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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 1,914 $ 1,808 $ 1,841 $ 1,914 $ 1,841 $ 1,808
With a specific allowance recorded, Recorded Investment 1,314 246 970 1,314 970 246
Related Allowance 187 31 148 187 148 31
Recorded Investment 3,228 2,054 2,811 3,228 2,811 2,054
Average Recorded Investment 3,141 $ 2,533 2,158 2,492 1,765 $ 1,958
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 626   589 626 589  
With no related allowance recorded, Unpaid Principal Balance 626   589 626 589  
With no related allowance recorded, Average Recorded Investment 628   645 625 554  
With no related allowance recorded, Interest Income Recognized 9   9 24 23  
With no related allowance recorded, Interest Income Recognized Cash Basis 3   5 7 15  
With a specific allowance recorded, Recorded Investment 126   174 126 174  
With a specific allowance recorded, Unpaid Principal Balance 128   174 128 174  
Related Allowance 22   26 22 26  
With a specific allowance recorded, Average Recorded Investment 172   227 220 153  
Recorded Investment 752   763 752 763  
Unpaid Principal Balance 754   763 754 763  
Average Recorded Investment 800   872 845 707  
Interest Income Recognized 9   9 24 23  
Interest Income Recognized Cash Basis 3   5 7 15  
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 406     406    
With no related allowance recorded, Unpaid Principal Balance 406     406    
With no related allowance recorded, Average Recorded Investment 406     135 22  
Recorded Investment 406     406    
Unpaid Principal Balance 406     406    
Average Recorded Investment 406     135 22  
Agricultural [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 368     368    
With no related allowance recorded, Unpaid Principal Balance 368     368    
With no related allowance recorded, Average Recorded Investment 368     123    
With a specific allowance recorded, Average Recorded Investment       24    
Recorded Investment 368     368    
Unpaid Principal Balance 368     368    
Average Recorded Investment 368     147    
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 304   196 304 196  
With no related allowance recorded, Unpaid Principal Balance 304   196 304 196  
With no related allowance recorded, Average Recorded Investment 267   197 217 199  
With no related allowance recorded, Interest Income Recognized 7   3 14 8  
With a specific allowance recorded, Average Recorded Investment         186  
With a specific allowance recorded, Interest Income Recognized 14          
Recorded Investment 304   196 304 196  
Unpaid Principal Balance 304   196 304 196  
Average Recorded Investment 267   197 217 385  
Interest Income Recognized 21   3 14 8  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 210   1,056 210 1,056  
With no related allowance recorded, Unpaid Principal Balance 210   1,056 210 1,056  
With no related allowance recorded, Average Recorded Investment 219   504 697 238  
With no related allowance recorded, Interest Income Recognized 3   12 9 12  
With a specific allowance recorded, Recorded Investment 1,188   796 1,188 796  
With a specific allowance recorded, Unpaid Principal Balance 1,188   796 1,188 796  
Related Allowance 165   122 165 122  
With a specific allowance recorded, Average Recorded Investment 1,081   585 451 413  
With a specific allowance recorded, Interest Income Recognized     3 37 11  
Recorded Investment 1,398   1,852 1,398 1,852  
Unpaid Principal Balance 1,398   1,852 1,398 1,852  
Average Recorded Investment 1,300   1,089 1,148 651  
Interest Income Recognized $ 3   $ 15 $ 46 $ 23