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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	12	8	23	22
Pre-modification outstanding recorded investment	$ 2,183	$ 1,712	$ 11,451	$ 4,278
Post-modification outstanding recorded investment	$ 2,183	$ 1,712	$ 11,451	$ 4,278
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract	12	8	20	20
Pre-modification outstanding recorded investment	$ 2,183	$ 1,712	$ 4,195	$ 3,846
Post-modification outstanding recorded investment	$ 2,183	$ 1,712	$ 4,195	$ 3,846
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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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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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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