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Investments - Below investment grade securities (Details) (USD $)						3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Private label residential mortgage backed securities	Dec. 31, 2012 Private label residential mortgage backed securities	Mar. 31, 2013 Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 PHHAM Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 CWALT ONE Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 CWALT TWO Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 FHAMS Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 BAALT Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 ABFS Below investment grade Private label residential mortgage backed securities	Mar. 31, 2013 CONHE Below investment grade Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost			$ 5,707,000	$ 6,258,000	$ 4,370,000	$ 1,702,000	$ 595,000	$ 257,000	$ 1,562,000	$ 42,000	$ 173,000	$ 39,000
Available-for-sale Securities	367,962,000	393,965,000			4,785,000	1,859,000	610,000	237,000	1,849,000	32,000	135,000	63,000
Unrealized Gain (Loss)	$ 10,007,000	$ 12,891,000	$ 550,000		$ 415,000	$ 157,000	$ 15,000	$ (20,000)	$ 287,000	$ (10,000)	$ (38,000)	$ 24,000
12 Month Historical Prepayment Rates %						12.41%	15.52%	16.59%	12.75%	12.87%	8.28%	13.00%
Projected Default Rates %						21.30%	29.50%	32.80%	19.10%	12.30%	8.85%	6.12%
Projected Severity Rates %						51.00%	57.40%	70.50%	49.20%	50.70%	65.00%	67.33%
Original Purchase Price %						97.25%	100.73%	101.38%	95.00%	97.24%	97.46%	86.39%
Current Credit Enhancement %						0.00%	0.00%	(1.00%)	(0.80%)	2.07%	0.00%	0.00%

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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