis | 97 | $ 188
Consumer Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 509 |
With no related allowance recorded, Unpaid Principal Balance | 509 |
With no related allowance recorded, Average Recorded Investment | 355 |
With no related allowance recorded, Interest Income Recognized | 5 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 12 |
With a specific allowance recorded, Recorded Investment | 60 |
With a specific allowance recorded, Unpaid Principal Balance | 60 |
With a specific allowance recorded, Related Allowance | 6 |
With a specific allowance recorded, Average Recorded Investment | 15 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 1 |
Recorded Investment | 569 |
Unpaid Principal Balance | 569 |
Related Allowance | 6 |
Average Recorded Investment | 370 |
Interest Income Recognized | 5 |
Interest Income Recognized Cash Basis | 13 |
Agricultural Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 2,280 |
With no related allowance recorded, Unpaid Principal Balance | 2,385 |
With no related allowance recorded, Average Recorded Investment | 2,048 |
With no related allowance recorded, Interest Income Recognized | 25 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 6 |
With a specific allowance recorded, Average Recorded Investment | 1,388 |
Recorded Investment | 2,280 |
Unpaid Principal Balance | 2,385 |
Average Recorded Investment | 3,436 |
Interest Income Recognized | 25 |
Interest Income Recognized Cash Basis | 6 |
Agricultural [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 152 |
With no related allowance recorded, Unpaid Principal Balance | 152 |
With no related allowance recorded, Average Recorded Investment | 588 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 2 |
Recorded Investment | 152 |
Unpaid Principal Balance | 152 |
Average Recorded Investment | 588 |
Interest Income Recognized Cash Basis | 2 |
Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 1,234 |
With no related allowance recorded, Unpaid Principal Balance | 1,272 |
With no related allowance recorded, Average Recorded Investment | 1,252 |
With no related allowance recorded, Interest Income Recognized | 29 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 43 |
With a specific allowance recorded, Recorded Investment | 2,874 |
With a specific allowance recorded, Unpaid Principal Balance | 2,874 |
With a specific allowance recorded, Related Allowance | 438 |
With a specific allowance recorded, Average Recorded Investment | 3,176 |
With a specific allowance recorded, Interest Income Recognized | 150 |
Recorded Investment | 4,108 |
Unpaid Principal Balance | 4,146 |
Related Allowance | 438 |
Average Recorded Investment | 4,428 |
Interest Income Recognized | 179 |
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 17 |
With no related allowance recorded, Unpaid Principal Balance | 417 |
With no related allowance recorded, Average Recorded Investment | 135 |
With no related allowance recorded, Interest Income Recognized | 2 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 10 |
With a specific allowance recorded, Recorded Investment | 1,564 |
With a specific allowance recorded, Unpaid Principal Balance | 1,564 |
With a specific allowance recorded, Related Allowance | 1,551 |
With a specific allowance recorded, Average Recorded Investment | 1,736 |
With a specific allowance recorded, Interest Income Recognized | 149 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 23 |
Recorded Investment | 1,581 |
Unpaid Principal Balance | 1,981 |
Related Allowance | 1,551 |
Average Recorded Investment | 1,871 |
Interest Income Recognized | 151 |
Interest Income Recognized Cash Basis | 33 |
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
With no related allowance recorded, Recorded Investment | 2 |
With no related allowance recorded, Unpaid Principal Balance | 2 |
With no related allowance recorded, Average Recorded Investment | 15 |
With no related allowance recorded, Interest Income Recognized | 1 |
With a specific allowance recorded, Recorded Investment | 165 |
With a specific allowance recorded, Unpaid Principal Balance | 165 |
With a specific allowance recorded, Related Allowance | 1 |
With a specific allowance recorded, Average Recorded Investment | 2 |
Recorded Investment | 167 |
Unpaid Principal Balance | 167 |
Related Allowance | 1 |
Average Recorded Investment | 17 |
Interest Income Recognized | $ 1 |

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