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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, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 997 $ 1,257 $ 3,239 $ 997 $ 3,239 $ 1,257
With a specific allowance recorded, Recorded Investment 622 879 1,783 622 1,783 879
With a specific allowance recorded, Related Allowance 217 330 475 217 475 330
Recorded Investment 1,619 2,136 5,022 1,619 5,022 2,136
Related Allowance 217 330 475 217 475 330
Average Recorded Investment 1,899 $ 2,207 3,435 1,995 2,451 $ 2,509
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 162   222 162 222  
With no related allowance recorded, Unpaid Principal Balance 162   222 162 222  
With no related allowance recorded, Average Recorded Investment 162   74 162 37  
With no related allowance recorded, Interest Income Recognized       1    
Recorded Investment 162   222 162 222  
Unpaid Principal Balance 162   222 162 222  
Average Recorded Investment 162   74 162 37  
Interest Income Recognized       1    
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 40   557 40 557  
With no related allowance recorded, Unpaid Principal Balance 40   557 40 557  
With no related allowance recorded, Average Recorded Investment 25   145 91 159  
With a specific allowance recorded, Recorded Investment 414   121 414 121  
With a specific allowance recorded, Unpaid Principal Balance 414   121 414 121  
With a specific allowance recorded, Related Allowance 61   39 61 39  
With a specific allowance recorded, Average Recorded Investment 478   120 392 108  
With a specific allowance recorded, Interest Income Recognized 7     11    
With a specific allowance recorded, Interest Income Recognized Cash Basis 6   1 9 4  
Recorded Investment 454   678 454 678  
Unpaid Principal Balance 454   678 454 678  
Related Allowance 61   39 61 39  
Average Recorded Investment 503   265 483 267  
Interest Income Recognized 7     11    
Interest Income Recognized Cash Basis 6   1 9 4  
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 346   1,460 346 1,460  
With no related allowance recorded, Unpaid Principal Balance 346   1,546 346 1,546  
With no related allowance recorded, Average Recorded Investment 346   634 378 317  
With no related allowance recorded, Interest Income Recognized 6     14    
With no related allowance recorded, Interest Income Recognized Cash Basis 6   9 13 9  
With a specific allowance recorded, Recorded Investment 90   1,339 90 1,339  
With a specific allowance recorded, Unpaid Principal Balance 90   1,339 90 1,339  
With a specific allowance recorded, Related Allowance 90   235 90 235  
With a specific allowance recorded, Average Recorded Investment 311   1,340 366 1,096  
With a specific allowance recorded, Interest Income Recognized     7   8  
Recorded Investment 436   2,799 436 2,799  
Unpaid Principal Balance 436   2,885 436 2,885  
Related Allowance 90   235 90 235  
Average Recorded Investment 657   1,974 744 1,413  
Interest Income Recognized 6   7 14 8  
Interest Income Recognized Cash Basis 6   9 13 9  
Consumer [Member]            
Financing Receivable, Impaired [Line Items]            
With a specific allowance recorded, Average Recorded Investment         4  
Average Recorded Investment         4  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 449   1,000 449 1,000  
With no related allowance recorded, Unpaid Principal Balance 449   1,364 449 1,364  
With no related allowance recorded, Average Recorded Investment 450   798 452 399  
With no related allowance recorded, Interest Income Recognized 6   13 12 13  
With a specific allowance recorded, Recorded Investment 118   323 118 323  
With a specific allowance recorded, Unpaid Principal Balance 118   323 118 323  
With a specific allowance recorded, Related Allowance 66   201 66 201  
With a specific allowance recorded, Average Recorded Investment 127   324 154 331  
Recorded Investment 567   1,323 567 1,323  
Unpaid Principal Balance 567   1,687 567 1,687  
Related Allowance 66   201 66 201  
Average Recorded Investment 577   1,122 606 730  
Interest Income Recognized $ 6   $ 13 $ 12 $ 13