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Residential Mortgage Securities and MSR-Related Assets (MSR Related Assets - Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2016
Term notes backed by MSR-related collateral            
Debt Securities, Available-for-sale [Line Items]            
Term notes backed by MSR related collateral $ 1,104,130 $ 1,104,130   $ 538,499    
Amortized costs 1,100,000 1,100,000   538,500    
Gross unrealized gains 5,400 $ 5,400   $ 7    
Weighted average yield   4.99% 5.32%      
Weighted average to maturity   5 years 8 months 12 days 4 years 8 months 12 days      
Corporate Loan            
Debt Securities, Available-for-sale [Line Items]            
Commitment to lend 100,000 $ 100,000       $ 130,000
Amount drawn $ 60,200 $ 60,200     $ 124,200  
Interest coupon rate 5.39% 5.39%        
Debt term   11 months        
Commitment period on undrawn amount 11 months          
Minimum | Corporate Loan            
Debt Securities, Available-for-sale [Line Items]            
Commitment fee on undrawn amount 0.25% 0.25%        
Maximum | Corporate Loan            
Debt Securities, Available-for-sale [Line Items]            
Commitment fee on undrawn amount 1.00% 1.00%