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Loans Held for Investment (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance $ 6,948   $ 7,228 $ 7,355    
Total individually evaluated allowance 132   157 176    
Total loan loss allowance 7,080 $ 7,061 7,385 7,531 $ 8,075 $ 8,039
Mortgage loans, Single-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 2,514   2,632 2,960    
Total individually evaluated allowance 123   151 161    
Total loan loss allowance 2,637 2,679 2,783 3,121 3,303 3,601
Mortgage loans, Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 3,300   3,492 3,312    
Total individually evaluated allowance 0     0    
Total loan loss allowance 3,300 3,280 3,492 3,312 3,295 3,420
Mortgage loans, Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 1,042   1,030 966    
Total individually evaluated allowance 0     0    
Total loan loss allowance 1,042 1,019 1,030 966 933 879
Mortgage loans, Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 63   47 94    
Total individually evaluated allowance 0     0    
Total loan loss allowance 63 48 47 94 504 96
Mortgage loans other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 3   3      
Total individually evaluated allowance 0          
Total loan loss allowance 3 3 3      
Commercial business loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 18   18 16    
Total individually evaluated allowance 9   6 15    
Total loan loss allowance 27 26 24 31 32 36
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total collectively evaluated allowance 8   6 7    
Total individually evaluated allowance 0     0    
Total loan loss allowance $ 8 $ 6 $ 6 $ 7 $ 8 $ 7