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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) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
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, one-to-four family    
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, multi-family    
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, commercial    
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, 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 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 13 31
Fair Value, Inputs, Level 2 | Mortgage loans, one-to-four family    
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 | Mortgage loans, multi-family    
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, commercial    
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 | 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 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 13 31
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 14,543 20,215
Fair Value, Inputs, Level 3 | Mortgage loans, one-to-four family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring 2,119 2,663
Fair Value, Inputs, Level 3 | Mortgage loans, multi-family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, estimated fair value, nonrecurring   3,261
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 3,802 5,388
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 565 654
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 379 383
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 6,876 12,361
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 $ 7,667 $ 7,854