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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 1,808 $ 1,131  
With a specific allowance recorded, Recorded Investment 246 614  
Related Allowance 31 106  
Recorded Investment 2,054 1,745  
Average Recorded Investment 1,958 1,885 $ 1,802
Interest Income Recognized 69 57 64
Interest Income Recognized Cash Basis 17 23 $ 27
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 583 495  
With no related allowance recorded, Unpaid Principal Balance 583 495  
With no related allowance recorded, Average Recorded Investment 562 911  
With no related allowance recorded, Interest Income Recognized 31 30  
With no related allowance recorded, Interest Income Recognized Cash Basis 17 21  
With a specific allowance recorded, Recorded Investment 174 80  
With a specific allowance recorded, Unpaid Principal Balance 174 80  
Related Allowance 26 21  
With a specific allowance recorded, Average Recorded Investment 158 88  
Recorded Investment 757 575  
Unpaid Principal Balance 757 575  
Average Recorded Investment 720 999  
Interest Income Recognized 31 30  
Interest Income Recognized Cash Basis 17 21  
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 17 123  
Recorded Investment   101  
Unpaid Principal Balance   101  
Average Recorded Investment 17 123  
Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment   27  
Average Recorded Investment   27  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 194 202  
With no related allowance recorded, Unpaid Principal Balance 194 202  
With no related allowance recorded, Average Recorded Investment 198 51  
With no related allowance recorded, Interest Income Recognized 11 1  
With a specific allowance recorded, Recorded Investment   423  
With a specific allowance recorded, Unpaid Principal Balance   423  
Related Allowance   46  
With a specific allowance recorded, Average Recorded Investment 140 486  
With a specific allowance recorded, Interest Income Recognized   24  
With a specific allowance recorded, Interest Income Recognized Cash Basis   2  
Recorded Investment 194 625  
Unpaid Principal Balance 194 625  
Average Recorded Investment 338 537  
Interest Income Recognized 11 25  
Interest Income Recognized Cash Basis   2  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,031 333  
With no related allowance recorded, Unpaid Principal Balance 1,031 333  
With no related allowance recorded, Average Recorded Investment 438 85  
With no related allowance recorded, Interest Income Recognized 25 2  
With a specific allowance recorded, Recorded Investment 72 111  
With a specific allowance recorded, Unpaid Principal Balance 72 111  
Related Allowance 5 39  
With a specific allowance recorded, Average Recorded Investment 445 114  
With a specific allowance recorded, Interest Income Recognized 2    
Recorded Investment 1,103 444  
Unpaid Principal Balance 1,103 444  
Average Recorded Investment 883 199  
Interest Income Recognized $ 27 $ 2