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Loans Held For Investment: Schedule of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance $ 7,355   $ 7,938 $ 8,260    
Loans receivable, individually evaluated allowance 176   101 15    
Total loan loss allowance 7,531 $ 8,075 8,039 8,275 $ 8,391 $ 8,670
Mortgage loans, Single-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 2,960   3,515 3,909    
Loans receivable, individually evaluated allowance 161   86 0    
Total loan loss allowance 3,121 3,303 3,601 3,909 4,283 4,933
Mortgage loans, Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 3,312   3,420 3,367    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 3,312 3,295 3,420 3,367 3,156 2,800
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 966   879 868    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 966 933 879 868 836 848
Construction Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 94   96 80    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 94 504 96 80 65 31
Mortgage Loans, Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance       5    
Loans receivable, individually evaluated allowance       0    
Total loan loss allowance       5 6 7
Commercial Business Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 16   21 24    
Loans receivable, individually evaluated allowance 15   15 15    
Total loan loss allowance 31 32 36 39 37 43
Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 7   7 7    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance $ 7 $ 8 $ 7 $ 7 $ 8 $ 8