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Loans Held For Investment: Schedule of Troubled Debt Restructurings by Nonaccrual Versus Accrual Status (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Financing Receivable, Modifications [Line Items]        
Number of modified loans | loan 11 10 2 0
Loans receivable, restructured loans, accrual status $ 3,392 $ 3,126 $ 3,392 $ 3,126
Restructured loans on accrual status 1,788 506 1,788 506
Restructured loans 5,180 3,632 5,180 3,632
Mortgage loans, Single-family        
Financing Receivable, Modifications [Line Items]        
Loans receivable, restructured loans, accrual status 3,328 3,061 3,328 3,061
Restructured loans on accrual status 1,788 506 1,788 506
Commercial Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Loans receivable, restructured loans, accrual status $ 64 $ 65 64 65
Substandard [Member]        
Financing Receivable, Modifications [Line Items]        
Number of modified loans | loan 9 9    
Loans receivable, restructured loans, accrual status $ 3,400 $ 3,100 3,400 $ 3,100
Restructured loans on accrual status $ 1,400   $ 1,400  
Substandard [Member] | Restructured loans on accrual status        
Financing Receivable, Modifications [Line Items]        
Number of modified loans | loan 1