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Residential Mortgage Securities and MSR Related Assets (MSR-Related Assets - Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
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 $ 1,157,463 $ 538,499    
Amortized costs 1,200,000 538,500    
Gross unrealized gains $ 5,200 $ 7    
Weighted average yield 4.75% 5.32%    
Weighted average to maturity 5 years 3 months 18 days 4 years 8 months 12 days    
Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Commitment to lend   $ 100,000   $ 130,000
Amount drawn $ 59,500   $ 124,200  
Interest coupon rate 5.14%      
Remaining term 8 months      
Commitment period on undrawn amount 8 months      
Minimum | Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Financing Receivable, Commitment Fee Income Rate 0.25%      
Maximum | Corporate Loan        
Debt Securities, Available-for-sale [Line Items]        
Financing Receivable, Commitment Fee Income Rate 1.00%