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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 1,841 $ 1,131 $ 1,294 $ 1,841 $ 1,294 $ 1,131
With a specific allowance recorded, Recorded Investment 970 614 685 970 685 614
Related Allowance 148 106 123 148 123 106
Recorded Investment 2,811 1,745 1,979 2,811 1,979 1,745
Average Recorded Investment 2,158 $ 2,160 1,804 1,765 1,793 $ 1,885
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 589   928 589 928  
With no related allowance recorded, Unpaid Principal Balance 589   928 589 928  
With no related allowance recorded, Average Recorded Investment 645   926 554 959  
With no related allowance recorded, Interest Income Recognized 9   8 23 25  
With no related allowance recorded, Interest Income Recognized Cash Basis 5   5 15 17  
With a specific allowance recorded, Recorded Investment 174   84 174 84  
With a specific allowance recorded, Unpaid Principal Balance 174   84 174 84  
Related Allowance 26   25 26 25  
With a specific allowance recorded, Average Recorded Investment 227   85 153 89  
Recorded Investment 763   1,012 763 1,012  
Unpaid Principal Balance 763   1,012 763 1,012  
Average Recorded Investment 872   1,011 707 1,048  
Interest Income Recognized 9   8 23 25  
Interest Income Recognized Cash Basis 5   5 15 17  
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     205   205  
With no related allowance recorded, Unpaid Principal Balance     205   205  
With no related allowance recorded, Average Recorded Investment     136 22 119  
Recorded Investment     205   205  
Unpaid Principal Balance     205   205  
Average Recorded Investment     136 22 119  
Agricultural [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     161   161  
With no related allowance recorded, Unpaid Principal Balance     161   161  
With no related allowance recorded, Average Recorded Investment     54   18  
Recorded Investment     161   161  
Unpaid Principal Balance     161   161  
Average Recorded Investment     54   18  
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 196     196    
With no related allowance recorded, Unpaid Principal Balance 196     196    
With no related allowance recorded, Average Recorded Investment 197     199    
With no related allowance recorded, Interest Income Recognized 3     8    
With a specific allowance recorded, Recorded Investment     488   488  
With a specific allowance recorded, Unpaid Principal Balance     488   488  
Related Allowance     67   67  
With a specific allowance recorded, Average Recorded Investment     489 186 493  
With a specific allowance recorded, Interest Income Recognized     5   17  
With a specific allowance recorded, Interest Income Recognized Cash Basis         2  
Recorded Investment 196   488 196 488  
Unpaid Principal Balance 196   488 196 488  
Average Recorded Investment 197   489 385 493  
Interest Income Recognized 3   5 8 17  
Interest Income Recognized Cash Basis         2  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 1,056     1,056    
With no related allowance recorded, Unpaid Principal Balance 1,056     1,056    
With no related allowance recorded, Average Recorded Investment 504     238    
With no related allowance recorded, Interest Income Recognized 12     12    
With a specific allowance recorded, Recorded Investment 796   113 796 113  
With a specific allowance recorded, Unpaid Principal Balance 796   113 796 113  
Related Allowance 122   31 122 31  
With a specific allowance recorded, Average Recorded Investment 585   114 413 115  
With a specific allowance recorded, Interest Income Recognized 3     11    
Recorded Investment 1,852   113 1,852 113  
Unpaid Principal Balance 1,852   113 1,852 113  
Average Recorded Investment 1,089   $ 114 651 $ 115  
Interest Income Recognized $ 15     $ 23