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Commitments and Contingencies (Summarized credit-related financial instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Commitments and Contingencies [Abstract]    
Commitments to extend credit $ 847,105 $ 853,148
Commercial letters of credit 451 2,178
Standby letters of credit and financial guarantees 21,612 47,251
Loans sold with recourse $ 140,526 $ 147,399