Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation-ESOP [Member]	Unearned Compensation-RRP [Member]	Retained Earnings [Member]	AOCI (Loss) [Member]	Total
Balance at Sep. 30, 2011	$ 1,675	$ 1,392,691	$ (50,547)	$ (124)	$ 569,127	$ 26,707	$ 1,939,529
Comprehensive income:
Net income					18,789		18,789
Changes in unrealized gain/losses on securities AFS, net of deferred income taxes of $115						(256)	(256)
Total comprehensive income							18,533
ESOP activity, net		790	743				1,533
Stock based compensation - stock options and RRP		27		26			53
Dividends on common stock to stockholders ($0.175 per share)					(28,339)		(28,339)
Balance at Dec. 31, 2011	$ 1,675	$ 1,393,508	$ (49,804)	$ (98)	$ 559,577	$ 26,451	$ 1,931,309