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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, 2018
Mar. 31, 2017
Jun. 30, 2017
Financing Receivable, Modifications [Line Items]      
Loan Restructuring, Trial Modifications, Amount $ 2,200    
Number of Loans Modified as Troubled Debt Restructurings in Default $ 0 $ 0  
Restructured loans on non-accrual status $ 3,150   $ 3,126
Restructured loans on accrual status 2,202   506
Restructured loans 5,352   3,632
Mortgage loans, Single-family      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status 3,092   3,061
Restructured loans on accrual status 2,202   506
Commercial Business Loans      
Financing Receivable, Modifications [Line Items]      
Restructured loans on non-accrual status $ 58   $ 65