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Loans (Servicing Assets) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Loans sold and serviced but owned by outside investors $ 132,100 $ 137,800  
Servicing assets 1,800 2,086 $ 1,389
Unamortized discount amount 1,443 1,282  
SBA Servicing Assets      
Financing Receivable, Impaired [Line Items]      
Servicing assets $ 893 779  
Discount rate used to determine fair value of mortgage servicing assets 15.00%    
SBA Servicing Assets | Minimum      
Financing Receivable, Impaired [Line Items]      
Interest strip multiples range used to determine fair value 2.08%    
Constant prepayment speeds range used to determine fair value 15.00%    
SBA Servicing Assets | Maximum      
Financing Receivable, Impaired [Line Items]      
Interest strip multiples range used to determine fair value 3.80%    
Constant prepayment speeds range used to determine fair value 18.00%    
Mortgage Servicing Assets      
Financing Receivable, Impaired [Line Items]      
Servicing assets $ 907 $ 1,307  
Discount rate used to determine fair value of mortgage servicing assets 12.00%    
Period used to determine the fair value of mortgage servicing assets 7 years