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Investments - Below investment grade securities (Details) (USD $)						6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Private label residential mortgage backed securities	Dec. 31, 2012 Private label residential mortgage backed securities	Jun. 30, 2013 Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 PHHAM Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 CWALT ONE Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 CWALT TWO Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 FHAMS Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 BAALT Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 ABFS Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 CWALT THREE Below investment grade Private label residential mortgage backed securities	Jun. 30, 2013 CONHE Below investment grade Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost			$ 5,232,000	$ 6,258,000	$ 4,068,000	$ 1,585,000	$ 552,000	$ 236,000	$ 1,430,000	$ 23,000	$ 147,000	$ 57,000	$ 38,000
Available-for-sale Securities	374,840,000	393,965,000			4,806,000	1,781,000	608,000	232,000	1,753,000	28,000	284,000	61,000	59,000
Unrealized Gain (Loss)	$ (2,234,000)	$ 12,891,000	$ 855,000		$ 738,000	$ 196,000	$ 56,000	$ (4,000)	$ 323,000	$ 5,000	$ 137,000	$ 4,000	$ 21,000
12 Month Historical Prepayment Rates %						16.85%	14.99%	17.71%	14.70%	13.39%	8.99%	21.17%	4.10%
Projected Default Rates %						20.23%	24.05%	23.11%	18.83%	11.65%	40.55%	11.15%	6.92%
Projected Severity Rates %						51.00%	47.15%	55.38%	53.90%	57.09%	46.75%	28.12%	46.75%
Original Purchase Price %						97.25%	100.73%	101.38%	95.00%	97.24%	97.46%	94.47%	86.39%
Current Credit Enhancement %						0.00%	0.00%	(1.24%)	(0.96%)	1.41%	0.00%	10.54%	0.00%

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