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Investment Securities: Mortgage Backed Securities Policy (Details)
security in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
security
Mar. 31, 2017
USD ($)
Jun. 30, 2017
security
Schedule of Available-for-sale Securities [Line Items]            
Principal payments from investment securities available for sale $ 7,613,000   $ 3,536,000 $ 19,335,000 $ 10,832,000  
Other-than-temporary impairments, investments 0 $ 0 0 0 0  
U.S. government sponsored enterprise MBS            
Schedule of Available-for-sale Securities [Line Items]            
Proceeds from Sale of Available-for-sale Securities, Debt 0     0    
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 12,600,000   $ 11,000,000 51,100,000 $ 11,000,000  
Small Business Administration Loan Pool Securities [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity $ 3,000,000     $ 3,000,000    
Available for sale | Private issue CMO            
Schedule of Available-for-sale Securities [Line Items]            
Number of investment securities held | security 28     28   77