Debt And Equity Securities (Composition Of The Company's Non-Agency Mortgage-Backed Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of Securities	10
Amortized Cost	$ 37,553	$ 42,100
Estimated Fair Value	30,937
Non-Investment Grade/Not Rated [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost basis of securities, percentage	100.00%
Prime Single Family Residential 2007 [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of Securities	1
Amortized Cost	5,371
Estimated Fair Value	4,031
Prime Single Family Residential 2007 [Member] \| Non-Investment Grade/Not Rated [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost basis of securities, percentage	100.00%
Prime Single Family Residential 2006 [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of Securities	6
Amortized Cost	15,899
Estimated Fair Value	11,963
Prime Single Family Residential 2006 [Member] \| Non-Investment Grade/Not Rated [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost basis of securities, percentage	100.00%
Prime Single Family Residential 2005 [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of Securities	1
Amortized Cost	3,797
Estimated Fair Value	3,054
Prime Single Family Residential 2005 [Member] \| Non-Investment Grade/Not Rated [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost basis of securities, percentage	100.00%
Alt-A Single Family Residential 2007 [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of Securities	2
Amortized Cost	12,486
Estimated Fair Value	$ 11,889
Alt-A Single Family Residential 2007 [Member] \| Non-Investment Grade/Not Rated [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost basis of securities, percentage	100.00%

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date which have been categorized as available-for-sale.

+ References+ Details