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Fair Value Measurements: Balances of assets measured at estimated fair value on a non-recurring basis, and total losses resulting from estimated fair value adjustments (Details) - Nonrecurring - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring $ 1,168 $ 122
Commercial business    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 1,168 122
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0 0
Fair Value, Inputs, Level 1 | Commercial business    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0 0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0 0
Fair Value, Inputs, Level 2 | Commercial business    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0 0
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 1,168 122
Fair Value, Inputs, Level 3 | Commercial business    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring $ 1,168 $ 122