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Loans Held For Investment: Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Loans held for investment $ 908,794,000 $ 916,432,000 $ 908,794,000
Loan interest income added to negative amortization loan balance $ 0 $ 0  
Fixed-rate loans as a percentage of total loans held for investment 2.00% 3.00% 2.00%
Loans deemed uncollectible, period of delinquency     90 days
First Trust Deed Loans      
Loans deemed uncollectible, period of delinquency     150 days
Commercial Business or Second Trust Deed Loans      
Loans deemed uncollectible, period of delinquency     120 days
Troubled Debt Restructurings      
Loans deemed uncollectible, period of delinquency     90 days
Bankruptcy      
Loans deemed uncollectible, period of delinquency     60 days
Maximum      
Segregated restructured loans, period of delinquency     90 days
Maximum | Bankruptcy      
Allowance for loan losses, pooling method, period of delinquency     60 days
Mortgage loans, Multi-family      
Loans held for investment $ 476,008,000 $ 479,959,000 $ 476,008,000
Mortgage loans, Single-family      
Loans held for investment 314,808,000 322,197,000 314,808,000
Mortgage loans, Commercial real estate      
Loans held for investment $ 109,726,000 $ 97,562,000 $ 109,726,000