Derivatives and Hedging Activities (Schedule of Fair Value Derivative Instruments) (Details) (Derivatives Not Designated as Hedging Instruments [Member], Interest Rate Contracts [Member], USD $) In Thousands | Sep. 30, 2011 | Sep. 30, 2010 |
|---|---|---|
Other Assets [Member] | ||
| Fair value of asset derivative instruments | $ 16,463 | $ 13,623 |
Other Liabilities [Member] | ||
| Fair value of liability derivative instruments | $ 16,463 | $ 13,623 |
| X | ||||||||||
- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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