Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details)		12 Months Ended
		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securitized debt		$ 0		$ 774,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[1]			$ 201,373,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]			1.83
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]			119.58
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]			73.58
Level 3 [Member] | Market Approach Valuation Technique [Member] | Asset-backed Securities backed by consumer loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[2]			$ 1,344,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Asset-backed Securities backed by consumer loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[2]			100.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Asset-backed Securities backed by consumer loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[2]			100.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Asset-backed Securities backed by consumer loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[2]			100.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 18,972,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		3.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		200.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		77.85
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 89,549,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		1.81
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		151.86
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		68.47
Level 3 [Member] | Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 41,978,000		$ 121,674,000	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		13.00		21.50	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		102.00		137.00	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		84.84		94.85	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 20,365,000		$ 40,919,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		6.07		5.62
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		73.20		103.25
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		41.28		66.56
Level 3 [Member] | Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 21,067,000		$ 22,928,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		2.97		3.62
Level 3 [Member] | Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		22.41		24.86
Level 3 [Member] | Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		11.08		11.38
Level 3 [Member] | Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 115,376,000		$ 22,950,000	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		9.00%		0.00%	[2]
Projected Collateral Prepayments		0.00%
Fair Value Inputs Losses		1.00%
Fair Value Inputs Projected Collateral Scheduled Amortization		57.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		15.00%		12.00%	[2]
Projected Collateral Prepayments		40.90%
Fair Value Inputs Losses		33.80%
Fair Value Inputs Projected Collateral Scheduled Amortization		80.80%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		10.40%		9.10%	[2]
Projected Collateral Prepayments		30.90%
Fair Value Inputs Losses		7.30%
Fair Value Inputs Projected Collateral Scheduled Amortization		61.80%
Total Outstanding Collateral		100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 45,668,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation				73.00
Yield				7.50%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation				108.00
Yield				24.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation				95.08
Yield				13.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 13,920,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		15.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		20.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		16.20%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 26,886,000		$ 72,222,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		3.40%		3.00%
Projected Collateral Prepayments		5.40%		6.70%
Fair Value Inputs Losses		2.90%		0.00%
Fair Value Inputs Projected Collateral Recoveries		0.30%		0.00%
Fair Value Inputs Projected Collateral Scheduled Amortization		8.60%		0.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		27.10%		13.60%
Projected Collateral Prepayments		74.60%		100.00%
Fair Value Inputs Losses		24.50%		44.50%
Fair Value Inputs Projected Collateral Recoveries		13.00%		22.40%
Fair Value Inputs Projected Collateral Scheduled Amortization		88.60%		86.40%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		19.90%		7.00%
Projected Collateral Prepayments		46.30%		45.60%
Fair Value Inputs Losses		11.40%		11.30%
Fair Value Inputs Projected Collateral Recoveries		8.00%		8.00%
Fair Value Inputs Projected Collateral Scheduled Amortization		34.30%		35.10%
Total Outstanding Collateral		100.00%		100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 3,996,000		$ 320,000	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		8.30%		14.40%	[2]
Projected Collateral Prepayments		31.90%		62.70%	[2]
Fair Value Inputs Losses		2.60%		4.00%	[2]
Fair Value Inputs Projected Collateral Recoveries		2.30%		1.70%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		33.30%		31.60%	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		20.60%		14.40%	[2]
Projected Collateral Prepayments		52.30%		62.70%	[2]
Fair Value Inputs Losses		17.30%		4.00%	[2]
Fair Value Inputs Projected Collateral Recoveries		15.50%		1.70%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		51.50%		31.60%	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		13.50%		14.40%	[2]
Projected Collateral Prepayments		41.10%		62.70%	[2]
Fair Value Inputs Losses		12.90%		4.00%	[2]
Fair Value Inputs Projected Collateral Recoveries		10.10%		1.70%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		35.90%		31.60%	[2]
Total Outstanding Collateral		100.00%		100.00%	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 13,780,000		$ 12,392,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		19.20%		12.00%
Fair Value Inputs Losses		0.70%		0.10%
Fair Value Inputs Projected Collateral Recoveries		1.50%		0.90%
Fair Value Inputs Projected Collateral Scheduled Amortization		83.40%		85.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		25.00%		51.10%
Fair Value Inputs Losses		2.30%		2.50%
