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Allowance for Losses on Loans - Narrative (Details) (USD $)	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	$ 8,669,717,000		$ 7,990,545,000
Allowance for loans acquired	0		0
Nonaccrual loans by portfolio segment	87,431,000		131,299,000
Allowance for credit losses, charge-offs, net of recoveries	14,365,000		17,756,000
Allowance for probable losses	112,347,000		116,741,000		133,147,000
Non-Performing Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	147,311,000		213,616,000
Ratio of non-performing assets to total assets	1.00%		1.63%
Acquired loans subject to general allowance	42,590,000
Nonaccrual loans by portfolio segment	87,431,000		131,299,000
Decrease in non-accrual loans	33.40%
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	8,316,874,000	[1]	7,495,504,000	[1]
Allowance for probable losses	112,287,000		113,268,000
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable, gross	134,736,000	[1]	159,564,000	[1]
Allowance for probable losses	$ 60,000		$ 3,473,000
[1] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans

X

- Definition

Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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X

- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524

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- Definition

Acquired Loans Subject to General Allowance

+ References

No definition available.

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- Definition

Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

+ References

No definition available.

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- Definition

Increase (Decrease) in Non-Accrual Loans

+ References

No definition available.

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- Definition

Ratio of Non-Performing Assets to Total Assets

+ References

No definition available.

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