Loans Receivable And Allowance for Credit Losses (Modifications on Financing Receivables) (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($)
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 19,735
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.25%
Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	8,285
Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	1,885
Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	9,553
Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	12
One- to Four-Family Segment [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 10,593
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.17%
One- to Four-Family Segment [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
One- to Four-Family Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	1,885
One- to Four-Family Segment [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	8,708
One- to Four-Family Segment [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 8,539
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.22%
One- to Four-Family Segment [Member] | Originated [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
One- to Four-Family Segment [Member] | Originated [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Originated [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Originated [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	1,547
One- to Four-Family Segment [Member] | Originated [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	6,992
One- to Four-Family Segment [Member] | Originated [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 2,054
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.09%
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	338
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	1,716
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.00%
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 9,053
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.60%
Commercial Segment [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Commercial Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	8,196
Commercial Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	845
Commercial Segment [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	12
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 8,388
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.61%
Commercial Segment [Member] | Commercial Real Estate [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Commercial Segment [Member] | Commercial Real Estate [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial Real Estate [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	8,196
Commercial Segment [Member] | Commercial Real Estate [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial Real Estate [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	192
Commercial Segment [Member] | Commercial Real Estate [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 665
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.51%
Commercial Segment [Member] | Commercial and Industrial [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Commercial Segment [Member] | Commercial and Industrial [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial and Industrial [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial and Industrial [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial and Industrial [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	653
Commercial Segment [Member] | Commercial and Industrial [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	12
Consumer Segment [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 89
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.08%
Consumer Segment [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Consumer Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	89
Consumer Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Home Equity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 89
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.09%
Consumer Segment [Member] | Home Equity [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Consumer Segment [Member] | Home Equity [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Home Equity [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	89
Consumer Segment [Member] | Home Equity [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Home Equity [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Home Equity [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Other [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.00%
Consumer Segment [Member] | Other [Member] | Principal Forgiveness [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0
Consumer Segment [Member] | Other [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Other [Member] | Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Other [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Other [Member] | Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Other [Member] | Extended Maturity, Payment Delay, and Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0