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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) contract | Mar. 31, 2015 USD ($) contract | Mar. 31, 2016 USD ($) contract | Mar. 31, 2015 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 21 | 15 | 61
Pre-Modification Outstanding Recorded Investment | $ 1,101 | $ 6,559 | $ 2,795 | $ 17,494
Troubled debt restructuring, amount | $ 1,101 | $ 6,559 | $ 2,795 | $ 17,494
Single-family residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 14 | 10 | 49
Pre-Modification Outstanding Recorded Investment | $ 1,101 | $ 2,664 | $ 1,830 | $ 12,264
Troubled debt restructuring, amount | $ 1,101 | $ 2,664 | $ 1,830 | $ 12,264
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 | 4 | 0 | 6
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 720 | $ 0 | $ 1,252
Troubled debt restructuring, amount | $ 0 | $ 720 | $ 0 | $ 1,252
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts | contract |  | 3 | 5 | 3
Pre-Modification Outstanding Recorded Investment |  | $ 3,175 | $ 965 | $ 3,175
Troubled debt restructuring, amount |  | $ 3,175 | $ 965 | $ 3,175
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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- 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=49124121&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=49124121&loc=SL6953676-111524 + Details
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