Loans Receivable And Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of potential loan purchases reviewed for compliance with internal underwriting standards, minimum	25.00%
Loan-to-value ratio for securing multi-family and commercial real estate loans, maximum	80.00%
Performing regulatory nonaccrual TDRs	$ 7,900,000	$ 11,200,000
Loans with unpaid principal amounts on nonaccrual status	28,700,000	31,800,000
Net charge-offs	856,000
Regulatory net charge-offs	369,000
Regulatory Nonaccrual TDRs, Originated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Regulatory nonaccrual TDRs	8,300,000	10,000,000
Regulatory Nonaccrual TDRs, Purchased [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Regulatory nonaccrual TDRs	$ 1,400,000	$ 2,400,000