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Servicing Assets (Sensitivity of current fair value of servicing assets) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Servicing Assets At Fair Value [Line Items]  
Servicing Asset $ 50,779
Constant Prepayment Rate - Decrease in fair value due to 10% adverse change (1,085)
Constant Prepayment Rate - Decrease in fair value due to 20% adverse change (2,131)
Discount Rate - Decrease in fair value due to 10% adverse change (2,079)
Discount Rate - Decrease in fair value due to 20% adverse change $ (4,012)