Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 18,789	$ (11,258)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
FHLB stock dividends	(1,091)	(902)
Provision for credit losses	540	650
Originations of loans receivable held-for-sale ("LHFS")	(1,641)	(5,424)
Proceeds from sales of LHFS	1,595	6,895
Amortization and accretion of premiums and discounts on securities	2,065	1,431
Depreciation and amortization of premises and equipment	1,199	1,108
Amortization of deferred amounts related to FHLB advances, net	1,842	1,755
Common stock committed to be released for allocation - ESOP	1,533	1,260
Stock based compensation - stock options and RRP	53	74
Changes in:
Prepaid federal insurance premium	964	1,738
Accrued interest receivable	1,031	1,284
Other assets, net	70	394
Income taxes payable/receivable	6,998	(6,410)
Accounts payable and accrued expenses	(4,995)	662
Net cash flows provided by (used in) operating activities	28,952	(6,743)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(273,634)
Purchase of HTM securities	(149,706)	(486,425)
Proceeds from calls, maturities and principal reductions of AFS securities	187,947	130,673
Proceeds from calls, maturities and principal reductions of HTM securities	389,366	245,632
Proceeds from the redemption of capital stock of FHLB	2,117
Purchases of capital stock of FHLB	(3,652)
Loan originations and purchases, net of principal collected and deferred loan fees	(77,848)	42,438
Purchases of premises and equipment	(1,546)	(1,633)
Proceeds from sales of REO	2,330	2,665
Net cash flows (used in)/provided by investing activities	75,374	(66,650)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(28,339)	(16,956)
Deposits, net of withdrawals	5,971	313,481
Proceeds from borrowings	250,000	300,000
Repayments of borrowings	(250,000)	(300,000)
Change in advance payments by borrowers for taxes and insurance	(32,853)	(34,074)
Net proceeds from common stock offering	0	1,075,585
Excess tax benefits from stock options	0	1
Net cash flows (used in) provided by financing activities	(55,221)	1,338,037
NET INCREASE IN CASH AND CASH EQUIVALENTS	49,105	1,264,644
CASH AND CASH EQUIVALENTS:
Beginning of Period	121,070	65,217
End of Period	170,175	1,329,861
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	3,197	0
Interest payments	38,471	46,412
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Note received from ESOP in exchange for common stock	0	47,260
Customer deposit holds related to common stock offering	$ 0	$ 17,690