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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | $ 4,194 | $ 5,835 | $ 5,835 | $ 4,194
With a specific allowance recorded, Recorded Investment | 4,663 | 4,918 | 4,918 | 4,663
Related Allowance | 1,996 | 2,436 | 2,436 | 1,996
Recorded Investment | 8,857 | 10,753 | 10,753 | 8,857
Average Recorded Investment | 9,660 | 10,662 | 11,059 | 10,710
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 509 | 624 | 624 | 509
With no related allowance recorded, Unpaid Principal Balance | 509 | 624 | 624 | 509
With no related allowance recorded, Average Recorded Investment |  | 352 | 372 | 355
With no related allowance recorded, Interest Income Recognized |  | 1 | 3 | 5
With no related allowance recorded, Interest Income Recognized Cash Basis |  | 5 | 10 | 12
With a specific allowance recorded, Recorded Investment | 60 |  |  | 60
With a specific allowance recorded, Unpaid Principal Balance | 60 |  |  | 60
Related Allowance | 6 |  |  | 6
With a specific allowance recorded, Average Recorded Investment |  |  |  | 15
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 1
Recorded Investment | 569 | 624 | 624 | 569
Unpaid Principal Balance | 569 | 624 | 624 | 569
Average Recorded Investment |  | 352 | 372 | 370
Interest Income Recognized |  | 1 | 3 | 5
Interest Income Recognized Cash Basis |  | 5 | 10 | 13
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 2,280 | 2,588 | 2,588 | 2,280
With no related allowance recorded, Unpaid Principal Balance | 2,385 | 2,693 | 2,693 | 2,385
With no related allowance recorded, Average Recorded Investment |  | 2,467 | 1,953 | 2,048
With no related allowance recorded, Interest Income Recognized |  | 6 | 19 | 25
With no related allowance recorded, Interest Income Recognized Cash Basis |  | 1 | 6 | 6
With a specific allowance recorded, Average Recorded Investment |  |  | 1,850 | 1,388
Recorded Investment | 2,280 | 2,588 | 2,588 | 2,280
Unpaid Principal Balance | 2,385 | 2,693 | 2,693 | 2,385
Average Recorded Investment |  | 2,467 | 3,803 | 3,436
Interest Income Recognized |  | 6 | 19 | 25
Interest Income Recognized Cash Basis |  | 1 | 6 | 6
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 152 | 1,334 | 1,334 | 152
With no related allowance recorded, Unpaid Principal Balance | 152 | 1,334 | 1,334 | 152
With no related allowance recorded, Average Recorded Investment |  | 1,309 | 591 | 588
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 2 | 2
Recorded Investment | 152 | 1,334 | 1,334 | 152
Unpaid Principal Balance | 152 | 1,334 | 1,334 | 152
Average Recorded Investment |  | 1,309 | 591 | 588
Interest Income Recognized Cash Basis |  |  | 2 | 2
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 1,234 | 1,251 | 1,251 | 1,234
With no related allowance recorded, Unpaid Principal Balance | 1,272 | 1,251 | 1,251 | 1,272
With no related allowance recorded, Average Recorded Investment |  | 1,505 | 1,162 | 1,252
With no related allowance recorded, Interest Income Recognized |  | 9 | 20 | 29
With no related allowance recorded, Interest Income Recognized Cash Basis |  | 14 | 33 | 43
With a specific allowance recorded, Recorded Investment | 2,874 | 2,936 | 2,936 | 2,874
With a specific allowance recorded, Unpaid Principal Balance | 2,874 | 2,936 | 2,936 | 2,874
Related Allowance | 438 | 500 | 500 | 438
With a specific allowance recorded, Average Recorded Investment |  | 2,960 | 3,270 | 3,176
With a specific allowance recorded, Interest Income Recognized |  | 39 | 113 | 150
Recorded Investment | 4,108 | 4,187 | 4,187 | 4,108
Unpaid Principal Balance | 4,146 | 4,187 | 4,187 | 4,146
Average Recorded Investment |  | 4,465 | 4,432 | 4,428
Interest Income Recognized |  | 48 | 133 | 179
Interest Income Recognized Cash Basis |  | 14 | 33 | 43
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 17 | 21 | 21 | 17
With no related allowance recorded, Unpaid Principal Balance | 417 | 21 | 21 | 417
With no related allowance recorded, Average Recorded Investment |  | 63 | 175 | 135
With no related allowance recorded, Interest Income Recognized |  |  | 2 | 2
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 10 | 10
With a specific allowance recorded, Recorded Investment | 1,564 | 1,982 | 1,982 | 1,564
With a specific allowance recorded, Unpaid Principal Balance | 1,564 | 1,982 | 1,982 | 1,564
Related Allowance | 1,551 | 1,936 | 1,936 | 1,551
With a specific allowance recorded, Average Recorded Investment |  | 1,989 | 1,665 | 1,736
With a specific allowance recorded, Interest Income Recognized |  | 72 | 138 | 149
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 23
Recorded Investment | 1,581 | 2,003 | 2,003 | 1,581
Unpaid Principal Balance | 1,981 | 2,003 | 2,003 | 1,981
Average Recorded Investment |  | 2,052 | 1,840 | 1,871
Interest Income Recognized |  | 72 | 140 | 151
Interest Income Recognized Cash Basis |  |  | 10 | 33
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 2 | 17 | 17 | 2
With no related allowance recorded, Unpaid Principal Balance | 2 | 17 | 17 | 2
With no related allowance recorded, Average Recorded Investment |  | 17 | 18 | 15
With no related allowance recorded, Interest Income Recognized |  |  | 1 | 1
With a specific allowance recorded, Recorded Investment | 165 |  |  | 165
With a specific allowance recorded, Unpaid Principal Balance | 165 |  |  | 165
Related Allowance | 1 |  |  | 1
With a specific allowance recorded, Average Recorded Investment |  |  | 3 | 2
Recorded Investment | 167 | 17 | 17 | 167
Unpaid Principal Balance | $ 167 | 17 | 17 | 167
Average Recorded Investment |  | $ 17 | 21 | 17
Interest Income Recognized |  |  | $ 1 | $ 1

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