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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 999 $ 1,131 $ 1,099 $ 1,131
With a specific allowance recorded, Recorded Investment 607 614 694 614
Related Allowance 104 106 117 106
Recorded Investment 1,606 1,745 1,793 1,745
Related Allowance 104 106 117 106
Average Recorded Investment 1,688 $ 2,160 1,832 $ 1,885
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment     101  
With no related allowance recorded, Unpaid Principal Balance     101  
With no related allowance recorded, Average Recorded Investment 67   121  
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Recorded Investment     101  
Unpaid Principal Balance     101  
Average Recorded Investment 67   121  
Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 489   998  
With no related allowance recorded, Unpaid Principal Balance 489   998  
With no related allowance recorded, Average Recorded Investment 492   1,003  
With no related allowance recorded, Interest Income Recognized 8   8  
With no related allowance recorded, Interest Income Recognized Cash Basis 6   6  
With a specific allowance recorded, Recorded Investment 80   83  
With a specific allowance recorded, Unpaid Principal Balance 80   83  
Related Allowance 20   23  
With a specific allowance recorded, Average Recorded Investment 80   94  
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Recorded Investment 569   1,081  
Unpaid Principal Balance 569   1,081  
Related Allowance 20   23  
Average Recorded Investment 572   1,097  
Interest Income Recognized 8   8  
Interest Income Recognized Cash Basis 6   6  
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 200      
With no related allowance recorded, Unpaid Principal Balance 200      
With no related allowance recorded, Average Recorded Investment 201      
With no related allowance recorded, Interest Income Recognized 3      
With a specific allowance recorded, Recorded Investment 418   496  
With a specific allowance recorded, Unpaid Principal Balance 418   496  
Related Allowance 42   61  
With a specific allowance recorded, Average Recorded Investment 420   498  
With a specific allowance recorded, Interest Income Recognized 4   5  
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Recorded Investment 618   496  
Unpaid Principal Balance 618   496  
Related Allowance 42   61  
Average Recorded Investment 621   498  
Interest Income Recognized 7   5  
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 310      
With no related allowance recorded, Unpaid Principal Balance 310      
With no related allowance recorded, Average Recorded Investment 209      
With no related allowance recorded, Interest Income Recognized 4      
With a specific allowance recorded, Recorded Investment 109   115  
With a specific allowance recorded, Unpaid Principal Balance 109   115  
Related Allowance 42   33  
With a specific allowance recorded, Average Recorded Investment 219   116  
With a specific allowance recorded, Interest Income Recognized Cash Basis 0   0  
Recorded Investment 419   115  
Unpaid Principal Balance 419   115  
Related Allowance 42   33  
Average Recorded Investment 428   $ 116  
Interest Income Recognized $ 4