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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 1,228 $ 5,172  
With a specific allowance recorded, Recorded Investment 10,711 9,360  
Related Allowance 2,184 1,657  
Recorded Investment 11,939 14,532  
Average Recorded Investment 12,247 10,232 $ 2,649
Interest Income Recognized 292 269 118
Interest Income Recognized Cash Basis 188 135 $ 9
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 604 799  
With no related allowance recorded, Unpaid Principal Balance 604 799  
With no related allowance recorded, Average Recorded Investment 456 738  
With no related allowance recorded, Interest Income Recognized 5 22  
With no related allowance recorded, Interest Income Recognized Cash Basis 15 10  
With a specific allowance recorded, Recorded Investment   202  
With a specific allowance recorded, Unpaid Principal Balance   202  
Related Allowance   31  
With a specific allowance recorded, Average Recorded Investment 59 126  
With a specific allowance recorded, Interest Income Recognized Cash Basis   3  
Recorded Investment 604 1,001  
Unpaid Principal Balance 604 1,001  
Average Recorded Investment 515 864  
Interest Income Recognized 5 22  
Interest Income Recognized Cash Basis 15 13  
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 423 1,546  
With no related allowance recorded, Unpaid Principal Balance 423 1,549  
With no related allowance recorded, Average Recorded Investment 1,000 729  
With no related allowance recorded, Interest Income Recognized 33 18  
With no related allowance recorded, Interest Income Recognized Cash Basis   12  
With a specific allowance recorded, Recorded Investment 6,302 5,210  
With a specific allowance recorded, Unpaid Principal Balance 6,406 5,210  
Related Allowance 691 600  
With a specific allowance recorded, Average Recorded Investment 5,414 3,175  
With a specific allowance recorded, Interest Income Recognized 54 6  
With a specific allowance recorded, Interest Income Recognized Cash Basis   102  
Recorded Investment 6,725 6,756  
Unpaid Principal Balance 6,829 6,759  
Average Recorded Investment 6,414 3,904  
Interest Income Recognized 87 24  
Interest Income Recognized Cash Basis   114  
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment   291  
With no related allowance recorded, Unpaid Principal Balance   291  
With no related allowance recorded, Average Recorded Investment 143 392  
With no related allowance recorded, Interest Income Recognized 18 3  
With no related allowance recorded, Interest Income Recognized Cash Basis 3 3  
With a specific allowance recorded, Recorded Investment 20 176  
With a specific allowance recorded, Unpaid Principal Balance 20 176  
Related Allowance 1 116  
With a specific allowance recorded, Average Recorded Investment 94 188  
Recorded Investment 20 467  
Unpaid Principal Balance 20 467  
Average Recorded Investment 237 580  
Interest Income Recognized 18 3  
Interest Income Recognized Cash Basis 3 3  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 180 185  
With no related allowance recorded, Unpaid Principal Balance 180 185  
With no related allowance recorded, Average Recorded Investment 1,445 195  
With no related allowance recorded, Interest Income Recognized 70 13  
With no related allowance recorded, Interest Income Recognized Cash Basis 9    
With a specific allowance recorded, Recorded Investment 3,381 2,765  
With a specific allowance recorded, Unpaid Principal Balance 3,381 2,765  
Related Allowance 664 20  
With a specific allowance recorded, Average Recorded Investment 2,199 2,524  
With a specific allowance recorded, Interest Income Recognized 70 128  
With a specific allowance recorded, Interest Income Recognized Cash Basis 3    
Recorded Investment 3,561 2,950  
Unpaid Principal Balance 3,561 2,950  
Average Recorded Investment 3,644 2,719  
Interest Income Recognized 140 141  
Interest Income Recognized Cash Basis 12    
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 21 2,328  
With no related allowance recorded, Unpaid Principal Balance 21 2,328  
With no related allowance recorded, Average Recorded Investment 920 1,222  
With no related allowance recorded, Interest Income Recognized 24 26  
With no related allowance recorded, Interest Income Recognized Cash Basis 158 5  
With a specific allowance recorded, Recorded Investment 982 1,007  
With a specific allowance recorded, Unpaid Principal Balance 982 1,007  
Related Allowance 825 890  
With a specific allowance recorded, Average Recorded Investment 498 916  
With a specific allowance recorded, Interest Income Recognized 17 52  
Recorded Investment 1,003 3,335  
Unpaid Principal Balance 1,003 3,335  
Average Recorded Investment 1,418 2,138  
Interest Income Recognized 41 78  
Interest Income Recognized Cash Basis 158 5  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment   23  
With no related allowance recorded, Unpaid Principal Balance   23  
With no related allowance recorded, Average Recorded Investment 17 16  
With a specific allowance recorded, Recorded Investment 26    
With a specific allowance recorded, Unpaid Principal Balance 26    
Related Allowance 3    
With a specific allowance recorded, Average Recorded Investment 2 11  
With a specific allowance recorded, Interest Income Recognized 1 1  
Recorded Investment 26 23  
Unpaid Principal Balance 26 23  
Average Recorded Investment 19 27  
Interest Income Recognized $ 1 $ 1