Loans Receivable and Allowance for Credit Losses (Financial Effect of Modifications) (Details) - One- to Four-Family Segment [Member]	3 Months Ended
	Dec. 31, 2023
Originated [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	23 months
Financing Receivable, Modified, Payment Deferral, Period	4 months
Correspondent Purchased [Member]
Financing Receivable, Modified [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	12 months
Financing Receivable, Modified, Payment Deferral, Period	4 months