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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, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 1,024 $ 1,141 $ 997 $ 1,024 $ 997 $ 1,141
With a specific allowance recorded, Recorded Investment 691 711 622 691 622 711
Related Allowance 115 135 217 115 217 135
Recorded Investment 1,715 1,852 1,619 1,715 1,619 1,852
Related Allowance 115 135 217 115 217 135
Average Recorded Investment 1,744 $ 1,684 1,899 1,789 1,995 $ 1,802
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 101   162 101 162  
With no related allowance recorded, Unpaid Principal Balance 101   162 101 162  
With no related allowance recorded, Average Recorded Investment 101   162 111 162  
With no related allowance recorded, Interest Income Recognized         1  
Recorded Investment 101   162 101 162  
Unpaid Principal Balance 101   162 101 162  
Average Recorded Investment 101   162 111 162  
Interest Income Recognized         1  
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 923   40 923 40  
With no related allowance recorded, Unpaid Principal Balance 923   40 923 40  
With no related allowance recorded, Average Recorded Investment 948   25 976 91  
With no related allowance recorded, Interest Income Recognized 8     16    
With no related allowance recorded, Interest Income Recognized Cash Basis 6     12    
With a specific allowance recorded, Recorded Investment 85   414 85 414  
With a specific allowance recorded, Unpaid Principal Balance 85   414 85 414  
Related Allowance 25   61 25 61  
With a specific allowance recorded, Average Recorded Investment 87   478 90 392  
With a specific allowance recorded, Interest Income Recognized     7   11  
With a specific allowance recorded, Interest Income Recognized Cash Basis     6   9  
Recorded Investment 1,008   454 1,008 454  
Unpaid Principal Balance 1,008   454 1,008 454  
Related Allowance 25   61 25 61  
Average Recorded Investment 1,035   503 1,066 483  
Interest Income Recognized 8   7 16 11  
Interest Income Recognized Cash Basis 6   6 12 9  
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     346   346  
With no related allowance recorded, Unpaid Principal Balance     346   346  
With no related allowance recorded, Average Recorded Investment     346   378  
With no related allowance recorded, Interest Income Recognized     6   14  
With no related allowance recorded, Interest Income Recognized Cash Basis     6   13  
With a specific allowance recorded, Recorded Investment 492   90 492 90  
With a specific allowance recorded, Unpaid Principal Balance 492   90 492 90  
Related Allowance 57   90 57 90  
With a specific allowance recorded, Average Recorded Investment 493   311 496 366  
With a specific allowance recorded, Interest Income Recognized 7     13    
Recorded Investment 492   436 492 436  
Unpaid Principal Balance 492   436 492 436  
Related Allowance 57   90 57 90  
Average Recorded Investment 493   657 496 744  
Interest Income Recognized 7   6 13 14  
Interest Income Recognized Cash Basis     6   13  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     449   449  
With no related allowance recorded, Unpaid Principal Balance     449   449  
With no related allowance recorded, Average Recorded Investment     450   452  
With no related allowance recorded, Interest Income Recognized     6   12  
With a specific allowance recorded, Recorded Investment 114   118 114 118  
With a specific allowance recorded, Unpaid Principal Balance 114   118 114 118  
Related Allowance 33   66 33 66  
With a specific allowance recorded, Average Recorded Investment 115   127 116 154  
Recorded Investment 114   567 114 567  
Unpaid Principal Balance 114   567 114 567  
Related Allowance 33   66 33 66  
Average Recorded Investment $ 115   577 $ 116 606  
Interest Income Recognized     $ 6   $ 12