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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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 3,990 $ 1,228 $ 6,604 $ 1,228
With a specific allowance recorded, Recorded Investment 8,634 10,711 5,532 10,711
Related Allowance 1,535 2,184 1,109 2,184
Recorded Investment 12,624 11,939 12,136 11,939
Average Recorded Investment 12,764 11,676 13,467 12,247
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 692 604 817 604
With no related allowance recorded, Unpaid Principal Balance 692 604 817 604
With no related allowance recorded, Average Recorded Investment 372   508 456
With no related allowance recorded, Interest Income Recognized 1   1 5
With no related allowance recorded, Interest Income Recognized Cash Basis 2   2 15
With a specific allowance recorded, Recorded Investment     134  
With a specific allowance recorded, Unpaid Principal Balance     134  
Related Allowance     23  
With a specific allowance recorded, Average Recorded Investment     179 59
With a specific allowance recorded, Interest Income Recognized Cash Basis     2  
Recorded Investment 692 604 951 604
Unpaid Principal Balance 692 604 951 604
Average Recorded Investment 372   687 515
Interest Income Recognized 1   1 5
Interest Income Recognized Cash Basis 2   4 15
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 2,172 423 1,526 423
With no related allowance recorded, Unpaid Principal Balance 2,276 423 1,526 423
With no related allowance recorded, Average Recorded Investment 1,145   1,531 1,000
With no related allowance recorded, Interest Income Recognized 7   23 33
With no related allowance recorded, Interest Income Recognized Cash Basis 2      
With a specific allowance recorded, Recorded Investment 4,498 6,302 5,106 6,302
With a specific allowance recorded, Unpaid Principal Balance 4,498 6,406 5,106 6,406
Related Allowance 273 691 1,086 691
With a specific allowance recorded, Average Recorded Investment 5,550   5,160 5,414
With a specific allowance recorded, Interest Income Recognized       54
Recorded Investment 6,670 6,725 6,632 6,725
Unpaid Principal Balance 6,774 6,829 6,632 6,829
Average Recorded Investment 6,695   6,691 6,414
Interest Income Recognized 7   23 87
Interest Income Recognized Cash Basis 2      
Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 20      
With no related allowance recorded, Unpaid Principal Balance 20      
With no related allowance recorded, Average Recorded Investment 20   168 143
With no related allowance recorded, Interest Income Recognized       18
With no related allowance recorded, Interest Income Recognized Cash Basis       3
With a specific allowance recorded, Recorded Investment   20 292 20
With a specific allowance recorded, Unpaid Principal Balance   20 292 20
Related Allowance   1   1
With a specific allowance recorded, Average Recorded Investment     214 94
With a specific allowance recorded, Interest Income Recognized     4  
Recorded Investment 20 20 292 20
Unpaid Principal Balance 20 20 292 20
Average Recorded Investment 20   382 237
Interest Income Recognized     4 18
Interest Income Recognized Cash Basis       3
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 749 180 2,905 180
With no related allowance recorded, Unpaid Principal Balance 749 180 2,905 180
With no related allowance recorded, Average Recorded Investment 660   2,306 1,445
With no related allowance recorded, Interest Income Recognized 4   31 70
With no related allowance recorded, Interest Income Recognized Cash Basis 5   3 9
With a specific allowance recorded, Recorded Investment 3,348 3,381   3,381
With a specific allowance recorded, Unpaid Principal Balance 3,348 3,381   3,381
Related Allowance 632 664   664
With a specific allowance recorded, Average Recorded Investment 3,745   917 2,199
With a specific allowance recorded, Interest Income Recognized 37     70
With a specific allowance recorded, Interest Income Recognized Cash Basis       3
Recorded Investment 4,097 3,561 2,905 3,561
Unpaid Principal Balance 4,097 3,561 2,905 3,561
Average Recorded Investment 4,405   3,223 3,644
Interest Income Recognized 41   31 140
Interest Income Recognized Cash Basis 5   3 12
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 334 21 1,335 21
With no related allowance recorded, Unpaid Principal Balance 334 21 1,467 21
With no related allowance recorded, Average Recorded Investment 254   1,793 920
With no related allowance recorded, Interest Income Recognized 2   17 24
With no related allowance recorded, Interest Income Recognized Cash Basis     1 158
With a specific allowance recorded, Recorded Investment 788 982   982
With a specific allowance recorded, Unpaid Principal Balance 788 982   982
Related Allowance 630 825   825
With a specific allowance recorded, Average Recorded Investment 994   670 498
With a specific allowance recorded, Interest Income Recognized 14     17
Recorded Investment 1,122 1,003 1,335 1,003
Unpaid Principal Balance 1,122 1,003 1,467 1,003
Average Recorded Investment 1,248   2,463 1,418
Interest Income Recognized 16   17 41
Interest Income Recognized Cash Basis     1 158
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 23   21  
With no related allowance recorded, Unpaid Principal Balance 23   21  
With no related allowance recorded, Average Recorded Investment 16   21 17
With a specific allowance recorded, Recorded Investment   26   26
With a specific allowance recorded, Unpaid Principal Balance   26   26
Related Allowance   3   3
With a specific allowance recorded, Average Recorded Investment 8     2
With a specific allowance recorded, Interest Income Recognized       1
Recorded Investment 23 26 21 26
Unpaid Principal Balance 23 $ 26 21 26
Average Recorded Investment $ 24   $ 21 19
Interest Income Recognized       $ 1