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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($) contract	Mar. 31, 2016 USD ($) contract	Mar. 31, 2017 USD ($) contract	Mar. 31, 2016 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	8	7	22	15
Pre-modification outstanding recorded investment	$ 1,712	$ 1,101	$ 4,278	$ 2,795
Post-modification outstanding recorded investment	$ 1,712	$ 1,101	$ 4,278	$ 2,795
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	8	7	20	10
Pre-modification outstanding recorded investment	$ 1,712	$ 1,101	$ 3,846	$ 1,830
Post-modification outstanding recorded investment	$ 1,712	$ 1,101	$ 3,846	$ 1,830
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			1	0
Pre-modification outstanding recorded investment			$ 204	$ 0
Post-modification outstanding recorded investment			$ 204	$ 0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	5
Pre-modification outstanding recorded investment			$ 0	$ 965
Post-modification outstanding recorded investment			$ 0	$ 965
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			1	0
Pre-modification outstanding recorded investment			$ 228	$ 0
Post-modification outstanding recorded investment			$ 228	$ 0

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Pre-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
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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