Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 17,563	$ 18,789
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(1,128)	(1,091)
Provision for credit losses	233	540
Originations of loans receivable held-for-sale ("LHFS")	(1,364)	(1,641)
Proceeds from sales of LHFS	1,320	1,595
Amortization and accretion of premiums and discounts on securities	2,294	2,065
Depreciation and amortization of premises and equipment	1,257	1,199
Amortization of deferred amounts related to FHLB advances, net	2,171	1,842
Common stock committed to be released for allocation - ESOP	1,636	1,533
Stock-based compensation	909	53
Changes in:
Prepaid federal insurance premium	987	964
Accrued interest receivable	1,773	1,031
Other assets, net	(3,379)	70
Income taxes payable/receivable	8,848	6,998
Accounts payable and accrued expenses	(11,865)	(4,995)
Net cash provided by operating activities	21,255	28,952
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(204,142)	(273,634)
Purchase of HTM securities	(193,191)	(149,706)
Proceeds from calls, maturities and principal reductions of AFS securities	345,298	187,947
Proceeds from calls, maturities and principal reductions of HTM securities	176,794	389,366
Proceeds from the redemption of capital stock of FHLB	3,315	2,117
Purchases of capital stock of FHLB		(3,652)
Net increase in loans receivable	(33,926)	(77,848)
Purchases of premises and equipment	(2,118)	(1,546)
Proceeds from sales of OREO	3,430	2,330
Net cash provided by investing activities	95,460	75,374
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(114,302)	(28,339)
Deposits, net of withdrawals	31,520	5,971
Proceeds from borrowings	334,150	250,000
Repayments of borrowings	(334,150)	(250,000)
Change in advance payments by borrowers for taxes and insurance	(31,824)	(32,853)
Repurchase of common stock	(38,657)
Net cash used in financing activities	(153,263)	(55,221)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(36,548)	49,105
CASH AND CASH EQUIVALENTS:
Beginning of Period	141,705	121,070
End of Period	105,157	170,175
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	12	3,197
Interest payments	$ 30,601	$ 38,471