Income Taxes (Differences Between Effective Rates And Statutory Federal Income Tax Rate Computed On Income Before Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accrued Income Taxes [Abstract]
Federal income tax expense computed at statutory Federal rate, Amount	$ 40,303	$ 36,949	$ 40,600
Federal income tax expense computed at statutory Federal rate, Percentage	35.00%	35.00%	35.00%
Increases (Decreases) In Taxes Resulting From:
State taxes, net of Federal tax effect, Amount	3,200	3,073	3,495
State taxes, net of Federal tax effect, Percentage	2.80%	2.90%	3.00%
Low income housing tax credits, Amount	(3,580)	(2,675)	(2,081)
Low income housing tax credits, Percentage	(3.10%)	(2.50%)	(1.80%)
ESOP related expenses, net, Amount	(1,550)	(347)	591
ESOP related expenses, net, Percentage	(1.40%)	(0.30%)	0.50%
BOLI income, Amount	(698)	(519)	(517)
BOLI income, Percentage	(0.60%)	(0.50%)	(0.40%)
Other, Amount	(217)	(252)	(602)
Other, Percentage	(0.20%)	(0.30%)	(0.50%)
Income tax expense	$ 37,458	$ 36,229	$ 41,486
Income tax expense, Percentage	32.50%	34.30%	35.80%