Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 57,484	$ 53,273
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(3,877)	(3,384)
Provision for credit losses	982	(567)
Originations of loans receivable held-for-sale ("LHFS")	(1,325)	(4,996)
Proceeds from sales of LHFS	1,998	5,527
Amortization and accretion of premiums and discounts on securities	4,502	6,640
Depreciation and amortization of premises and equipment	4,704	3,980
Amortization of deferred amounts related to FHLB advances, net	4,882	6,158
Common stock committed to be released for allocation - ESOP	1,516	4,922
Stock-based compensation	1,617	2,123
Changes in:
Prepaid federal insurance premium		11,802
Accrued interest receivable	361	1,666
Other assets, net	2,014	(3,791)
Income taxes payable/receivable	3,766	3,901
Accounts payable and accrued expenses	(11,983)	(12,684)
Net cash provided by operating activities	66,641	74,570
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(120,817)	(408,497)
Purchase of HTM securities	(164,128)	(420,501)
Proceeds from calls, maturities and principal reductions of AFS securities	332,841	620,620
Proceeds from calls, maturities and principal reductions of HTM securities	240,907	482,352
Proceeds from the redemption of FHLB stock	22,387	4,524
Purchases of FHLB stock	(2,856)	(2,391)
Net increase in loans receivable	(177,483)	(189,051)
Purchases of premises and equipment	(5,036)	(10,802)
Proceeds from sales of other real estate owned ("OREO")	3,888	7,770
Net cash provided by investing activities	129,703	84,024
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(127,854)	(136,121)
Deposits, net of withdrawals	43,416	77,793
Proceeds from borrowings	644,477	875,535
Repayments on borrowings	(694,477)	(875,535)
Change in advance payments by borrowers for taxes and insurance	(21,956)	(21,310)
Repurchase of common stock	(65,823)	(89,374)
Stock options exercised	411
Net cash used in financing activities	(221,806)	(169,012)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(25,462)	(10,418)
CASH AND CASH EQUIVALENTS:
Beginning of Period	113,886	141,705
End of Period	88,424	131,287
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Income tax payments	23,790	23,718
Interest payments	$ 75,705	$ 87,171