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Commitments (Summarized credit-related financial instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Commitments and Contingencies [Abstract]    
Commitments To Extend Credit $ 566,030 $ 485,019
Commercial letters credit 1,464 494
Standby letters of credit and financial guarantees 15,721 21,107
Loans sold with recourse $ 5,490 $ 6,420