v3.26.1
Loans Receivable And Allowance For Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2027
Sep. 30, 2025
Loans Receivable [Line Items]        
Loan-to-value ratio securing commercial real estate loans, maximum 85.00%      
Debt service coverage ratio for commercial real estate loans, minimum 1.15      
Loan-to-value ratio securing commercial construction loans, maximum 80.00%      
Outstanding Loan Balance for Commercial Total Relationship Annual Review Minimum $ 2,500      
Loans receivable 8,166,762     $ 8,111,961
Amortized cost of loans in process of foreclosure 2,300     1,000
Carrying value of residential OREO 0     197
Financing receivable, gross charge-offs on modified loans   $ 0    
Financing Receivable, Modified, Commitment to Lend 0 $ 0    
Off-balance sheet credit exposures 990,700     821,600
One- to Four-Family Segment [Member] | Originated [Member]        
Loans Receivable [Line Items]        
Financing receivable, gross charge-offs on modified loans 12      
Forecast [Member]        
Loans Receivable [Line Items]        
Unemployment Rate     4.60%  
Doubtful [Member]        
Loans Receivable [Line Items]        
Loans receivable $ 0     $ 0