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Servicing Assets (Sensitivity of current fair value of servicing assets) (Details) - Traditional loan
$ in Thousands
Dec. 31, 2016
USD ($)
Servicing Assets At Fair Value Line Items  
Servicing Asset $ 9,858
Constant Prepayment Rate - Decrease in fair value due to 10% adverse change (220)
Constant Prepayment Rate - Decrease in fair value due to 20% adverse change (430)
Discount Rate - Decrease in fair value due to 10% adverse change (51)
Discount Rate - Decrease in fair value due to 20% adverse change $ (103)