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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