Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 205,205	$ 0
Less than 12 months, Unrealized Losses	(896)	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total Fair Value	205,205	0
Total Unrealized Losses	(896)	0
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	205,205
Less than 12 months, Unrealized Losses	(896)
12 months or longer, Fair Value	0
12 months or longer, Unrealized Losses	0
Total Fair Value	205,205
Total Unrealized Losses	(896)
Equity Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value		0
Less than 12 months, Unrealized Losses		0
12 months or longer, Fair Value		0
12 months or longer, Unrealized Losses		0
Total Fair Value		0
Total Unrealized Losses		$ 0