Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 17,813	$ 17,563
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(1,196)	(1,128)
Provision for credit losses	515	233
Originations of loans receivable held-for-sale ("LHFS")	(906)	(1,364)
Proceeds from sales of LHFS	1,453	1,320
Amortization and accretion of premiums and discounts on securities	1,511	2,294
Depreciation and amortization of premises and equipment	1,539	1,257
Amortization of deferred amounts related to FHLB advances, net	2,080	2,171
Common stock committed to be released for allocation - ESOP	510	1,636
Stock-based compensation	548	909
Changes in:
Prepaid federal insurance premium		987
Accrued interest receivable	773	1,773
Other assets, net	78	(3,379)
Income taxes payable/receivable	8,335	8,848
Accounts payable and accrued expenses	(7,950)	(11,865)
Net cash provided by operating activities	25,103	21,255
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(24,768)	(204,142)
Purchase of HTM securities	(30,896)	(193,191)
Proceeds from calls, maturities and principal reductions of AFS securities	96,656	345,298
Proceeds from calls, maturities and principal reductions of HTM securities	79,068	176,794
Proceeds from the redemption of capital stock of FHLB	3,350	3,315
Purchases of capital stock of FHLB	(2,719)
Net increase in loans receivable	(66,776)	(33,926)
Purchases of premises and equipment	(2,510)	(2,118)
Proceeds from sales of OREO	1,180	3,430
Net cash provided by investing activities	52,585	95,460
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(72,279)	(114,302)
Deposits, net of withdrawals	9,462	31,520
Proceeds from borrowings	250,000	334,150
Repayments on borrowings	(250,000)	(334,150)
Change in advance payments by borrowers for taxes and insurance	(33,462)	(31,824)
Repurchase of common stock	(7,029)	(38,657)
Stock options exercised	399
Net cash used in financing activities	(102,909)	(153,263)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(25,221)	(36,548)
CASH AND CASH EQUIVALENTS:
Beginning of Period	113,886	141,705
End of Period	88,665	105,157
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	296	12
Interest payments	$ 26,738	$ 30,601