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Reserves for Insurance Claims and Claim Expenses - Narrative (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
loan
claim
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]        
IBNR, default period (at least) 60 days      
Total gross liability for unpaid claims and claim adjustment expenses $ 18,432 $ 10,601 $ 12,811 $ 8,761
Primary loans in default | loan 1,028      
Number of claims paid | claim 62      
Claims paid, including amounts covered by insurance $ 1,700      
Favorable prior year development 1,735 $ 940    
Reserve for prior year insurance claims and claim expenses $ 8,900      
Fannie Mae        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Number of loans in pool past due 60 days or more | loan 54      
Risk-in-Force of loans in pool past due 60 days or more $ 3,400      
Loan-to-value ratio (less than) 0.80      
Claims applied to pool deductible $ 700      
Deductible on policy $ 9,600      
QSR Transactions        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Number of covered claims included in number of claims paid | claim 58      
Component of claims paid covered under QSR Transaction $ 300      
2016 QSR Transaction | Fannie Mae        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Percent of pool RIF reinsured 100.00%