Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Derivative Assets	$ 39,803	$ 24,722
Derivative liabilities	(50,612)	(38,982)
Forward Commitments To Sell Mortgage Loans [Member] | Other Assets [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Assets	283	211
Other Assets [Member]
Derivative Assets	39,803	24,722
Other Assets [Member] | Derivatives Designated As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Assets	132
Other Assets [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Assets	39,671	24,722
Other Assets [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Interest rate swaps designated as Cash Flow Hedges, Assets	32,882	18,313
Other Assets [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Interest rate swaps designated as Cash Flow Hedges, Assets	6,506	6,198
Forward Commitments To Sell Mortgage Loans [Member] | Other Liabilities [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Liabilities	5,116	4,261
Other Liabilities [Member]
Derivative liabilities	50,612	38,982
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Liabilities	12,339	15,543
Other Liabilities [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]
Interest rate swaps designated as Cash Flow Hedges, Liabilities	38,273	23,439
Other Liabilities [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Interest rate swaps designated as Cash Flow Hedges, Liabilities	32,908	18,999
Other Liabilities [Member] | Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Interest rate swaps designated as Cash Flow Hedges, Liabilities	$ 249	$ 179