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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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- Definition 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 + Details
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- Definition 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 + Details
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