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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 4,194 $ 1,228  
With a specific allowance recorded, Recorded Investment 4,663 10,711  
Related Allowance 1,996 2,184  
Recorded Investment 8,857 11,939  
Average Recorded Investment 10,710 12,247 $ 10,232
Interest Income Recognized 361 292 269
Interest Income Recognized Cash Basis 97 188 $ 135
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 509 604  
With no related allowance recorded, Unpaid Principal Balance 509 604  
With no related allowance recorded, Average Recorded Investment 355 456  
With no related allowance recorded, Interest Income Recognized 5 5  
With no related allowance recorded, Interest Income Recognized Cash Basis 12 15  
With a specific allowance recorded, Recorded Investment 60    
With a specific allowance recorded, Unpaid Principal Balance 60    
Related Allowance 6    
With a specific allowance recorded, Average Recorded Investment 15 59  
With a specific allowance recorded, Interest Income Recognized Cash Basis 1    
Recorded Investment 569 604  
Unpaid Principal Balance 569 604  
Average Recorded Investment 370 515  
Interest Income Recognized 5 5  
Interest Income Recognized Cash Basis 13 15  
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2,280 423  
With no related allowance recorded, Unpaid Principal Balance 2,385 423  
With no related allowance recorded, Average Recorded Investment 2,048 1,000  
With no related allowance recorded, Interest Income Recognized 25 33  
With no related allowance recorded, Interest Income Recognized Cash Basis 6    
With a specific allowance recorded, Recorded Investment   6,302  
With a specific allowance recorded, Unpaid Principal Balance   6,406  
Related Allowance   691  
With a specific allowance recorded, Average Recorded Investment 1,388 5,414  
With a specific allowance recorded, Interest Income Recognized   54  
Recorded Investment 2,280 6,725  
Unpaid Principal Balance 2,385 6,829  
Average Recorded Investment 3,436 6,414  
Interest Income Recognized 25 87  
Interest Income Recognized Cash Basis 6    
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 152    
With no related allowance recorded, Unpaid Principal Balance 152    
With no related allowance recorded, Average Recorded Investment 588 143  
With no related allowance recorded, Interest Income Recognized   18  
With no related allowance recorded, Interest Income Recognized Cash Basis 2 3  
With a specific allowance recorded, Recorded Investment   20  
With a specific allowance recorded, Unpaid Principal Balance   20  
Related Allowance   1  
With a specific allowance recorded, Average Recorded Investment   94  
Recorded Investment 152 20  
Unpaid Principal Balance 152 20  
Average Recorded Investment 588 237  
Interest Income Recognized   18  
Interest Income Recognized Cash Basis 2 3  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,234 180  
With no related allowance recorded, Unpaid Principal Balance 1,272 180  
With no related allowance recorded, Average Recorded Investment 1,252 1,445  
With no related allowance recorded, Interest Income Recognized 29 70  
With no related allowance recorded, Interest Income Recognized Cash Basis 43 9  
With a specific allowance recorded, Recorded Investment 2,874 3,381  
With a specific allowance recorded, Unpaid Principal Balance 2,874 3,381  
Related Allowance 438 664  
With a specific allowance recorded, Average Recorded Investment 3,176 2,199  
With a specific allowance recorded, Interest Income Recognized 150 70  
With a specific allowance recorded, Interest Income Recognized Cash Basis   3  
Recorded Investment 4,108 3,561  
Unpaid Principal Balance 4,146 3,561  
Average Recorded Investment 4,428 3,644  
Interest Income Recognized 179 140  
Interest Income Recognized Cash Basis 43    
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 17 21  
With no related allowance recorded, Unpaid Principal Balance 417 21  
With no related allowance recorded, Average Recorded Investment 135 920  
With no related allowance recorded, Interest Income Recognized 2 24  
With no related allowance recorded, Interest Income Recognized Cash Basis 10 158  
With a specific allowance recorded, Recorded Investment 1,564 982  
With a specific allowance recorded, Unpaid Principal Balance 1,564 982  
Related Allowance 1,551 825  
With a specific allowance recorded, Average Recorded Investment 1,736 498  
With a specific allowance recorded, Interest Income Recognized 149 17  
With a specific allowance recorded, Interest Income Recognized Cash Basis 23    
Recorded Investment 1,581 1,003  
Unpaid Principal Balance 1,981 1,003  
Average Recorded Investment 1,871 1,418  
Interest Income Recognized 151 41  
Interest Income Recognized Cash Basis 33 158  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2 26  
With no related allowance recorded, Unpaid Principal Balance 2 26  
With no related allowance recorded, Average Recorded Investment 15 17  
With no related allowance recorded, Interest Income Recognized 1    
With a specific allowance recorded, Recorded Investment 165    
With a specific allowance recorded, Unpaid Principal Balance 165    
Related Allowance 1 3  
With a specific allowance recorded, Average Recorded Investment 2 2  
With a specific allowance recorded, Interest Income Recognized   1  
Recorded Investment 167 26  
Unpaid Principal Balance 167 26  
Average Recorded Investment 17 19  
Interest Income Recognized $ 1 $ 1