v3.26.1
Fair Value Of Financial Instruments (Narrative) (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
Mar. 31, 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 $ 50,200   $ 50,200
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   0
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 $ 810,902 $ 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 50,200   50,200
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   0
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] | Lack of Marketability [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.08   0.10
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Lack of Marketability [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] | Weighted Average [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable, measurement input 0.19   0.22