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Loans Receivable - Loans Impaired, Loan Commitments and Loans Serviced (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Receivables [Abstract]
Recorded investment in impaired loans	$ 199,545	$ 251,274
TDRs included in impaired loans	156,858	207,377
Specific reserves on impaired loans	517	126
Average balance of impaired loans for year ended	228,398	274,530
Interest income from impaired loans for year ended	10,232	11,736
Outstanding fixed-rate origination commitments	400,426	425,130
Gross loans serviced for others	$ 77,958	$ 77,119

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- References

No definition available.

+ Details

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X

- Definition

Financing Receivable, Average Balance of Impaired Loans

+ References

No definition available.

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- Definition

Loans and Leases Receivable, Loan Origination Commitments Outstanding

+ References

No definition available.

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- Definition

Loans Serviced for Others

+ References

No definition available.

+ Details

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X

- Definition

Recorded investment in impaired loans

+ References

No definition available.

+ Details

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