Commercial Mortgage Residual Interests (Sensitivity Analysis Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Carrying amount of retained interests	$ 11,115	$ 11,626
Fair value at 25% discount rate
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Discount rate assumption	9,383
Fair value at 27% discount rate
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Discount rate assumption	8,777
Fair value of 1% increases above the CPR Index
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Prepayment speed assumption	11,114
Fair value of 2% increases above the CPR Index
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Prepayment speed assumption	11,113
Fair value 2% adverse change
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Expected credit losses	11,017
Fair value 3% adverse change
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Expected credit losses	10,969
Fair value of Prime/LIBOR spread contracting 25 basis points
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Yield Assumptions	11,331
Fair value of Prime/LIBOR spread contracting 50 basis points
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Yield Assumptions	$ 11,553
Minimum
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Discount rate assumption, percent	25.00%
Prepayment speed assumption, percent	1.00%
Expected credit losses, percent	2.00%
Yield Assumptions, basis point	0.25%
Maximum
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Discount rate assumption, percent	27.00%
Prepayment speed assumption, percent	2.00%
Expected credit losses, percent	3.00%
Yield Assumptions, basis point	0.50%