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Loans - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage warehouse $ 74,120 $ 94,508    
Total loans 3,013,332 2,835,180    
Allowance for loan losses (17,820) (16,394) $ (14,837) $ (14,534)
Loans, net 2,995,512 2,818,786    
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 1,721,590 1,669,934    
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 668,141 609,739    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 549,481 460,999    
Working Capital and Equipment [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 804,083 720,477    
Real Estate Including Agriculture [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 834,037 880,861    
Tax Exempt Loans Receivable [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 48,975 36,324    
Other Commercial Loans [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 34,495 32,272    
1-4 Family [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 659,754 602,196    
Other Real Estate Loans [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 8,387 7,543    
Auto [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 327,413 244,003    
Recreation Consumer Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 13,975 8,728    
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 39,587 37,052    
Home Equity Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 163,209 165,240    
Unsecured Debt [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 4,043 3,479    
Other Consumer Loans [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total $ 1,254 $ 2,497