Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securitized debt	$ 870,000		$ 983,000
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	771,048,000		756,934,000
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	422,033,000	[1]
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 Indicative Price	1.96	[1]
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 Indicative Price	109.91	[1]
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 Indicative Price	76.65	[1]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities, Other Asset-backed securities And Securitized Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value			550,701,000	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities, Other Asset-backed securities And Securitized Debt [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			1.80	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities, Other Asset-backed securities And Securitized Debt [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			110.35	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities, Other Asset-backed securities And Securitized Debt [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			78.09	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage Backed Securities And Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value			34,489,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage Backed Securities And Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			14.25
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage Backed Securities And Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			102.89
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage Backed Securities And Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price			74.24
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	33,367,000
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 Indicative Price	10.02
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 Indicative Price	97.09
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 Indicative Price	57.28
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	35,069,000		38,783,000
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 Indicative Price	3.76		6.26
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 Indicative Price	30.14		33.77
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 Indicative Price	13.65		14.53
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	102,804,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	48.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	162.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	102.08
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	79,167,000		67,158,000
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	3.60%		3.80%
Projected Collateral Prepayments	7.60%		6.90%
Projected Collateral Losses	3.00%		4.30%
Projected Collateral Recoveries	0.00%		0.30%
Projected Collateral Scheduled Amortization	0.00%		14.10%
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	16.10%		20.50%
Projected Collateral Prepayments	83.60%		64.50%
Projected Collateral Losses	45.20%		35.20%
Projected Collateral Recoveries	25.50%		17.10%
Projected Collateral Scheduled Amortization	79.50%		87.30%
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	7.30%		8.00%
Projected Collateral Prepayments	40.10%		29.70%
Projected Collateral Losses	13.10%		17.40%
Projected Collateral Recoveries	8.30%		9.10%
Projected Collateral Scheduled Amortization	38.50%		43.80%
Total Outstanding Collateral	100.00%		100.00%
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	12,950,000		3,480,000
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	14.50%		9.20%
Projected Collateral Losses	0.20%		0.20%
Projected Collateral Recoveries	2.80%		15.40%
Projected Collateral Scheduled Amortization	84.90%		84.40%
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	28.40%		18.20%
Projected Collateral Losses	1.10%		0.20%
Projected Collateral Recoveries	14.10%		15.40%
Projected Collateral Scheduled Amortization	97.00%		84.40%
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	22.70%		13.50%
Projected Collateral Losses	0.80%		0.20%
Projected Collateral Recoveries	8.40%		15.40%
Projected Collateral Scheduled Amortization	90.80%		84.40%
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	19,108,000		8,788,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.00%		12.70%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	19.70%		12.80%
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	17.50%		12.70%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	10,744,000		10,123,000
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	10.30%		15.00%
Months to Resolution	3 months		5 months
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	15.00%		15.00%
Months to Resolution	28 months		7 months
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	13.90%		15.00%
Months to Resolution	7 months 26 days		6 months
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	3,503,000		1,721,000
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	57.20%		49.00%
Projected Collateral Scheduled Amortization	0.00%		41.90%
LIBOR OAS	(0.44%)	[3]	3.49%	[3]
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%		58.10%
Projected Collateral Scheduled Amortization	42.80%		51.00%
LIBOR OAS	14.01%	[3]	6.45%	[3]
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	77.00%		51.20%
Projected Collateral Scheduled Amortization	23.00%		48.80%
Total Outstanding Collateral	100.00%		100.00%
LIBOR OAS	6.71%	[3]	4.22%	[3]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	24,611,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.50%
Months to Resolution	4 months
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	12.00%
Months to Resolution	26 months
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	7.40%
Months to Resolution	12 months 21 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value			24,062,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield			7.40%
Months to Resolution			16 months 9 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield			7.40%
Months to Resolution			16 months 9 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield			7.40%
Months to Resolution			16 months 9 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	6,348,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	5.90%
Projected Collateral Prepayments	0.00%
Projected Collateral Losses	1.10%
Projected Collateral Recoveries	0.00%
Projected Collateral Scheduled Amortization	0.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	13.90%
Projected Collateral Prepayments	73.80%
Projected Collateral Losses	94.60%
Projected Collateral Recoveries	92.80%
Projected Collateral Scheduled Amortization	28.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other sset-backed securities and loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	9.20%
Projected Collateral Prepayments	9.50%
Projected Collateral Losses	75.60%
Projected Collateral Recoveries	7.30%
Projected Collateral Scheduled Amortization	7.60%
Total Outstanding Collateral	100.00%
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	12,410,000		16,296,000
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	18.70%		19.30%
Projected Collateral Losses	15.80%		15.50%
Projected Collateral Recoveries	7.60%		8.20%
Projected Collateral Scheduled Amortization	15.90%		15.70%
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	56.90%		59.00%
Projected Collateral Losses	46.40%		47.80%
Projected Collateral Recoveries	16.90%		15.20%
Projected Collateral Scheduled Amortization	42.10%		41.20%
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	32.20%		29.90%
Projected Collateral Losses	31.00%		34.80%
Projected Collateral Recoveries	12.50%		13.10%
Projected Collateral Scheduled Amortization	24.30%		22.20%
Total Outstanding Collateral	100.00%		100.00%
Private Corporate Investments [Member] | Preferred Stock [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	5,000,000
Private Corporate Investments [Member] | Preferred Stock [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.70%
Expected Holding Period (Months)	47 months 27 days
Private Corporate Investments [Member] | Preferred Stock [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.70%
Expected Holding Period (Months)	47 months 27 days
Private Corporate Investments [Member] | Preferred Stock [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.70%
Expected Holding Period (Months)	47 months 27 days
Private Corporate Investments [Member] | Equity in Mortgage Originator [Member] | Level 3 [Member] | Recent Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,686,000

[1] Includes securitized debt with a fair value of $0.9 million as of September 30, 2014.

[2] Includes securitized debt with a fair value of $1.0 million as of December 31, 2013.

[3] Shown in basis points.