Loans and Allowance for Loan Losses (Details 8) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Allowance for loan losses by portfolio segment
Balance at beginning of year	$ 262,306	$ 192,983	$ 236,574	$ 140,074
Provision for Loan Losses	25,000	50,000	95,000	150,000
Charge-offs			(73,347)
Recoveries			10,527
Net charge-offs	(18,552)	(26,700)	(62,820)	(73,791)
Balance at end of period	268,754	216,283	268,754	216,283
Loan portfolio:
Individually evaluated for impairment	61,759		61,759
Collectively evaluated for impairment	29,985,663		29,985,663
First Mortgage Loans [Member]
Allowance for loan losses by portfolio segment
Balance at beginning of year			227,224
Provision for Loan Losses			94,547
Charge-offs			(73,101)
Recoveries			10,512
Net charge-offs			(62,589)
Balance at end of period	259,182		259,182
Loan portfolio:
Individually evaluated for impairment	46,287		46,287
Collectively evaluated for impairment	29,658,064		29,658,064
Multi Family and Commercial [Member]
Allowance for loan losses by portfolio segment
Balance at beginning of year			4,419
Provision for Loan Losses			(294)
Charge-offs			0
Recoveries			0
Net charge-offs			0
Balance at end of period	4,125		4,125
Loan portfolio:
Individually evaluated for impairment	8,570		8,570
Collectively evaluated for impairment	31,388		31,388
Construction loans [Member]
Allowance for loan losses by portfolio segment
Balance at beginning of year			1,728
Provision for Loan Losses			(104)
Charge-offs			0
Recoveries			0
Net charge-offs			0
Balance at end of period	1,624		1,624
Loan portfolio:
Individually evaluated for impairment	6,902		6,902
Collectively evaluated for impairment	1,097		1,097
Consumer and Other Loans [Member]
Allowance for loan losses by portfolio segment
Balance at beginning of year			3,203
Provision for Loan Losses			851
Charge-offs			(246)
Recoveries			15
Net charge-offs			(231)
Balance at end of period	3,823		3,823
Loan portfolio:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	$ 295,114		$ 295,114