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Loans Held For Investment: Schedule of Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance $ 8,060   $ 7,938 $ 8,279    
Loans receivable, individually evaluated allowance 15   101 112    
Total loan loss allowance 8,075 $ 8,063 8,039 8,391 $ 8,725 $ 8,670
Mortgage loans, Single-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 3,303   3,515 4,186    
Loans receivable, individually evaluated allowance 0   86 97    
Total loan loss allowance 3,303 3,579 3,601 4,283 4,575 4,933
Mortgage loans, Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 3,295   3,420 3,156    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 3,295 3,431 3,420 3,156 3,186 2,800
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 933   879 836    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 933 875 879 836 854 848
Construction Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 504   96 65    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance 504 140 96 65 53 31
Mortgage Loans, Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance       6    
Loans receivable, individually evaluated allowance       0    
Total loan loss allowance       6 7 7
Commercial Business Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 17   21 22    
Loans receivable, individually evaluated allowance 15   15 15    
Total loan loss allowance 32 31 36 37 42 43
Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, collectively evaluated allowance 8   7 8    
Loans receivable, individually evaluated allowance 0     0    
Total loan loss allowance $ 8 $ 7 $ 7 $ 8 $ 8 $ 8