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Loans Held For Investment: Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
loan
property
Jun. 30, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
property
Dec. 31, 2016
USD ($)
loan
property
Dec. 31, 2015
USD ($)
property
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2015
Number of Previously Foreclosed Properties Sold | property 2   1 3 3    
Financing Receivable, Modifications, Number of Contracts | loan       11   13  
Financing Receivable, Recorded Investment, Nonaccrual Status $ 3,781,000 $ 3,308,000   $ 3,781,000   $ 3,308,000  
Financing Receivable, Recorded Investment, Accrual Status 0 1,290,000   0   1,290,000  
Financing Receivable, Modifications, Recorded Investment $ 3,781,000 4,598,000   3,781,000   4,598,000  
Financing Receivable, Modifications, Number of Contracts, Extending Beyond Initial Maturity | loan 0            
Impaired Financing Receivable, Average Recorded Investment $ 10,591,000   $ 13,931,000 11,035,000 $ 14,629,000    
Loans held for investment 881,035,000 $ 855,476,000   $ 881,035,000   $ 855,476,000  
Loan interest income added to negative amortization loan balance $ 0   0        
Interest-only ARM loans as percent of loans held for investment 4.10% 7.60%   4.10%   7.60%  
Fixed-rate loans as a percentage of total loans held for investment 3.00%     3.00%     3.00%
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 34,000   $ 36,000 $ 103,000 137,000    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 37,000     $ 76,000 $ 104,000    
Percent of Total Restructured Loans on Current Status 46.00% 41.00%   46.00%   41.00%  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0 $ 0   $ 0   $ 0  
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      
Minimum              
Loan principal, increase due to negative amortization, as a percentage of original loan amount       110.00%      
Adjustable Rate Mortgage, Term of Fixed Interest Rate       2 years      
Maximum              
Loan principal, increase due to negative amortization, as a percentage of original loan amount       115.00%      
Adjustable Rate Mortgage, Term of Fixed Interest Rate       5 years      
Segregated restructured loans, period of delinquency       90 days      
Maximum | Bankruptcy              
Allowance for loan losses, pooling method, period of delinquency       60 days      
Mortgage Loans on Real Estate | Subject to Negative Amortization              
Loans held for investment 9,900,000 10,200,000   $ 9,900,000   10,200,000  
Mortgage loans, Multi-family              
Loans held for investment 448,465,000 415,627,000   448,465,000   415,627,000  
Mortgage loans, Multi-family | Subject to Negative Amortization              
Loans held for investment 6,800,000 6,900,000   6,800,000   6,900,000  
Mortgage loans, Single-family              
Loans held for investment 316,595,000 324,497,000   316,595,000   324,497,000  
Held-to-maturity Securities, Transferred Security, at Carrying Value $ 6,000,000 $ 5,200,000   $ 6,000,000   $ 5,200,000  
Loans, held for investment, originated for sale, subsequently transferred 19 18   19   18  
Mortgage loans, Single-family | Subject to Negative Amortization              
Loans held for investment $ 3,000,000 $ 3,100,000   $ 3,000,000   $ 3,100,000  
Commercial Real Estate [Member]              
Loans held for investment 98,044,000 99,528,000   98,044,000   99,528,000  
Commercial Real Estate [Member] | Subject to Negative Amortization              
Loans held for investment 140,000 170,000   140,000   170,000  
Adjustable Rate Residential Mortgage              
Loans held for investment 35,800,000 64,700,000   35,800,000   64,700,000  
Special Mention [Member]              
Loans held for investment 8,221,000 $ 8,832,000   8,221,000   8,832,000  
Special Mention [Member] | Restructured loans on accrual status              
Financing Receivable, Modifications, Number of Contracts | loan   3          
Financing Receivable, Recorded Investment, Accrual Status   $ 1,300,000       1,300,000  
Special Mention [Member] | Mortgage loans, Multi-family              
Loans held for investment 3,511,000 3,974,000   3,511,000   3,974,000  
Special Mention [Member] | Mortgage loans, Single-family              
Loans held for investment 4,710,000 4,858,000   4,710,000   4,858,000  
Special Mention [Member] | Commercial Real Estate [Member]              
Loans held for investment 0 $ 0   0   0  
Substandard [Member]              
Financing Receivable, Modifications, Number of Contracts | loan   10          
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 3,300,000       3,300,000  
Loans held for investment 10,663,000 11,204,000   10,663,000   11,204,000  
Substandard [Member] | Mortgage loans, Multi-family              
Loans held for investment 651,000 849,000   651,000   849,000  
Substandard [Member] | Mortgage loans, Single-family              
Loans held for investment 9,927,000 10,259,000   9,927,000   10,259,000  
Substandard [Member] | Commercial Real Estate [Member]              
Loans held for investment 0 0   0   0  
Current [Member]              
Financing Receivable, Modifications, Recorded Investment $ 1,724,000 $ 1,900,000   $ 1,724,000   $ 1,900,000