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Investment Securities: Mortgage Backed Securities Policy (Details)
12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Mortgage backed securities, principal payments received $ 27,200,000 $ 15,100,000 $ 4,800,000
Available-for-sale Securities, Restricted 7,496,000 9,318,000  
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Available-for-sale $ 53,900,000 34,500,000 41,700,000
Other-than-temporary impairments, investments   0 $ 0
Common Stock      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Restricted   $ 147,000  
Private issue CMO | Available for sale      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held | security   777,000