v3.26.1
FAIR VALUE MEASUREMENTS - Quantitative Information (Details) - Nonrecurring - Significant Unobservable Inputs (Level 3)
Jun. 30, 2026
Sep. 30, 2025
Appraisal of Collateral | Appraisal Adjustments | Minimum    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.25 0.25
Foreclosed Real Estate, Net 0.25 0.25
Appraisal of Collateral | Appraisal Adjustments | Maximum    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.25 0.25
Foreclosed Real Estate, Net 0.25 0.25
Appraisal of Collateral | Appraisal Adjustments | Weighted average    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.25 0.25
Foreclosed Real Estate, Net 0.25 0.25
Sales approach | Costs to Sell | Minimum    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.06 0.06
Foreclosed Real Estate, Net 0.06 0.06
Sales approach | Costs to Sell | Maximum    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.10 0.10
Foreclosed Real Estate, Net 0.10 0.10
Sales approach | Costs to Sell | Weighted average    
FAIR VALUE MEASUREMENTS    
Individually Evaluated Loans (collateral dependent) 0.08 0.08
Foreclosed Real Estate, Net 0.08 0.08