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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
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Financing Receivable, Modifications [Line Items]      
Number of Loans Modified as Troubled Debt Restructurings in Default $ 0 $ 0  
Restructured loans on non-accrual status $ 4,622   $ 5,603
Restructured loans on accrual status 1,114   989
Restructured loans 5,736   6,592
Mortgage loans, Single-family      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status 3,002   2,902
Restructured loans on accrual status 1,114   989
Mortgage loans, Multi-family      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status 1,542   1,593
Commercial Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status 0   1,019
Commercial Business Loans      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status $ 78   $ 89