Mortgage-Backed Securities (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Mortgage-Backed Securities [Abstract]

Schedule Of Mortgage-Backed Securities Portfolio Backed By U.S. Government Agency Or U.S. Government Sponsored Entity

	Amortized Cost		Unrealized Loss			Unrealized Gain		Estimated Fair Value
Agency MBS
Fannie Mae Certificates
ARMS	$	11,446,397	$	—		$	278,559	$	11,724,956
Fixed Rate		493,648		(132	)		1,076		494,592
Total Fannie Mae		11,940,045		(132	)		279,635		12,219,548
Freddie Mac Certificates
ARMS		4,925,438	$	—			103,540		5,028,978
Fixed Rate		491,289		(6	)		2,064		493,347
Total Freddie Mae		5,416,727		(6	)		105,604		5,522,325
Total Agency MBS	$	17,356,772	$	(138	)	$	385,239	$	17,741,873

	MBS Amortized Cost		Gross Unrealized Loss			Gross Unrealized Gain		Estimated Fair Value
Agency MBS
Fannie Mae Certificates
ARMS	$	6,537,472	$	(18,342	)	$	138,626	$	6,657,756
Fixed Rate		0		0			0		0
Total Fannie Mae		6,537,472		(18,342	)		138,626		6,657,756
Freddie Mac Certificates
ARMS		2,887,432		(14,783	)		56,811		2,929,460
Fixed Rate		0		0			0		0
Total Freddie Mae		2,887,432		(14,783	)		56,811		2,929,460
Total Agency MBS	$	9,424,904	$	(33,125	)	$	195,437	$	9,587,216

Components Of Carrying Value Of Available-For-Sale Mortgage-Backed Securities

	December 31, 2011			December 31, 2010
Principal balance	$	16,938,710		$	9,228,093
Unamortized premium		418,071			196,823
Unamortized discount		(9	)		(12	)
Gross unrealized gains		385,239			195,437
Gross unrealized losses		(138	)		(33,125	)
Carrying value/estimated fair value	$	17,741,873		$	9,587,216

Schedule Of Mortgage-Backed Securities In A Loss Position

	Less than 12 months as of December 31, 2011					Less than 12 months as of December 31, 2010
	Fair Market Value		Unrealized Loss			Fair Market Value		Unrealized Loss
Fannie Mae Certificates
ARMS	$	—	$	—		$	1,641,355	$	(18,342	)
Fixed Rate		210,743		(132	)		0		0
Freddie Mac Certificates
ARMS		—		—			1,186,443		(14,783	)
Fixed Rate		23,012		(6	)		0		0
Total temporarily impaired securities	$	233,755	$	(138	)	$	2,827,798	$	(33,125	)

Schedule Of Interest Income

	Twelve Months Ended
	December 31, 2011			December 31, 2010			December 31, 2009
Coupon interest on MBS	$	518,048		$	305,529		$	301,707
Net premium amortization		(93,335	)		(41,778	)		(19,363	)
Interest income on MBS, net	$	424,713		$	263,751		$	282,344

Schedule Of Information About Mortgage-Backed Securities That Will Reprice Or Amortize Based On Contractual Terms

	December 31, 2011								December 31, 2010
	Fair Value		% of Total			Weighted Average Coupon			Fair Value		% of Total			Weighted Average Coupon
Months to Coupon Reset or Contractual Payment
0- 18 Months	$	1,443,135		8.1	%		4.75	%	$	632,979		6.6	%		3.80	%
19- 36 Months	$	1,010,209		5.7	%		3.95	%		1,628,967		17.0	%		5.15	%
37- 60 Months	$	8,108,775		45.7	%		3.33	%		5,195,155		54.2	%		3.78	%
61- 84 Months	$	6,036,655		34.0	%		3.32	%		1,938,935		20.2	%		3.46	%
85- 120 Months	$	155,160		0.9	%		3.96	%		191,180		2.0	%		3.56	%
121- 180 Months	$	987,939		5.6	%		3.05	%		—		—			—
Total MBS	$	17,741,873		100.0	%		3.46	%	$	9,587,216		100.0	%		3.94	%

Schedule Of Agency Securities Impact On Accumulated Other Comprehensive Income

	31-Dec-11			31-Dec-10
Beginning balance	($	26,217	)	$	156,090
Unrealized gains (losses) on agency securities		229,124			(195,858	)
Reclassification of net income included in income statement		20,576			13,551
Ending balance		223,483			(26,217	)

Schedule Of Agency MBS Forward Purchase Commitments

Face		Cost		Fair Market Value		Due to Brokers (1)		Net Asset
$	340,000	$	348,937	$	351,249	$	348,937	$	2,312

(1) Amounts due to brokers are usually settled within 30-90 days after period end.