Note 5 - Agency Securities, Available for Sale (Tables)

3 Months Ended

Mar. 31, 2013

Angency Securities [Member]

Available-for-sale Securities [Table Text Block]

March 31, 2013	Fannie  Mae			Freddie Mac			Total Agency Securities
	(in thousands)
Principal Amount	$	641,220		$	397,048		$	1,038,268
Net unamortized premium		38,020			22,435			60,455
Amortized cost		679,240			419,483			1,098,723
Unrealized gains		-			-			-
Unrealized losses		(11,515	)		(8,927	)		(20,442	)
Fair value	$	667,725		$	410,556		$	1,078,281

December 31, 2012	Fannie  Mae			Freddie Mac			Total Agency Securities
	(in thousands)
Principal Amount	$	651,867		$	403,589		$	1,055,456
Net unamortized premium		38,683			22,821			61,504
Amortized cost		690,550			426,410			1,116,960
Unrealized gains		86			4			90
Unrealized losses		(2,480	)		(2,212	)		(4,692	)
Fair value	$	688,156		$	424,202		$	1,112,358

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2013				December 31, 2012
	(in thousands)
Weighted Average Life of all Agency Securities	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	-	$	-	$	-	$	-
Greater than one year and less than three years		-		-		-		-
Greater than three years and less than five years		95,921		96,844		638,744		641,231
Greater than or equal to five years		982,360		1,001,879		473,614		475,729
Total Agency Securities	$	1,078,281	$	1,098,723	$	1,112,358	$	1,116,960

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	Unrealized Loss Position For: (in thousands)
	Less than 12 months					12 Months or More				Total
As of	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
March 31, 2013	$	1,078,281	$	(20,442	)	$	-	$	-	$	1,078,281	$	(20,442	)
December 31, 2012		1,032,421		(4,692	)		-		-		1,032,421		(4,692	)

Non-Agency Securities [Member]

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2013				December 31, 2012
	(in thousands)
Weighted Average Life of all Non-Agency Securities	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	-	$	-	$	-	$	-
Greater than one year and less than three years		-		-		-		-
Greater than three years and less than five years		5,584		5,409		5,763		5,678
Greater than or equal to five years		131,168		126,224		124,183		121,359
Total Non-Agency Securities	$	136,752	$	131,633	$	129,946	$	127,037

Trading Securities (and Certain Trading Assets) [Table Text Block]

	Non-Agency Securities (in thousands)
March 31, 2013	Fair Value		Amortized  Cost		Principal Amount		Weighted Average Coupon
Prime/Alt-A	$	136,752	$	131,633	$	160,955		5.35	%

	Non-Agency Securities (in thousands)
December 31, 2012	Fair Value		Amortized  Cost		Principal Amount		Weighted Average Coupon
Prime/Alt-A	$	129,946	$	127,037	$	156,957		5.29	%