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Restricted Cash (Composition) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash And Cash Equivalents Items [Line Items]    
Deposit pledged as collateral $ 3,030 $ 3,030
Derivatives    
Restricted Cash And Cash Equivalents Items [Line Items]    
Deposit pledged as collateral 1,980 1,980
Obligations under agreements of loans sold with recourse    
Restricted Cash And Cash Equivalents Items [Line Items]    
Deposit pledged as collateral $ 1,050 $ 1,050