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Fair Value Measurements: Balances of Assets and Liabilities Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
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 | Mortgage loans, commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   0
Fair Value, Inputs, Level 1 | Mortgage loans, land    
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 | Consumer loans, home equity and second mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   0
Fair Value, Inputs, Level 1 | Commercial business loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0  
Fair Value, Inputs, Level 1 | Total impaired loans    
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 | Private label residential    
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 | OREO and other repossessed items    
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 3 125
Fair Value, Inputs, Level 2 | Mortgage loans, commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   0
Fair Value, Inputs, Level 2 | Mortgage loans, land    
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 | Consumer loans, home equity and second mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   0
Fair Value, Inputs, Level 2 | Commercial business loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 0  
Fair Value, Inputs, Level 2 | Total impaired loans    
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 | Private label residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 3 125
Fair Value, Inputs, Level 2 | OREO and other repossessed items    
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 2,139 5,987
Fair Value, Inputs, Level 3 | Mortgage loans, commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   1,880
Fair Value, Inputs, Level 3 | Mortgage loans, land    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 119 697
Fair Value, Inputs, Level 3 | Consumer loans, home equity and second mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   109
Fair Value, Inputs, Level 3 | Commercial business loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 107  
Fair Value, Inputs, Level 3 | Total impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 226 2,686
Fair Value, Inputs, Level 3 | Private label residential    
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 | OREO and other repossessed items    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring $ 1,913 $ 3,301