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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 804 $ 1,131 $ 1,024 $ 804 $ 1,024 $ 1,131
With a specific allowance recorded, Recorded Investment 648 614 691 648 691 614
Related Allowance 132 106 115 132 115 106
Recorded Investment 1,452 1,745 1,715 1,452 1,715 1,745
Average Recorded Investment 1,452 $ 2,160 1,744 1,570 1,789 $ 1,885
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     101   101  
With no related allowance recorded, Unpaid Principal Balance     101   101  
With no related allowance recorded, Average Recorded Investment     101 34 111  
Recorded Investment     101   101  
Unpaid Principal Balance     101   101  
Average Recorded Investment     101 34 111  
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 606   923 606 923  
With no related allowance recorded, Unpaid Principal Balance 606   923 606 923  
With no related allowance recorded, Average Recorded Investment 526   948 509 976  
With no related allowance recorded, Interest Income Recognized 6   8 14 16  
With no related allowance recorded, Interest Income Recognized Cash Basis 4   6 10 12  
With a specific allowance recorded, Recorded Investment 254   85 254 85  
With a specific allowance recorded, Unpaid Principal Balance 254   85 254 85  
Related Allowance 46   25 46 25  
With a specific allowance recorded, Average Recorded Investment 152   87 116 90  
Recorded Investment 860   1,008 860 1,008  
Unpaid Principal Balance 860   1,008 860 1,008  
Average Recorded Investment 678   1,035 625 1,066  
Interest Income Recognized 6   8 14 16  
Interest Income Recognized Cash Basis 4   6 10 12  
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 198     198    
With no related allowance recorded, Unpaid Principal Balance 198     198    
With no related allowance recorded, Average Recorded Investment 199     200    
With no related allowance recorded, Interest Income Recognized 3     5    
With a specific allowance recorded, Recorded Investment     492   492  
With a specific allowance recorded, Unpaid Principal Balance     492   492  
Related Allowance     57   57  
With a specific allowance recorded, Average Recorded Investment 139   493 279 496  
With a specific allowance recorded, Interest Income Recognized     7   13  
Recorded Investment 198   492 198 492  
Unpaid Principal Balance 198   492 198 492  
Average Recorded Investment 338   493 479 496  
Interest Income Recognized 3   7 5 13  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Average Recorded Investment       104    
With a specific allowance recorded, Recorded Investment 394   114 394 114  
With a specific allowance recorded, Unpaid Principal Balance 394   114 394 114  
Related Allowance 86   33 86 33  
With a specific allowance recorded, Average Recorded Investment 436   115 328 116  
With a specific allowance recorded, Interest Income Recognized 4     8    
Recorded Investment 394   114 394 114  
Unpaid Principal Balance 394   114 394 114  
Average Recorded Investment 436   $ 115 432 $ 116  
Interest Income Recognized $ 4     $ 8