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Fair Value Measurements - Unobservable (Level 3) inputs (Details) - Fair Value, Nonrecurring - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, Type [Extensible Enumeration] Foreclosed and repossessed assets Foreclosed and repossessed assets
Foreclosed and repossessed assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Unobservable Inputs $ 1,006 $ 625
Fair Value Measurements Nonrecurring Weighted Average Discount Applied 8.0 25.6
Foreclosed and repossessed assets | Third party appraisal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Valuation Technique Third party appraisal Third party appraisal
Foreclosed and repossessed assets | Third party appraisal | Measurement Input, Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Unobservable Inputs Marketability discount Marketability discount
Foreclosed and repossessed assets | Third party appraisal | Measurement Input, Discount Rate | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Range of discounts Applied 8.00% 25.60%
Foreclosed and repossessed assets | Third party appraisal | Measurement Input, Discount Rate | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Range of discounts Applied 8.20% 25.60%
Collateral dependent loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Unobservable Inputs $ 20,349 $ 24,368
Fair Value Measurements Nonrecurring Weighted Average Discount Applied 22.1 23.9
Collateral dependent loans | Collateral value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Valuation Technique Collateral value Collateral value
Collateral dependent loans | Collateral value | Measurement Input, Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Unobservable Inputs Marketability discount Marketability discount
Collateral dependent loans | Collateral value | Measurement Input, Discount Rate | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Range of discounts Applied 14.90% 4.30%
Collateral dependent loans | Collateral value | Measurement Input, Discount Rate | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurements Nonrecurring Range of discounts Applied 100.00% 100.00%