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FHLB Advances and Other Borrowings - Weighted Average Cost and Amount of Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Federal Home Loan Banks [Abstract]
Weighted average interest rate at end of year	3.35%	3.52%	3.52%
Weighted daily average interest rate during the year	3.57%	3.56%	3.57%
Daily average of FHLB advances	$ 1,848,904	$ 1,955,205	$ 1,905,479
Maximum amount of FHLB advances at any month end	1,930,000	2,205,000	1,930,000
Interest expense during the year (excludes interest rate swap expense)	$ 64,331	$ 68,307	$ 68,075

X

- Definition

The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.13(3)(a))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.13(3)(a))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The maximum balance outstanding at any month end during the period as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.13(3)(a))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Federal Home Loan Bank, Advances, Activity for Year, Daily Average Balance of Agreements Outstanding

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Interest Expense, Federal Home Loan Bank Advances

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