v3.26.1
Fair Value Of Financial Instruments (Narrative) (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Significant Unobservable Inputs (Level 3) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans individually evaluated for loss $ 51,900   $ 89,600
Significant Unobservable Inputs (Level 3) [Member] | One- to Four-Family Segment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
OREO 0   92
Significant Unobservable Inputs (Level 3) [Member] | Commercial Segment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
OREO $ 0   0
Significant Unobservable Inputs (Level 3) [Member] | Estimated Selling Costs [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.10    
OREO, measurement input 0.10    
Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure $ 785,410 $ 868,142  
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure 0 $ 0  
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans individually evaluated for loss 51,900   89,600
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | One- to Four-Family Segment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
OREO 0   92
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Segment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
OREO $ 0   $ 0
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Estimated Selling Costs [Member] | Commercial Segment [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.08   0.08
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Estimated Selling Costs [Member] | Commercial Segment [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.83   0.63
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Estimated Selling Costs [Member] | Commercial Segment [Member] | Weighted Average [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.26   0.10
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Lack of Marketability [Member] | Commercial Segment [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.10   0.10
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Lack of Marketability [Member] | Commercial Segment [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 1   0.99
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Lack of Marketability [Member] | Commercial Segment [Member] | Weighted Average [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.18   0.12