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Commitments (Summarized credit-related financial instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Commitments and Contingencies [Abstract]    
Commitments To Extend Credit $ 459,403 $ 492,885
Commercial letters credit 1,108 2,721
Standby letters of credit and financial guarantees 4,500 4,041
Loans sold with recourse $ 8,007 $ 20,126