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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 5,172 $ 2,420  
With a specific allowance recorded, Recorded Investment 9,360 641  
Related Allowance 1,657 197  
Recorded Investment 14,532 3,061  
Average Recorded Investment 10,234 2,649 $ 1,958
Interest Income Recognized 269 118 69
Interest Income Recognized Cash Basis 135 9 $ 17
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 799 648  
With no related allowance recorded, Unpaid Principal Balance 799 648  
With no related allowance recorded, Average Recorded Investment 738 626  
With no related allowance recorded, Interest Income Recognized 22 32  
With no related allowance recorded, Interest Income Recognized Cash Basis 10 9  
With a specific allowance recorded, Recorded Investment 202 181  
With a specific allowance recorded, Unpaid Principal Balance 202 184  
Related Allowance 31 30  
With a specific allowance recorded, Average Recorded Investment 126 211  
With a specific allowance recorded, Interest Income Recognized Cash Basis 3    
Recorded Investment 1,001 829  
Unpaid Principal Balance 1,001 832  
Average Recorded Investment 864 837  
Interest Income Recognized 22 32  
Interest Income Recognized Cash Basis 13 9  
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,546    
With no related allowance recorded, Unpaid Principal Balance 1,549    
With no related allowance recorded, Average Recorded Investment 729 204  
With no related allowance recorded, Interest Income Recognized 18    
With no related allowance recorded, Interest Income Recognized Cash Basis 12    
With a specific allowance recorded, Recorded Investment 5,210    
With a specific allowance recorded, Unpaid Principal Balance 5,210    
Related Allowance 600    
With a specific allowance recorded, Average Recorded Investment 3,175 22  
With a specific allowance recorded, Interest Income Recognized 6 1  
With a specific allowance recorded, Interest Income Recognized Cash Basis 102    
Recorded Investment 6,756    
Unpaid Principal Balance 6,759    
Average Recorded Investment 3,904 226  
Interest Income Recognized 24 1  
Interest Income Recognized Cash Basis 114    
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 291 491  
With no related allowance recorded, Unpaid Principal Balance 291 491  
With no related allowance recorded, Average Recorded Investment 392 124  
With no related allowance recorded, Interest Income Recognized 3    
With no related allowance recorded, Interest Income Recognized Cash Basis 3    
With a specific allowance recorded, Recorded Investment 176 200  
With a specific allowance recorded, Unpaid Principal Balance 176 200  
Related Allowance 116 21  
With a specific allowance recorded, Average Recorded Investment 188 29  
Recorded Investment 467 691  
Unpaid Principal Balance 467 691  
Average Recorded Investment 580 153  
Interest Income Recognized 3    
Interest Income Recognized Cash Basis 3    
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 185 299  
With no related allowance recorded, Unpaid Principal Balance 185 299  
With no related allowance recorded, Average Recorded Investment 195 238  
With no related allowance recorded, Interest Income Recognized 13 19  
With a specific allowance recorded, Recorded Investment 2,765    
With a specific allowance recorded, Unpaid Principal Balance 2,765    
Related Allowance 20    
With a specific allowance recorded, Average Recorded Investment 2,524    
With a specific allowance recorded, Interest Income Recognized 128    
Recorded Investment 2,950 299  
Unpaid Principal Balance 2,950 299  
Average Recorded Investment 2,719 238  
Interest Income Recognized 141 19  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2,328 982  
With no related allowance recorded, Unpaid Principal Balance 2,328 982  
With no related allowance recorded, Average Recorded Investment 1,222 637  
With no related allowance recorded, Interest Income Recognized 26 66  
With no related allowance recorded, Interest Income Recognized Cash Basis 5    
With a specific allowance recorded, Recorded Investment 1,007 227  
With a specific allowance recorded, Unpaid Principal Balance 1,007 377  
Related Allowance 890 142  
With a specific allowance recorded, Average Recorded Investment 916 555  
With a specific allowance recorded, Interest Income Recognized 52    
Recorded Investment 3,335 1,209  
Unpaid Principal Balance 3,335 1,359  
Average Recorded Investment 2,138 1,192  
Interest Income Recognized 78 66  
Interest Income Recognized Cash Basis 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 16    
With a specific allowance recorded, Recorded Investment   33  
With a specific allowance recorded, Unpaid Principal Balance   33  
Related Allowance   4  
With a specific allowance recorded, Average Recorded Investment 11 3  
With a specific allowance recorded, Interest Income Recognized 1    
Recorded Investment 23 33  
Unpaid Principal Balance 23 33  
Average Recorded Investment 27 $ 3  
Interest Income Recognized $ 1