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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 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 4,194 | $ 1,228 |
With a specific allowance recorded, Recorded Investment | 4,663 | 10,711 |
Related Allowance | 1,996 | 2,184 |
Recorded Investment | 8,857 | 11,939 |
Average Recorded Investment | 10,710 | 12,247 | $ 10,232
Interest Income Recognized | 361 | 292 | 269
Interest Income Recognized Cash Basis | 97 | 188 | $ 135
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 509 | 604 |
With no related allowance recorded, Unpaid Principal Balance | 509 | 604 |
With no related allowance recorded, Average Recorded Investment | 355 | 456 |
With no related allowance recorded, Interest Income Recognized | 5 | 5 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 12 | 15 |
With a specific allowance recorded, Recorded Investment | 60 |  |
With a specific allowance recorded, Unpaid Principal Balance | 60 |  |
Related Allowance | 6 |  |
With a specific allowance recorded, Average Recorded Investment | 15 | 59 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 1 |  |
Recorded Investment | 569 | 604 |
Unpaid Principal Balance | 569 | 604 |
Average Recorded Investment | 370 | 515 |
Interest Income Recognized | 5 | 5 |
Interest Income Recognized Cash Basis | 13 | 15 |
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 2,280 | 423 |
With no related allowance recorded, Unpaid Principal Balance | 2,385 | 423 |
With no related allowance recorded, Average Recorded Investment | 2,048 | 1,000 |
With no related allowance recorded, Interest Income Recognized | 25 | 33 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 6 |  |
With a specific allowance recorded, Recorded Investment |  | 6,302 |
With a specific allowance recorded, Unpaid Principal Balance |  | 6,406 |
Related Allowance |  | 691 |
With a specific allowance recorded, Average Recorded Investment | 1,388 | 5,414 |
With a specific allowance recorded, Interest Income Recognized |  | 54 |
Recorded Investment | 2,280 | 6,725 |
Unpaid Principal Balance | 2,385 | 6,829 |
Average Recorded Investment | 3,436 | 6,414 |
Interest Income Recognized | 25 | 87 |
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 | 143 |
With no related allowance recorded, Interest Income Recognized |  | 18 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 2 | 3 |
With a specific allowance recorded, Recorded Investment |  | 20 |
With a specific allowance recorded, Unpaid Principal Balance |  | 20 |
Related Allowance |  | 1 |
With a specific allowance recorded, Average Recorded Investment |  | 94 |
Recorded Investment | 152 | 20 |
Unpaid Principal Balance | 152 | 20 |
Average Recorded Investment | 588 | 237 |
Interest Income Recognized |  | 18 |
Interest Income Recognized Cash Basis | 2 | 3 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 1,234 | 180 |
With no related allowance recorded, Unpaid Principal Balance | 1,272 | 180 |
With no related allowance recorded, Average Recorded Investment | 1,252 | 1,445 |
With no related allowance recorded, Interest Income Recognized | 29 | 70 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 43 | 9 |
With a specific allowance recorded, Recorded Investment | 2,874 | 3,381 |
With a specific allowance recorded, Unpaid Principal Balance | 2,874 | 3,381 |
Related Allowance | 438 | 664 |
With a specific allowance recorded, Average Recorded Investment | 3,176 | 2,199 |
With a specific allowance recorded, Interest Income Recognized | 150 | 70 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  | 3 |
Recorded Investment | 4,108 | 3,561 |
Unpaid Principal Balance | 4,146 | 3,561 |
Average Recorded Investment | 4,428 | 3,644 |
Interest Income Recognized | 179 | 140 |
Interest Income Recognized Cash Basis | 43 |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 17 | 21 |
With no related allowance recorded, Unpaid Principal Balance | 417 | 21 |
With no related allowance recorded, Average Recorded Investment | 135 | 920 |
With no related allowance recorded, Interest Income Recognized | 2 | 24 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 10 | 158 |
With a specific allowance recorded, Recorded Investment | 1,564 | 982 |
With a specific allowance recorded, Unpaid Principal Balance | 1,564 | 982 |
Related Allowance | 1,551 | 825 |
With a specific allowance recorded, Average Recorded Investment | 1,736 | 498 |
With a specific allowance recorded, Interest Income Recognized | 149 | 17 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 23 |  |
Recorded Investment | 1,581 | 1,003 |
Unpaid Principal Balance | 1,981 | 1,003 |
Average Recorded Investment | 1,871 | 1,418 |
Interest Income Recognized | 151 | 41 |
Interest Income Recognized Cash Basis | 33 | 158 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 2 | 26 |
With no related allowance recorded, Unpaid Principal Balance | 2 | 26 |
With no related allowance recorded, Average Recorded Investment | 15 | 17 |
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 |  |
Related Allowance | 1 | 3 |
With a specific allowance recorded, Average Recorded Investment | 2 | 2 |
With a specific allowance recorded, Interest Income Recognized |  | 1 |
Recorded Investment | 167 | 26 |
Unpaid Principal Balance | 167 | 26 |
Average Recorded Investment | 17 | 19 |
Interest Income Recognized | $ 1 | $ 1 |

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