Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Unearned Compensation-ESOP [Member]	Retained Earnings [Member]	AOCI [Member]	Total
Balance at Sep. 30, 2012	$ 1,554	$ 1,292,122	$ (47,575)	$ 536,150	$ 24,207	$ 1,806,458
Net income				17,563		17,563
Other comprehensive income, net of tax					(3,805)	(3,805)
ESOP activity, net		893	743			1,636
Restricted stock activity, net		149				149
Stock-based compensation		909				909
Repurchase of common stock	(33)	(27,155)		(11,469)		(38,657)
Dividends on common stock to stockholders ($0.78 per share)				(114,302)		(114,302)
Balance at Dec. 31, 2012	$ 1,521	$ 1,266,918	$ (46,832)	$ 427,942	$ 20,402	$ 1,669,951