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Fair Value of Financial Instruments - Corporations assets measured at fair value at the dates indicated on a nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing assets $ 129 $ 88
Total assets 129 88
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing assets 0 0
Total assets 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing assets 0 0
Total assets 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing assets 129 88
Total assets $ 129 $ 88