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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, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 1,042 $ 1,257 $ 624 $ 1,257
With a specific allowance recorded, Related Allowance 426 330 428 330
With a specific allowance recorded, Recorded Investment 1,169 879 1,619 879
Related Allowance 426 330 428 330
Recorded Investment 2,211 2,136 2,243 2,136
Related Allowance 426 330 428 330
Average Recorded Investment 2,130 $ 2,207 1,958 $ 2,509
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 162   157  
With no related allowance recorded, Unpaid Principal Balance 162   157  
With a specific allowance recorded, Related Allowance 57      
With no related allowance recorded, Average Recorded Investment 162   173  
With a specific allowance recorded, Recorded Investment 57      
With a specific allowance recorded, Unpaid Principal Balance 57      
Related Allowance 57      
With a specific allowance recorded, Average Recorded Investment 38      
With a specific allowance recorded, Interest Income Recognized 1      
Recorded Investment 219      
Unpaid Principal Balance 219      
Related Allowance 57      
Average Recorded Investment 200      
Interest Income Recognized 1      
Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
With a specific allowance recorded, Related Allowance     24  
With a specific allowance recorded, Recorded Investment     24  
With a specific allowance recorded, Unpaid Principal Balance     24  
Related Allowance     24  
With a specific allowance recorded, Average Recorded Investment     24  
Recorded Investment     24  
Unpaid Principal Balance     24  
Related Allowance     24  
Average Recorded Investment     24  
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 365      
With no related allowance recorded, Unpaid Principal Balance 365      
With a specific allowance recorded, Related Allowance 104   35  
With no related allowance recorded, Average Recorded Investment 156      
With no related allowance recorded, Interest Income Recognized 3      
With no related allowance recorded, Interest Income Recognized Cash Basis 3      
With a specific allowance recorded, Recorded Investment 509   96  
With a specific allowance recorded, Unpaid Principal Balance 628   96  
Related Allowance 104   35  
With a specific allowance recorded, Average Recorded Investment 307   96  
With a specific allowance recorded, Interest Income Recognized 1   3  
With a specific allowance recorded, Interest Income Recognized Cash Basis     3  
Recorded Investment 874   253  
Unpaid Principal Balance 993   253  
Related Allowance 104   35  
Average Recorded Investment 463   269  
Interest Income Recognized 4   3  
Interest Income Recognized Cash Basis 3   3  
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 515      
With no related allowance recorded, Unpaid Principal Balance 515      
With a specific allowance recorded, Related Allowance 152   131  
With no related allowance recorded, Average Recorded Investment 409      
With no related allowance recorded, Interest Income Recognized 8      
With no related allowance recorded, Interest Income Recognized Cash Basis 7      
With a specific allowance recorded, Recorded Investment 422   1,139  
With a specific allowance recorded, Unpaid Principal Balance 422   1,139  
Related Allowance 152   131  
With a specific allowance recorded, Average Recorded Investment 422   852  
Recorded Investment 937   1,139  
Unpaid Principal Balance 937   1,139  
Related Allowance 152   131  
Average Recorded Investment 831   852  
Interest Income Recognized 8      
Interest Income Recognized Cash Basis 7      
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment     467  
With no related allowance recorded, Unpaid Principal Balance     467  
With no related allowance recorded, Average Recorded Investment     469  
With no related allowance recorded, Interest Income Recognized     7  
With a specific allowance recorded, Average Recorded Investment     7  
Average Recorded Investment     7  
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With a specific allowance recorded, Related Allowance 113   238  
With no related allowance recorded, Average Recorded Investment 454      
With no related allowance recorded, Interest Income Recognized 6      
With a specific allowance recorded, Recorded Investment 181   360  
With a specific allowance recorded, Unpaid Principal Balance 239   360  
Related Allowance 113   238  
With a specific allowance recorded, Average Recorded Investment 182   337  
Recorded Investment 181   827  
Unpaid Principal Balance 239   827  
Related Allowance 113   238  
Average Recorded Investment 636   806  
Interest Income Recognized $ 6   $ 7