Loans Receivable And Allowance For Credit Losses (LTV And Credit Score Information For Originated And Purchased One-To Four-Family Loans And Originated Consumer Home Equity Loans) (Details)	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	764	764
Weighted average LTV	64.00%	64.00%
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	765	765
Weighted average LTV	65.00%	65.00%
One- to Four-Family Segment [Member] | Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	753	752
Weighted average LTV	64.00%	65.00%
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Weighted average credit score	755	753
Weighted average LTV	20.00%	18.00%