Loans Receivable and Allowance For Credit Losses (Modifications on Financing Receivables) (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 5,652
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.07%
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	0
Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	5,652
One- to Four-Family Segment [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 5,652
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.09%
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	0
One- to Four-Family Segment [Member] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	5,652
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 4,405
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.11%
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	0
One- to Four-Family Segment [Member] | Originated [Member] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	4,405
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 1,247
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.05%
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	0
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	1,247
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] | Combination Extended Maturity and Payment Deferral [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	$ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage	0.00%
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	0
Commercial Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Commercial Segment [Member] | Commercial Real Estate [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%
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	0
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] | Combination Extended Maturity and 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]
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%
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] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [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] | 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	0
Consumer Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	0
Consumer Segment [Member] | Combination 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]
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] | 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	0
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] | Combination 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]
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] | Combination Extended Maturity and Payment Deferral [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 0