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Loans - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage warehouse $ 3,634,596 $ 3,011,570    
Total loans 3,636,841 3,013,332    
Allowance for loan losses (17,667) (17,820) $ (16,394) $ (14,837)
Loans, net 3,619,174 2,995,512    
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 2,046,651 1,721,590    
Mortgage warehouse 2,047,646 1,722,552    
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 770,717 668,141    
Mortgage warehouse 920,998 742,244    
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 669,180 549,481    
Mortgage warehouse 665,952 546,774    
Working Capital and Equipment [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 938,317 804,083    
Real Estate Including Agriculture [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 978,891 834,037    
Tax Exempt Loans Receivable [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 63,571 48,975    
Other Commercial Loans [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 65,872 34,495    
1-4 Family [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 762,571 659,754    
Other Real Estate Loans [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 8,146 8,387    
Auto [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 362,729 327,413    
Recreation Consumer Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 16,262 13,975    
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 43,585 39,587    
Home Equity Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 237,979 163,209    
Mortgage warehouse 276,215 197,494    
Unsecured Debt [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 7,286 4,043    
Other Consumer Loans [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial/Consumer, Total 1,339 1,254    
Mortgage Warehouse Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage warehouse $ 150,293 $ 74,120