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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016 USD ($) contract	Jun. 30, 2015 USD ($) contract	Jun. 30, 2016 USD ($) contract	Jun. 30, 2015 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	9	10	24	71
Pre-modification outstanding recorded investment	$ 3,050	$ 1,814	$ 5,845	$ 19,308
Post-modification outstanding recorded investment	$ 3,050	$ 1,814	$ 5,845	$ 19,308
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	7	8	17	57
Pre-modification outstanding recorded investment	$ 1,492	$ 1,611	$ 3,322	$ 13,875
Post-modification outstanding recorded investment	$ 1,492	$ 1,611	$ 3,322	$ 13,875
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	2
Pre-modification outstanding recorded investment			$ 0	$ 718
Post-modification outstanding recorded investment			$ 0	$ 718
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	2
Pre-modification outstanding recorded investment			$ 0	$ 532
Post-modification outstanding recorded investment			$ 0	$ 532
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	2	0	6
Pre-modification outstanding recorded investment	$ 0	$ 203	$ 0	$ 923
Post-modification outstanding recorded investment	$ 0	$ 203	$ 0	$ 923
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	0	7	3
Pre-modification outstanding recorded investment	$ 1,558	$ 0	$ 2,523	$ 3,175
Post-modification outstanding recorded investment	$ 1,558	$ 0	$ 2,523	$ 3,175
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	1
Pre-modification outstanding recorded investment			$ 0	$ 85
Post-modification outstanding recorded investment			$ 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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+ 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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