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Loans Held For Investment: Summary of Allowance for Loan Losses (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance $ 129 $ 157 $ 32  
Total collectively evaluated allowance 7,026 7,228 8,031  
Total loan loss allowance 7,155 7,385 8,063 $ 8,039
Mortgage loans, Single-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 124 151 17  
Total collectively evaluated allowance 2,617 2,632 3,562  
Total loan loss allowance 2,741 2,783 3,579 3,601
Mortgage loans, Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 0 0 0  
Total collectively evaluated allowance 3,336 3,492 3,431  
Total loan loss allowance 3,336 3,492 3,431 3,420
Mortgage loans, Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 0 0 0  
Total collectively evaluated allowance 1,012 1,030 875  
Total loan loss allowance 1,012 1,030 875 879
Construction Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 0 0 0  
Total collectively evaluated allowance 38 47 140  
Total loan loss allowance 38 47 140 96
Mortgage loans other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 0 0    
Total collectively evaluated allowance 3 3    
Total loan loss allowance 3 3    
Commercial business loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 5 6 15  
Total collectively evaluated allowance 14 18 16  
Total loan loss allowance 19 24 31 36
Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total individually evaluated allowance 0 0 0  
Total collectively evaluated allowance 6 6 7  
Total loan loss allowance $ 6 $ 6 $ 7 $ 7