Loans Receivable And Allowance For Credit Losses (Recorded Investment in Loans, Nonaccrual) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 29,143	$ 25,935
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	20,874	16,093
One- to Four-Family Segment [Member] | Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	7,411	9,038
Commercial Real Estate Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	0	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	848	792
Consumer Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, nonaccrual loans	$ 10	$ 12