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Restricted Cash (Composition) (Details) - USD ($)
$ in Thousands
Sep. 30, 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