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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	11	14
Pre-modification outstanding recorded investment	$ 9,268	$ 2,566
Post-modification outstanding recorded investment	$ 9,268	$ 2,566
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	8	12
Pre-modification outstanding recorded investment	$ 2,012	$ 2,134
Post-modification outstanding recorded investment	$ 2,012	$ 2,134
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	0	1
Pre-modification outstanding recorded investment	$ 0	$ 204
Post-modification outstanding recorded investment	$ 0	$ 204
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	3	0
Pre-modification outstanding recorded investment	$ 7,256	$ 0
Post-modification outstanding recorded investment	$ 7,256	$ 0
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	0	1
Pre-modification outstanding recorded investment	$ 0	$ 228
Post-modification outstanding recorded investment	$ 0	$ 228

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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://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=84173941&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=84173941&loc=SL6953676-111524

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- Definition

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=84173941&loc=SL6953676-111524

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