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Commitments (Summarized credit-related financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Commitments and Contingencies [Abstract]    
Commitments To Extend Credit $ 539,661 $ 485,019
Commercial letters credit 1,735 494
Standby letters of credit and financial guarantees 21,343 21,107
Loans sold with recourse $ 5,917 $ 6,420