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Loans Receivable (excluding Covered Loans) (Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 825 428
Pre-Modification Outstanding Recorded Investment $ 212,297 $ 134,482
Post-Modification Outstanding Recorded Investment 212,297 134,482
Loan Modification, Basis Point Reduction, Minimum 100.00%  
Loan Modification, Basis Point Reduction, Maximum 200.00%  
Single Family Residential Loans as Percentage of Restructured Loans 80.30%  
Residential Portfolio Segment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 700 379
Pre-Modification Outstanding Recorded Investment 183,492 101,137
Post-Modification Outstanding Recorded Investment 183,492 101,137
Construction, Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 24 3
Pre-Modification Outstanding Recorded Investment 6,409 1,328
Post-Modification Outstanding Recorded Investment 6,409 1,328
Construction, Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 1 0
Pre-Modification Outstanding Recorded Investment 1,196 0
Post-Modification Outstanding Recorded Investment 1,196 0
Land, Acquisition and Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 25 3
Pre-Modification Outstanding Recorded Investment 8,524 5,943
Post-Modification Outstanding Recorded Investment 8,524 5,943
Land, Consumer Lot Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 65 28
Pre-Modification Outstanding Recorded Investment 9,017 3,715
Post-Modification Outstanding Recorded Investment 9,017 3,715
Multi Family Housing [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 5 11
Pre-Modification Outstanding Recorded Investment 3,161 19,883
Post-Modification Outstanding Recorded Investment 3,161 19,883
Commercial Real Estate Portfolio Segment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 1 2
Pre-Modification Outstanding Recorded Investment 308 1,480
Post-Modification Outstanding Recorded Investment 308 1,480
Commercial and Industrial Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 1 1
Pre-Modification Outstanding Recorded Investment 5 918
Post-Modification Outstanding Recorded Investment 5 918
Home Equity Line of Credit [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 3 1
Pre-Modification Outstanding Recorded Investment 185 78
Post-Modification Outstanding Recorded Investment 185 78
Consumer Portfolio Segment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts 0 0
Pre-Modification Outstanding Recorded Investment 0 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0