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Loans and Allowance for Loan and Lease Losses - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts Notes And Loans Receivable [Line Items]                
Premiums and discounts on acquired loans $ 11,688   $ 11,688     $ 15,210    
Net deferred origination and factoring fees 3,164   3,164     2,772    
Pledged loans 486,269   486,269     497,573    
Loans transferred to loans held for sale 0 $ 1,238 1,965 $ 4,119        
Proceeds from loans transferred to loans held for sale   1,233 1,919 4,038        
Losses on transfer of loans to loans held for sale     (46) (81)        
Recorded investments in troubled debt restructurings 12,086   12,086     18,386    
Allowance for loan and lease losses 19,797 13,772 $ 19,797 $ 13,772 $ 19,093 15,405 $ 12,093 $ 12,567
Number of defaults on modified loans | loan     3 0        
Recorded investments in troubled debt restructurings     $ 2,983          
Recorded investment charged off amount 1,083 779 5,398 $ 846        
Troubled Debt Restructuring                
Accounts Notes And Loans Receivable [Line Items]                
Allowance for loan and lease losses 435   435     1,911    
Recorded investment charged off amount     2,702          
Other non interest income                
Accounts Notes And Loans Receivable [Line Items]                
Losses on transfer of loans to loans held for sale   (5) (46) (81)        
Factored receivables                
Accounts Notes And Loans Receivable [Line Items]                
Customer reserves 27,751   27,751     23,597    
Allowance for loan and lease losses 4,507 4,204 4,507 4,204 $ 4,064 $ 4,088 $ 4,110 $ 4,509
Recorded investment charged off amount $ 386 $ 450 $ 966 $ 458