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Loans - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage warehouse $ 144,692 $ 129,156    
Total loans 1,749,131 1,378,554    
Allowance for loan losses (14,534) (16,501) $ (15,992) $ (18,270)
Loans, net 1,734,597 1,362,053    
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 804,995 674,314    
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 437,144 254,625    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 362,300 320,459    
Working Capital and Equipment [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 381,245 300,940    
Real Estate Including Agriculture [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 391,668 343,455    
Tax Exempt Loans Receivable [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 8,674 8,595    
Other Commercial Loans [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 23,408 21,324    
1-4 Family [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 433,015 250,799    
Other Real Estate Loans [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 4,129 3,826    
Auto [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 168,397 154,538    
Recreation Consumer Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 5,365 5,673    
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 47,015 38,288    
Home Equity Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 127,113 112,426    
Unsecured Debt [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 4,120 3,613    
Other Consumer Loans [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total $ 10,290 $ 5,921