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Reconciliation of Reserve Balances for Insurance Claims Expenses - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
loan
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
loan
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]            
IBNR, default period (at least)     60 days      
Liability for insurance claims $ 358,000 $ 2,000 $ 358,000 $ 2,000 $ 83,000 $ 0
Primary loans in default | loan 20   20      
Prior years     $ 4,000 0    
Claims applied to deductible     18,000      
Claims paid     4,000 0    
Favorable prior year development     (79,000) 0    
Reserve for prior year insurance claims and claim expenses $ 0   $ 0      
Fannie Mae            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Number of loans in pool past due 60 days or more | loan 36   36      
Risk in Force of loans in pool past due 60 days or more $ 2,400,000   $ 2,400,000      
Deductible on policy     $ 10,300,000      
Loan-to-value ratio (less than)     0.8      
Pool reserve established $ 0 $ 0 $ 0 $ 0    
Claims paid     $ 0