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Investment Securities: Mortgage Backed Securities Policy (Details)
security in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
security
Schedule of Available-for-sale Securities [Line Items]          
Principal payments from investment securities available for sale $ 3,536 $ 1,062      
Other-than-temporary impairments, investments 0 0 $ 0 $ 0  
U.S. government sponsored enterprise MBS          
Schedule of Available-for-sale Securities [Line Items]          
Principal payments from investment securities available for sale     10,832 2,409  
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity $ 11,000 $ 10,600 $ 11,000 $ 20,800  
Available for sale | Private issue CMO          
Schedule of Available-for-sale Securities [Line Items]          
Number of investment securities held | security         6