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Commitments (Summarized credit-related financial instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Commitments and Contingencies [Abstract]    
Commitments To Extend Credit $ 457,104 $ 492,885
Commercial letters credit 1,403 2,721
Standby letters of credit and financial guarantees 18,215 4,041
Loans sold with recourse $ 6,568 $ 20,126