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Loans Receivable (excluding Covered Loans) - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) contract | Jun. 30, 2014 USD ($) contract | Jun. 30, 2015 USD ($) contract | Jun. 30, 2014 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 10 | 58 | 71 | 221
Pre-modification outstanding recorded investment | $ 1,814 | $ 13,420 | $ 19,308 | $ 51,500
Post-modification outstanding recorded investment | $ 1,814 | $ 13,420 | $ 19,308 | $ 51,500
Single-Family Residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 8 | 48 | 57 | 199
Pre-modification outstanding recorded investment | $ 1,611 | $ 10,693 | $ 13,875 | $ 45,132
Post-modification outstanding recorded investment | $ 1,611 | $ 10,693 | $ 13,875 | $ 45,132
Construction - Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract |  |  | 2 | 0
Pre-modification outstanding recorded investment |  |  | $ 718 | $ 0
Post-modification outstanding recorded investment |  |  | $ 718 | $ 0
Construction - Custom [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract |  |  | 2 | 0
Pre-modification outstanding recorded investment |  |  | $ 532 | $ 0
Post-modification outstanding recorded investment |  |  | $ 532 | $ 0
Land - Acquisition & Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 0 | 3 |  |
Pre-modification outstanding recorded investment | $ 0 | $ 756 |  |
Post-modification outstanding recorded investment | $ 0 | $ 756 |  |
Land - Consumer Lot Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 2 | 5 | 6 | 10
Pre-modification outstanding recorded investment | $ 203 | $ 573 | $ 923 | $ 1,746
Post-modification outstanding recorded investment | $ 203 | $ 573 | $ 923 | $ 1,746
Multi-Family Housing Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract |  |  | 0 | 2
Pre-modification outstanding recorded investment |  |  | $ 0 | $ 1,201
Post-modification outstanding recorded investment |  |  | $ 0 | $ 1,201
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract | 0 | 2 | 3 | 3
Pre-modification outstanding recorded investment | $ 0 | $ 1,398 | $ 3,175 | $ 2,197
Post-modification outstanding recorded investment | $ 0 | $ 1,398 | $ 3,175 | $ 2,197
HELOC [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract |  |  | 0 | 1
Pre-modification outstanding recorded investment |  |  | $ 0 | $ 261
Post-modification outstanding recorded investment |  |  | $ 0 | $ 261
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of contracts (in contracts) | contract |  |  | 1 | 3
Pre-modification outstanding recorded investment |  |  | $ 85 | $ 207
Post-modification outstanding recorded investment |  |  | $ 85 | $ 207

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