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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, 2012 Contracts | Mar. 31, 2011 Contracts | Mar. 31, 2012 Contracts | Mar. 31, 2011 Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 344 | 31 | 569 | 184
Pre-Modification Outstanding Recorded Investment | $ 78,319 | $ 8,468 | $ 140,753 | $ 57,306
Post-Modification Outstanding Recorded Investment | 78,319 | 8,468 | 140,753 | 57,306
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 | 82.60% |  | 82.60% |
Residential Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 312 | 26 | 491 | 165
Pre-Modification Outstanding Recorded Investment | 68,460 | 7,019 | 121,145 | 46,488
Post-Modification Outstanding Recorded Investment | 68,460 | 7,019 | 121,145 | 46,488
Construction, Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 12 | 0 | 23 | 0
Pre-Modification Outstanding Recorded Investment | 4,049 | 0 | 7,428 | 0
Post-Modification Outstanding Recorded Investment | 4,049 | 0 | 7,428 | 0
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 and Development [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 4 | 0 | 26 | 0
Pre-Modification Outstanding Recorded Investment | 1,823 | 0 | 6,173 | 0
Post-Modification Outstanding Recorded Investment | 1,823 | 0 | 6,173 | 0
Land, Consumer Lot Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 14 | 3 | 25 | 13
Pre-Modification Outstanding Recorded Investment | 2,116 | 498 | 3,824 | 2,636
Post-Modification Outstanding Recorded Investment | 2,116 | 498 | 3,824 | 2,636
Multi Family Housing [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 2 | 2 | 2 | 6
Pre-Modification Outstanding Recorded Investment | 1,871 | 951 | 1,871 | 8,182
Post-Modification Outstanding Recorded Investment | 1,871 | 951 | 1,871 | 8,182
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 308 | 0
Post-Modification Outstanding Recorded Investment | 0 | 0 | 308 | 0
Commercial and Industrial Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Contracts (in contracts) | 0 | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | 0 | 0 | 4 | 0
Post-Modification Outstanding Recorded Investment | 0 | 0 | 4 | 0
Home Equity Line of Credit [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
Consumer Portfolio Segment [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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