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Residential Mortgage Securities and MSR-Related Assets (MSR Related Assets - Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 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 $ 753,594,000   $ 538,499,000  
Amortized costs 753,100,000   538,500,000  
Gross unrealized gains $ 505,230   $ 7,000  
Weighted average yield 5.44% 5.32%    
Weighted average to maturity 4 years 5 months 4 years 8 months 5 days    
Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Commitment to lend $ 100,000,000     $ 130,000,000
Amount drawn $ 71,800,000 $ 124,200,000    
Interest coupon rate 5.87%      
Debt term 1 year 5 months      
Commitment period on undrawn amount 1 year 5 months      
Minimum | Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Commitment fee on undrawn amount 0.25%      
Maximum | Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Commitment fee on undrawn amount 1.00%