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Loan Servicing- Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Mortgage Loans    
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]    
Loans serviced for others $ 306,168 $ 259,207
SBA Loans    
Schedule Of Mortgage And Small Business Administration Loans Serviced [Line Items]    
Loans serviced for others $ 166,148 $ 110,263