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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 2,420 $ 1,808  
With a specific allowance recorded, Recorded Investment 641 246  
Related Allowance 197 31  
Recorded Investment 3,061 2,054  
Average Recorded Investment 2,649 1,958 $ 1,885
Interest Income Recognized 118 69 57
Interest Income Recognized Cash Basis 9 17 $ 23
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 648 583  
With no related allowance recorded, Unpaid Principal Balance 648 583  
With no related allowance recorded, Average Recorded Investment 626 562  
With no related allowance recorded, Interest Income Recognized 32 31  
With no related allowance recorded, Interest Income Recognized Cash Basis 9 17  
With a specific allowance recorded, Recorded Investment 181 174  
With a specific allowance recorded, Unpaid Principal Balance 184 174  
Related Allowance 30 26  
With a specific allowance recorded, Average Recorded Investment 211 158  
Recorded Investment 829 757  
Unpaid Principal Balance 832 757  
Average Recorded Investment 837 720  
Interest Income Recognized 32 31  
Interest Income Recognized Cash Basis 9 17  
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 204 17  
With a specific allowance recorded, Average Recorded Investment 22    
With a specific allowance recorded, Interest Income Recognized 1    
Average Recorded Investment 226 17  
Interest Income Recognized 1    
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 491    
With no related allowance recorded, Unpaid Principal Balance 491    
With no related allowance recorded, Average Recorded Investment 124    
With a specific allowance recorded, Recorded Investment 200    
With a specific allowance recorded, Unpaid Principal Balance 200    
Related Allowance 21    
With a specific allowance recorded, Average Recorded Investment 29    
Recorded Investment 691    
Unpaid Principal Balance 691    
Average Recorded Investment 153    
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 299 194  
With no related allowance recorded, Unpaid Principal Balance 299 194  
With no related allowance recorded, Average Recorded Investment 238 198  
With no related allowance recorded, Interest Income Recognized 19 11  
With a specific allowance recorded, Average Recorded Investment   140  
Recorded Investment 299 194  
Unpaid Principal Balance 299 194  
Average Recorded Investment 238 338  
Interest Income Recognized 19 11  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 982 1,031  
With no related allowance recorded, Unpaid Principal Balance 982 1,031  
With no related allowance recorded, Average Recorded Investment 637 438  
With no related allowance recorded, Interest Income Recognized 66 25  
With a specific allowance recorded, Recorded Investment 227 72  
With a specific allowance recorded, Unpaid Principal Balance 377 72  
Related Allowance 142 5  
With a specific allowance recorded, Average Recorded Investment 555 445  
With a specific allowance recorded, Interest Income Recognized   2  
Recorded Investment 1,209 1,103  
Unpaid Principal Balance 1,359 1,103  
Average Recorded Investment 1,192 883  
Interest Income Recognized 66 $ 27  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
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 3    
Recorded Investment 33    
Unpaid Principal Balance 33    
Average Recorded Investment $ 3