Fair Value Inputs Projected Collateral Recoveries		14.30%		13.50%
Fair Value Inputs Projected Collateral Scheduled Amortization		97.60%		99.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		22.10%		23.70%
Fair Value Inputs Losses		1.60%		0.70%
Fair Value Inputs Projected Collateral Recoveries		8.40%		6.20%
Fair Value Inputs Projected Collateral Scheduled Amortization		90.00%		93.10%
Total Outstanding Collateral		100.00%		100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 43,847,000		$ 21,328,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		9.80%		9.20%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		17.60%		13.10%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		11.90%		10.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and commercial real estate owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 30,984,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and commercial real estate owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		10.20%
Months to Resolution		4 months
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and commercial real estate owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		19.40%
Months to Resolution		24 months
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and commercial real estate owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		13.70%
Months to Resolution		9 months 10 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 3,851,000		$ 8,457,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		18.00%		50.20%
Fair Value Inputs Projected Collateral Scheduled Amortization		0.00%		0.00%
LIBOR OAS		4.41%	[3]	(1.54%)	[4]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		100.00%		100.00%
Fair Value Inputs Projected Collateral Scheduled Amortization		82.00%		49.80%
LIBOR OAS		16.72%	[3]	17.96%	[4]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		70.40%		75.50%
Fair Value Inputs Projected Collateral Scheduled Amortization		29.60%		24.50%
Total Outstanding Collateral		100.00%		100.00%
LIBOR OAS		6.22%	[3]	3.59%	[4]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 13,848,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		5.50%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		8.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		6.50%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 12,331,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		5.70%
Months to Resolution		3 months 12 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		7.90%
Months to Resolution		113 months 18 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		7.30%
Months to Resolution		20 months 18 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 36,117,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				6.10%
Months to Resolution				4 months 3 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				12.00%
Months to Resolution				79 months 3 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				7.30%
Months to Resolution				24 months 18 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 6,981,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				15.30%
Months to Resolution				15 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				20.10%
Months to Resolution				10 months 15 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				16.40%
Months to Resolution				8 months 6 days
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 6,111,000		$ 11,148,000
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		26.60%		17.80%
Fair Value Inputs Losses		15.00%		16.50%
Fair Value Inputs Projected Collateral Recoveries		6.80%		7.70%
Fair Value Inputs Projected Collateral Scheduled Amortization		24.50%		15.90%
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		44.10%		55.80%
Fair Value Inputs Losses		33.70%		37.70%
Fair Value Inputs Projected Collateral Recoveries		16.90%		18.50%
Fair Value Inputs Projected Collateral Scheduled Amortization		33.10%		43.40%
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		32.60%		32.50%
Fair Value Inputs Losses		26.50%		29.70%
Fair Value Inputs Projected Collateral Recoveries		12.00%		12.80%
Fair Value Inputs Projected Collateral Scheduled Amortization		28.90%		25.00%
Total Outstanding Collateral		100.00%		100.00%
Total Return Swaps [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure		$ (4,577,000)
Total Return Swaps [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[5]	36.38
Total Return Swaps [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[5]	99.88
Total Return Swaps [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[5]	56.38
Guarantees [Member] | Level 3 [Member] | Recent Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure		$ (828,000)
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 6,241,000
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				10.00%
Expected Holding Period (Months)				17 months
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				10.00%
Expected Holding Period (Months)				17 months
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				10.00%
Expected Holding Period (Months)				17 months
Private Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 10,558,000
Private Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		14.00%
Expected Holding Period (Months)		14 months 9 days
Private Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		16.50%
Expected Holding Period (Months)		27 months
Private Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		14.70%
Expected Holding Period (Months)		23 months 15 days
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[6]	2.7
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[6]	2.7
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[6]	2.7
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Enterprise Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 2,738,000
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Recent Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 2,630,000		$ 5,411,000

[1] Includes securitized debt with a fair value of $0.8 million as of December 31, 2014.

[2] Conformed to current period presentation.

[3] Shown in basis points.

[4] Shown in basis points.

[5] Represents valuations on underlying assets.

[6] Represent an estimation of where market participants might value an enterprise.