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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