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Loans Receivable (excluding Covered Loans) (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 Contracts | Mar. 31, 2012 Contracts | Mar. 31, 2013 Contracts | Mar. 31, 2012 Contracts | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 140 | 344 | 251 | 569 |
Pre-Modification Outstanding Recorded Investment | $ 37,609 | $ 78,319 | $ 68,654 | $ 140,753 |
Post-Modification Outstanding Recorded Investment | 37,609 | 78,319 | 68,654 | 140,753 |
Loan Modification, Basis Point Reduction, Minimum |  |  | 1.00% |  |
Loan Modification, Basis Point Reduction, Maximum |  |  | 2.00% |  |
Single Family Residential Loans as Percentage of Restructured Loans |  |  |  |  | 86.40%
Single-Family Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 130 | 312 | 230 | 491 |
Pre-Modification Outstanding Recorded Investment | 36,059 | 68,460 | 63,146 | 121,145 |
Post-Modification Outstanding Recorded Investment | 36,059 | 68,460 | 63,146 | 121,145 |
Construction - Speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 12 | 1 | 23 |
Pre-Modification Outstanding Recorded Investment | 0 | 4,049 | 2,492 | 7,428 |
Post-Modification Outstanding Recorded Investment | 0 | 4,049 | 2,492 | 7,428 |
Construction - Custom [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 0 | 0 |
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Land - Acquisition & Development [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 4 | 0 | 26 |
Pre-Modification Outstanding Recorded Investment | 0 | 1,823 | 0 | 6,173 |
Post-Modification Outstanding Recorded Investment | 0 | 1,823 | 0 | 6,173 |
Land - Consumer Lot Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 9 | 14 | 18 | 25 |
Pre-Modification Outstanding Recorded Investment | 1,350 | 2,116 | 2,761 | 3,824 |
Post-Modification Outstanding Recorded Investment | 1,350 | 2,116 | 2,761 | 3,824 |
Multi-Family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 2 | 1 | 2 |
Pre-Modification Outstanding Recorded Investment | 0 | 1,871 | 55 | 1,871 |
Post-Modification Outstanding Recorded Investment | 0 | 1,871 | 55 | 1,871 |
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 0 | 1 |
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 308 |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 308 |
Commercial & Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 0 | 1 |
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 4 |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 4 |
HELOC [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 1 | 0 | 1 | 0 |
Pre-Modification Outstanding Recorded Investment | 200 | 0 | 200 | 0 |
Post-Modification Outstanding Recorded Investment | 200 | 0 | 200 | 0 |
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 0 | 0 |
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0 |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0 |

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