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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 1,141 $ 1,257  
With a specific allowance recorded, Recorded Investment 711 879  
With a specific allowance recorded, Related Allowance 135 330  
Recorded Investment 1,852 2,136  
Related Allowance 135 330  
Average Recorded Investment 1,802 2,509 $ 1,929
Interest Income Recognized 64 96 87
Interest Income Recognized Cash Basis 27 60 $ 51
Agricultural Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 132 63  
With no related allowance recorded, Unpaid Principal Balance 132 63  
With no related allowance recorded, Average Recorded Investment 147 120  
With a specific allowance recorded, Average Recorded Investment 9    
Recorded Investment 132 63  
Unpaid Principal Balance 132 63  
Average Recorded Investment 156 120  
Consumer Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,009 156  
With no related allowance recorded, Unpaid Principal Balance 1,009 156  
With no related allowance recorded, Average Recorded Investment 101 158  
With no related allowance recorded, Interest Income Recognized 16 5  
With no related allowance recorded, Interest Income Recognized Cash Basis 4 5  
With a specific allowance recorded, Recorded Investment 94 275  
With a specific allowance recorded, Unpaid Principal Balance 94 323  
With a specific allowance recorded, Related Allowance 34 64  
With a specific allowance recorded, Average Recorded Investment 344 181  
With a specific allowance recorded, Interest Income Recognized   7  
With a specific allowance recorded, Interest Income Recognized Cash Basis   6  
Recorded Investment 1,103 431  
Unpaid Principal Balance 1,103 479  
Related Allowance 34 64  
Average Recorded Investment 445 339  
Interest Income Recognized 16 12  
Interest Income Recognized Cash Basis 4 11  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment   1,038  
With no related allowance recorded, Unpaid Principal Balance   1,038  
With no related allowance recorded, Average Recorded Investment 427 421  
With no related allowance recorded, Interest Income Recognized 24 27  
With no related allowance recorded, Interest Income Recognized Cash Basis 23 27  
With a specific allowance recorded, Recorded Investment 501 422  
With a specific allowance recorded, Unpaid Principal Balance 501 422  
With a specific allowance recorded, Related Allowance 66 152  
With a specific allowance recorded, Average Recorded Investment 191 907  
With a specific allowance recorded, Interest Income Recognized   30  
With a specific allowance recorded, Interest Income Recognized Cash Basis   22  
Recorded Investment 501 1,460  
Unpaid Principal Balance 501 1,460  
Related Allowance 66 152  
Average Recorded Investment 618 1,328  
Interest Income Recognized 24 57  
Interest Income Recognized Cash Basis 23 49  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
With a specific allowance recorded, Average Recorded Investment   2  
Average Recorded Investment   2  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 337 429  
With no related allowance recorded, Interest Income Recognized   27  
With a specific allowance recorded, Recorded Investment 116 182  
With a specific allowance recorded, Unpaid Principal Balance 116 182  
With a specific allowance recorded, Related Allowance 35 114  
With a specific allowance recorded, Average Recorded Investment 246 291  
With a specific allowance recorded, Interest Income Recognized 24    
Recorded Investment 116 182  
Unpaid Principal Balance 116 182  
Related Allowance 35 114  
Average Recorded Investment 583 720  
Interest Income Recognized $ 24 $ 27