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Loans Held For Investment: Summary of Troubled Debt Restructurings by Nonaccrual Versus Accrual Status (Details 8)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of modified loans | loan 10 11
Restructured loans on non-accrual status $ 3,344 $ 3,392
Restructured loans on accrual status 1,425 1,788
Restructured loans 4,769 5,180
Mortgage loans, Single-family    
Financing Receivable, Modifications [Line Items]    
Restructured loans on non-accrual status 3,280 3,328
Restructured loans on accrual status 1,425 1,788
Commercial business loans    
Financing Receivable, Modifications [Line Items]    
Restructured loans on non-accrual status $ 64 $ 64
Substandard    
Financing Receivable, Modifications [Line Items]    
Number of modified loans | loan 9 9
Restructured loans on non-accrual status $ 3,400 $ 3,400
Substandard | Restructured loans on accrual status    
Financing Receivable, Modifications [Line Items]    
Number of modified loans | loan 1 1
Restructured loans on accrual status $ 1,400 $ 1,400
Special Mention | Restructured loans on accrual status    
Financing Receivable, Modifications [Line Items]    
Number of modified loans | loan   1
Restructured loans on accrual status   $ 389