Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securitized debt	$ 983,000		$ 1,335,000
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	756,934,000		599,914,000
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	[1]
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	[1]
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	[1]
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	[1]
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] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	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	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	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	14.53
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value			527,031,000	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield			2.60%	[2]
Projected Collateral Prepayments			0.70%	[2]
Projected Collateral Losses			3.70%	[2]
Projected Collateral Recoveries			0.00%	[2]
Projected Collateral Scheduled Amortization			4.10%	[2]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield			29.10%	[2]
Projected Collateral Prepayments			64.60%	[2]
Projected Collateral Losses			79.70%	[2]
Projected Collateral Recoveries			41.00%	[2]
Projected Collateral Scheduled Amortization			90.40%	[2]
Level 3 [Member] | Income 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]
Yield			7.80%	[2]
Projected Collateral Prepayments			22.70%	[2]
Projected Collateral Losses			28.00%	[2]
Projected Collateral Recoveries			21.40%	[2]
Projected Collateral Scheduled Amortization			27.90%	[2]
Total Outstanding Collateral			100.00%	[2]
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	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	3.80%
Projected Collateral Prepayments	6.90%
Projected Collateral Losses	4.30%
Projected Collateral Recoveries	0.30%
Projected Collateral Scheduled Amortization	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	20.50%
Projected Collateral Prepayments	64.50%
Projected Collateral Losses	35.20%
Projected Collateral Recoveries	17.10%
Projected Collateral Scheduled Amortization	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%
Projected Collateral Prepayments	29.70%
Projected Collateral Losses	17.40%
Projected Collateral Recoveries	9.10%
Projected Collateral Scheduled Amortization	43.80%
Total Outstanding Collateral	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	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	9.20%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	15.40%
Projected Collateral Scheduled Amortization	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	18.20%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	15.40%
Projected Collateral Scheduled Amortization	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	13.50%
Projected Collateral Losses	0.20%
Projected Collateral Recoveries	15.40%
Projected Collateral Scheduled Amortization	84.40%
Total Outstanding Collateral	100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	16,296,000		36,030,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	19.30%		8.70%
Projected Collateral Losses	15.50%		20.40%
Projected Collateral Recoveries	8.20%		12.20%
Projected Collateral Scheduled Amortization	15.70%		9.80%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	59.00%		44.10%
Projected Collateral Losses	47.80%		57.10%
Projected Collateral Recoveries	15.20%		32.80%
Projected Collateral Scheduled Amortization	41.20%		35.50%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	29.90%		18.70%
Projected Collateral Losses	34.80%		37.80%
Projected Collateral Recoveries	13.10%		19.30%
Projected Collateral Scheduled Amortization	22.20%		24.20%
Total Outstanding Collateral	100.00%		100.00%
Level 3 [Member] | Income 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			28,873,000
Level 3 [Member] | Income 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]
Yield			5.20%
Projected Collateral Losses			0.00%
Projected Collateral Recoveries			0.00%
Projected Collateral Scheduled Amortization			0.00%
Level 3 [Member] | Income 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]
Yield			17.90%
Projected Collateral Losses			25.10%
Projected Collateral Recoveries			88.90%
Projected Collateral Scheduled Amortization			100.00%
Level 3 [Member] | Income 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]
Yield			9.50%
Projected Collateral Losses			3.90%
Projected Collateral Recoveries			20.50%
Projected Collateral Scheduled Amortization			75.60%
Total Outstanding Collateral			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	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%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	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	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	10,123,000
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	15.00%
Months to Resolution	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%
Months to Resolution	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	15.00%
Months to Resolution	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	1,721,000		6,644,000
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	49.00%		81.00%
Projected Collateral Scheduled Amortization	41.90%		0.00%	[3]
LIBOR OAS	3.49%	[4]	8.16%	[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	58.10%		100.00%
Projected Collateral Scheduled Amortization	51.00%		19.00%	[3]
LIBOR OAS	6.45%	[4]	75.58%	[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	51.20%		92.70%
Projected Collateral Scheduled Amortization	48.80%		7.30%	[3]
LIBOR OAS	4.22%	[4]	11.89%	[4]
Total Outstanding Collateral	100.00%		100.00%
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 117 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 117 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 117 days

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

[2] Includes securitized debt with a fair value of $1.3 million as of December 31, 2012.

[3] For simplicity of presentation, net negative amortization is disregarded.

[4] Shown in basis points.