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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2015 USD ($) contract	Dec. 31, 2014 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	8	40
Pre-Modification Outstanding Recorded Investment	$ 1,694	$ 10,935
Troubled debt restructuring, amount	$ 1,694	$ 10,935
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	3	35
Pre-Modification Outstanding Recorded Investment	$ 729	$ 9,600
Troubled debt restructuring, amount	$ 729	$ 9,600
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 718
Troubled debt restructuring, amount	$ 0	$ 718
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 532
Troubled debt restructuring, amount	$ 0	$ 532
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	5	0
Pre-Modification Outstanding Recorded Investment	$ 965	$ 0
Troubled debt restructuring, amount	$ 965	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 85
Troubled debt restructuring, amount	$ 0	$ 85

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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=49124121&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=49124121&loc=SL6953676-111524

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Pre-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=49124121&loc=SL6953676-111524

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