DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2012

Financial Instruments Other Than Debt Securities

	December 31, 2012				December 31, 2011
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Financial assets:
Residential mortgage loans	$	8,063	$	8,200	$	9,148	$	9,300
Interest rate swap agreements		169		169		617		617
Financial liabilities:
Repurchase arrangements with initial terms of greater than 120 days		41,520		41,500		47,419		47,400
Unsecured borrowings		103,095		104,600		103,095		104,200
Interest rate swap agreements		32,868		32,868		31,348		31,348

Fair Value And Related Disclosures For Debt Securities

	Amortized		Gross Unrealized
	Cost Basis		Gains		Losses		Fair Value
As of December 31, 2012
Agency Securities classified as available-for-sale	$	13,519,657	$	328,412	$	1,963	$	13,846,106
Residential mortgage securities classified as held-to-maturity		5,989		309		—		6,298
As of December 31, 2011
Agency Securities classified as available-for-sale		12,013,804		236,000		1,301		12,248,503
Residential mortgage securities classified as held-to-maturity		7,255		349		—		7,604

Securities In Unrealized Loss Position

	December 31, 2012				December 31, 2011
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Securities in an unrealized loss position:
One year or greater	$	29,760	$	120	$	4,933	$	26
Less than one year		751,645		1,843		369,226		1,275
	$	781,405	$	1,963	$	374,159	$	1,301