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Loans Held For Investment (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance $ 168   $ 157 $ 15    
Total collectively evaluated allowance 6,893   7,228 8,060    
Total loan loss allowance 7,061 $ 7,155 7,385 8,075 $ 8,063 $ 8,039
Mortgage loans, Single-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 159   151 0    
Total collectively evaluated allowance 2,520   2,632 3,303    
Total loan loss allowance 2,679 2,741 2,783 3,303 3,579 3,601
Mortgage loans, Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 0     0    
Total collectively evaluated allowance 3,280   3,492 3,295    
Total loan loss allowance 3,280 3,336 3,492 3,295 3,431 3,420
Mortgage loans, Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 0     0    
Total collectively evaluated allowance 1,019   1,030 933    
Total loan loss allowance 1,019 1,012 1,030 933 875 879
Construction Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 0     0    
Total collectively evaluated allowance 48   47 504    
Total loan loss allowance 48 38 47 504 140 96
Mortgage loans other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 0          
Total collectively evaluated allowance 3   3      
Total loan loss allowance 3 3 3      
Commercial business loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 9   6 15    
Total collectively evaluated allowance 17   18 17    
Total loan loss allowance 26 19 24 32 31 36
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total individually evaluated allowance 0     0    
Total collectively evaluated allowance 6   6 8    
Total loan loss allowance $ 6 $ 6 $ 6 $ 8 $ 7 $ 7