Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securitized debt	$ 925,000		$ 983,000
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	708,093,000		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	423,562,000	[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	1.88	[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	128.12	[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	77.52	[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 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	18,337,000		34,489,000
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	14.25		14.25
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	89.00		102.89
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	59.26		74.24
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	32,922,000		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	5.88		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	22.12		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	13.61		14.53
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	78,864,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	46.69
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	151.00
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Indicative Price	96.10
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	61,415,000		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	4.10%		3.80%
Projected Collateral Prepayments	7.10%		6.90%
Projected Collateral Losses	5.00%		4.30%
Projected Collateral Recoveries	0.30%		0.30%
Projected Collateral Scheduled Amortization	14.20%		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	16.60%		20.50%
Projected Collateral Prepayments	65.90%		64.50%
Projected Collateral Losses	45.40%		35.20%
Projected Collateral Recoveries	22.00%		17.10%
Projected Collateral Scheduled Amortization	85.40%		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	8.00%		8.00%
Projected Collateral Prepayments	31.90%		29.70%
Projected Collateral Losses	14.00%		17.40%
Projected Collateral Recoveries	8.80%		9.10%
Projected Collateral Scheduled Amortization	45.30%		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	9,710,000		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	12.50%		9.20%
Projected Collateral Losses	0.50%		0.20%
Projected Collateral Recoveries	5.40%		15.40%
Projected Collateral Scheduled Amortization	84.10%		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	36.60%		18.20%
Projected Collateral Losses	3.00%		0.20%
Projected Collateral Recoveries	14.60%		15.40%
Projected Collateral Scheduled Amortization	94.10%		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	20.00%		13.50%
Projected Collateral Losses	1.30%		0.20%
Projected Collateral Recoveries	8.60%		15.40%
Projected Collateral Scheduled Amortization	90.10%		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	20,332,000		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	12.70%		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	18.10%		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	14.60%		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	17,083,000		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	7 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	19.70%		15.00%
Months to Resolution	14 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	15.50%		15.00%
Months to Resolution	10 months		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	3,318,000		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	59.60%		49.00%
Projected Collateral Scheduled Amortization	22.60%		41.90%
LIBOR OAS	4.41%	[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	77.40%		58.10%
Projected Collateral Scheduled Amortization	40.40%		51.00%
LIBOR OAS	8.87%	[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	69.70%		51.20%
Projected Collateral Scheduled Amortization	30.30%		48.80%
LIBOR OAS	5.55%	[3]	4.22%	[3]
Total Outstanding Collateral	100.00%		100.00%
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	25,012,000
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	6.70%
Months to Resolution	7 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	7.20%
Months to Resolution	29 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	6.90%
Months to Resolution	14 months 9 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 Asset-backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	2,451,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	69.40%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	1.00%
Projected Collateral Scheduled Amortization	29.40%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	69.40%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	1.00%
Projected Collateral Scheduled Amortization	29.40%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	69.40%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	1.00%
Projected Collateral Scheduled Amortization	29.40%
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	$ 13,812,000		$ 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	19.10%		19.30%
Projected Collateral Losses	16.10%		15.50%
Projected Collateral Recoveries	7.40%		8.20%
Projected Collateral Scheduled Amortization	16.10%		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	56.30%		59.00%
Projected Collateral Losses	48.10%		47.80%
Projected Collateral Recoveries	16.00%		15.20%
Projected Collateral Scheduled Amortization	42.20%		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	31.10%		29.90%
Projected Collateral Losses	32.70%		34.80%
Projected Collateral Recoveries	12.40%		13.10%
Projected Collateral Scheduled Amortization	23.80%		22.20%
Total Outstanding Collateral	100.00%		100.00%

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

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

[3] Shown in basis points.