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Loan and Lease Receivables - Additional Information (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Oct. 14, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]          
Total loans and leases $ 2,275,691,000 $ 2,147,163,000      
Loans held for sale pledged as security for borrowings 516,900,000 507,200,000      
Allowance for loan and lease losses 16,706,000 10,923,000   $ 7,632,000 $ 4,794,000
Acquired Impaired Loans          
Accounts Notes And Loans Receivable [Line Items]          
Loans acquired 0 0 $ 39,654,000    
Allowance for loan and lease losses 3,900,000 1,600,000      
Acquired Non-Impaired Loans and Leases | Ridgestone          
Accounts Notes And Loans Receivable [Line Items]          
Loans acquired 312,200,000        
U.S. Government Guaranteed Loans          
Accounts Notes And Loans Receivable [Line Items]          
Total loans and leases 77,000,000 34,800,000      
Installment and Other          
Accounts Notes And Loans Receivable [Line Items]          
Total loans and leases 4,182,000 2,917,000      
Overdraft deposits reclassified as loans 617,000 1,000,000      
Allowance for loan and lease losses $ 41,000 $ 334,000   $ 357,000 $ 121,000