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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, 2023
Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans with individually evaluated allowance $ 703 $ 1,300
Mortgage servicing assets 67 90
Total assets 770 1,390
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans with individually evaluated allowance 0 0
Mortgage servicing assets 0 0
Total assets 0 0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans with individually evaluated allowance 0 251
Mortgage servicing assets 0 0
Total assets 0 251
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans with individually evaluated allowance 703 1,049
Mortgage servicing assets 67 90
Total assets $ 770 $ 1,139