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Loans - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial, Total $ 709,946   $ 674,314      
Real Estate, Total 277,407   254,625      
Consumer, Total 336,006   320,459      
Mortgage warehouse 195,924   129,156      
Total loans 1,519,283   1,378,554      
Allowance for loan losses (16,421) $ (16,634) (16,501) $ (15,660) $ (16,102) $ (15,992)
Loans, net 1,502,862   1,362,053      
Working Capital and Equipment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial, Total 323,709   300,940      
Real Estate Including Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial, Total 353,859   343,455      
Tax Exempt Loans Receivable [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial, Total 8,665   8,595      
Other Commercial Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial, Total 23,713   21,324      
1-4 Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Real Estate, Total 273,753   250,799      
Other Real Estate Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Real Estate, Total 3,654   3,826      
Recreation Consumer Loans Receivable [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total 5,676   5,673      
Real Estate Home Improvement Loans Receivable [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total 41,309   38,288      
Home Equity [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total 112,095   112,426      
Other Consumer Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total 6,714   5,921      
Auto [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total 166,501   154,538      
Unsecured Debt [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer, Total $ 3,711   $ 3,613