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Loans Receivable and Allowance For Credit Losses (Modifications on Financing Receivables) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 46,271 $ 712 $ 56,867 $ 10,146
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.58% 0.01% 0.71% 0.13%
Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 40,302   $ 48,402  
Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 3,801 $ 623 5,484 $ 623
Extended Maturity and Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 2,168 89 2,981 9,523
One- to Four-Family Segment [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 5,618 $ 682 $ 7,906 $ 9,468
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.09% 0.01% 0.13% 0.15%
One- to Four-Family Segment [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 340   $ 470  
One- to Four-Family Segment [Member] | Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 3,110 $ 623 4,455 $ 623
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 2,168 59 2,981 8,845
One- to Four-Family Segment [Member] | Originated [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 5,095 $ 682 $ 7,196 $ 7,737
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.13% 0.02% 0.19% 0.19%
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 $ 340   $ 470  
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 3,110 $ 623 4,455 $ 623
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 1,645 59 2,271 7,114
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 523 $ 0 $ 710 $ 1,731
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.03% 0.00% 0.03% 0.08%
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   $ 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 $ 0 0 $ 0
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 523 0 710 1,731
One- to Four-Family Segment [Member] | Bulk Purchased [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0 $ 0 $ 0 $ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.00% 0.00% 0.00% 0.00%
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   $ 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 $ 0 0 $ 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 0 0 0
Commercial Segment [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 40,653 $ 30 $ 48,906 $ 678
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 2.13% 0.00% 2.57% 0.05%
Commercial Segment [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 39,962   $ 47,912  
Commercial Segment [Member] | Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 691 $ 0 994 $ 0
Commercial Segment [Member] | Extended Maturity and Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0 30 0 678
Commercial Segment [Member] | Commercial Real Estate [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 39,962 $ 0 $ 47,912 $ 192
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 2.32% 0.00% 2.78% 0.01%
Commercial Segment [Member] | Commercial Real Estate [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 39,962   $ 47,912  
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 $ 0 0 $ 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 0 0 0 192
Commercial Segment [Member] | Commercial and Industrial [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 691 $ 30 $ 994 $ 486
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.38% 0.02% 0.54% 0.37%
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   $ 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 691 $ 0 994 $ 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 0 30 0 486
Consumer Segment [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0 $ 0 $ 55 $ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.00% 0.00% 0.05% 0.00%
Consumer Segment [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0   $ 20  
Consumer Segment [Member] | Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0 $ 0 35 $ 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 0 0 0
Consumer Segment [Member] | Home Equity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0 $ 0 $ 55 $ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.00% 0.00% 0.05% 0.00%
Consumer Segment [Member] | Home Equity [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0   $ 20  
Consumer Segment [Member] | Home Equity [Member] | Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0 $ 0 35 $ 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 0 0 0
Consumer Segment [Member] | Other [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0 $ 0 $ 0 $ 0
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.00% 0.00% 0.00% 0.00%
Consumer Segment [Member] | Other [Member] | Payment Deferral [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0   $ 0  
Consumer Segment [Member] | Other [Member] | Extended Maturity [Member]        
Financing Receivable, Modified [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0 $ 0 0 $ 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 $ 0 $ 0 $ 0