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Loans Held For Investment: Schedule of Troubled Debt Restructurings by Nonaccrual Versus Accrual Status (Details) - USD ($)
$ / shares in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Financing Receivable, Modifications [Line Items]      
Number of Loans Modified as Troubled Debt Restructurings in Default $ 0 $ 0  
Restructured loans on non-accrual status $ 3,781   $ 3,308
Restructured loans on accrual status 0   1,290
Restructured loans 3,781   4,598
Mortgage loans, Single-family      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status 3,711   3,232
Restructured loans on accrual status 0   1,290
Commercial Business Loans      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status $ 70   $ 76