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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	1	11
Pre-Modification Outstanding Recorded Investment	$ 283	$ 9,268
Post-Modification Outstanding Recorded Investment	$ 283	$ 9,268
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	1	8
Pre-Modification Outstanding Recorded Investment	$ 283	$ 2,012
Post-Modification Outstanding Recorded Investment	$ 283	$ 2,012
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 7,256
Post-Modification Outstanding Recorded Investment	$ 0	$ 7,256

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+ References

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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