v3.26.1
Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) - Fair Value, Inputs, Level 3 - Valuation, Market Approach
Jun. 30, 2026
Sep. 30, 2025
Appraised value less estimated selling costs    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Individually evaluated collateral-dependent loans, measurement input 0.08 0.08
Lower of appraised value or listing price less estimated selling costs    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
OREO and other repossessed assets, measurement input 0.08 0.08