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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 4,194 $ 3,990 $ 4,194
With a specific allowance recorded, Recorded Investment 4,663 8,634 4,663
Related Allowance 1,996 1,535 1,996
Recorded Investment 8,857 12,624 8,857
Average Recorded Investment 9,660 12,764 10,710
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 509 692 509
With no related allowance recorded, Unpaid Principal Balance 509 692 509
With no related allowance recorded, Average Recorded Investment   372 355
With no related allowance recorded, Interest Income Recognized   1 5
With no related allowance recorded, Interest Income Recognized Cash Basis   2 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 569 692 569
Unpaid Principal Balance 569 692 569
Average Recorded Investment   372 370
Interest Income Recognized   1 5
Interest Income Recognized Cash Basis   2 13
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2,280 2,172 2,280
With no related allowance recorded, Unpaid Principal Balance 2,385 2,276 2,385
With no related allowance recorded, Average Recorded Investment   1,145 2,048
With no related allowance recorded, Interest Income Recognized   7 25
With no related allowance recorded, Interest Income Recognized Cash Basis   2 6
With a specific allowance recorded, Recorded Investment   4,498  
With a specific allowance recorded, Unpaid Principal Balance   4,498  
Related Allowance   273  
With a specific allowance recorded, Average Recorded Investment   5,550 1,388
Recorded Investment 2,280 6,670 2,280
Unpaid Principal Balance 2,385 6,774 2,385
Average Recorded Investment   6,695 3,436
Interest Income Recognized   7 25
Interest Income Recognized Cash Basis   2 6
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 152 20 152
With no related allowance recorded, Unpaid Principal Balance 152 20 152
With no related allowance recorded, Average Recorded Investment   20 588
With no related allowance recorded, Interest Income Recognized Cash Basis     2
Recorded Investment 152 20 152
Unpaid Principal Balance 152 20 152
Average Recorded Investment   20 588
Interest Income Recognized Cash Basis     2
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,234 749 1,234
With no related allowance recorded, Unpaid Principal Balance 1,272 749 1,272
With no related allowance recorded, Average Recorded Investment   660 1,252
With no related allowance recorded, Interest Income Recognized   4 29
With no related allowance recorded, Interest Income Recognized Cash Basis   5 43
With a specific allowance recorded, Recorded Investment 2,874 3,348 2,874
With a specific allowance recorded, Unpaid Principal Balance 2,874 3,348 2,874
Related Allowance 438 632 438
With a specific allowance recorded, Average Recorded Investment   3,745 3,176
With a specific allowance recorded, Interest Income Recognized   37 150
Recorded Investment 4,108 4,097 4,108
Unpaid Principal Balance 4,146 4,097 4,146
Average Recorded Investment   4,405 4,428
Interest Income Recognized   41 179
Interest Income Recognized Cash Basis   5 43
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 17 334 17
With no related allowance recorded, Unpaid Principal Balance 417 334 417
With no related allowance recorded, Average Recorded Investment   254 135
With no related allowance recorded, Interest Income Recognized   2 2
With no related allowance recorded, Interest Income Recognized Cash Basis     10
With a specific allowance recorded, Recorded Investment 1,564 788 1,564
With a specific allowance recorded, Unpaid Principal Balance 1,564 788 1,564
Related Allowance 1,551 630 1,551
With a specific allowance recorded, Average Recorded Investment   994 1,736
With a specific allowance recorded, Interest Income Recognized   14 149
With a specific allowance recorded, Interest Income Recognized Cash Basis     23
Recorded Investment 1,581 1,122 1,581
Unpaid Principal Balance 1,981 1,122 1,981
Average Recorded Investment   1,248 1,871
Interest Income Recognized   16 151
Interest Income Recognized Cash Basis     33
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2 23 2
With no related allowance recorded, Unpaid Principal Balance 2 23 2
With no related allowance recorded, Average Recorded Investment   16 15
With no related allowance recorded, Interest Income Recognized     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   8 2
Recorded Investment 167 23 167
Unpaid Principal Balance $ 167 23 167
Average Recorded Investment   $ 24 17
Interest Income Recognized     $ 1