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Loans - (Additional Information Regarding Impaired Loans) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Loans [Line Items]    
Unpaid principal balance, Total $ 38,069 $ 34,813
Recorded Investment In Acquired Impaired Loans 37,363 32,091
Loans and Leases Receivable, Allowance 4,388 279
Commercial Loan [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 10,812 16,953
Recorded investment with no related allowance recorded 10,744 16,771
Unpaid principal balance of impaired loans with an allowance recorded 10,816 894
Recorded investment of impaired loans with an allowance recorded 10,764 693
Allowance for loan losses allocated with an allowance recorded 4,045 82
Agriculture [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,877 3,065
Recorded investment with no related allowance recorded 1,878 3,061
Unpaid principal balance of impaired loans with an allowance recorded 254 177
Recorded investment of impaired loans with an allowance recorded 248 145
Allowance for loan losses allocated with an allowance recorded 1  
Commercial Construction [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 190  
Recorded investment with no related allowance recorded 188  
Multifamily [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 61  
Recorded investment of impaired loans with an allowance recorded 59  
Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 2,218 1,164
Recorded investment with no related allowance recorded 2,150 970
Unpaid principal balance of impaired loans with an allowance recorded 1,272 1,321
Recorded investment of impaired loans with an allowance recorded 1,117 1,024
Allowance for loan losses allocated with an allowance recorded 2 5
Non Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 154  
Recorded investment with no related allowance recorded 153  
Unpaid principal balance of impaired loans with an allowance recorded 1,642 1,140
Recorded investment of impaired loans with an allowance recorded 1,630 1,060
Allowance for loan losses allocated with an allowance recorded 274 9
Total Commercial Real Estate [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 2,562 1,164
Recorded investment with no related allowance recorded 2,491 970
Unpaid principal balance of impaired loans with an allowance recorded 2,975 2,461
Recorded investment of impaired loans with an allowance recorded 2,806 2,084
Allowance for loan losses allocated with an allowance recorded 277 14
Sr Lien 1-4 Family Closed End [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 947 694
Recorded investment with no related allowance recorded 941 248
Unpaid principal balance of impaired loans with an allowance recorded 5,826 7,360
Recorded investment of impaired loans with an allowance recorded 5,701 6,359
Allowance for loan losses allocated with an allowance recorded 54 172
Jr Lien 1-4 Family Closed End [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 113  
Recorded investment with no related allowance recorded 112  
Unpaid principal balance of impaired loans with an allowance recorded 1,800 1,768
Recorded investment of impaired loans with an allowance recorded 1,593 1,515
Allowance for loan losses allocated with an allowance recorded 11 9
Residential Real Estate Segment [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,060 694
Recorded investment with no related allowance recorded 1,052 248
Unpaid principal balance of impaired loans with an allowance recorded 7,627 9,128
Recorded investment of impaired loans with an allowance recorded 7,294 7,874
Allowance for loan losses allocated with an allowance recorded 65 181
Consumer [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 86 277
Recorded investment of impaired loans with an allowance recorded 86 245
Allowance for loan losses allocated with an allowance recorded 1 2
Impaired Loans With No Related Allowance Recorded [Member] [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 16,311 21,876
Recorded investment with no related allowance recorded 16,165 21,050
Impaired Loans with Related Allowance Recorded [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 21,758 12,937
Recorded investment of impaired loans with an allowance recorded 21,198 11,041
Allowance for loan losses allocated with an allowance recorded $ 4,388 $ 279