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Investment Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Investment Securities      
Investment securities $ 777,972   $ 810,238
Credit Loss Allowance 5,037    
Purchases 5,729    
Sales 7,940 $ 3,228  
Principal collections 13,559 7,754  
VIE eliminations      
Investment Securities      
Purchases (36,953) (39,534)  
Sales (24,376) (33,678)  
Principal collections (24,723) (11,683)  
Before consolidation of securitization VIEs      
Investment Securities      
Investment securities $ 2,095,745   $ 2,215,275
Available-for-sale | One-month LIBOR      
Investment Securities      
Effective variable rate basis (as a percent) 0.993%   1.763%
Fair value option      
Investment Securities      
Fair Value $ 1,400    
Fair value option | VIE eliminations      
Investment Securities      
Investment securities (1,317,773)   $ (1,405,037)
Held-to-maturity      
Investment Securities      
Credit Loss Allowance 5,037   0
Purchases 5,729    
Principal collections 6,638 1,206  
Held-to-maturity | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 565,851   570,638
RMBS      
Investment Securities      
Portion of securities with variable rate 144,500    
RMBS | Available-for-sale      
Investment Securities      
Principal collections 6,549 6,360  
Purchase Amortized Cost 134,692   138,580
Recorded Amortized Cost 134,692   138,580
Gross Unrealized Gains 36,514   51,310
Gross Unrealized Losses (566)   (314)
Net Fair Value Adjustment 35,948   50,996
Fair Value $ 170,640   189,576
Portion of securities with variable rate     $ 160,900
Portion of securities with variable rate (as a percent) 84.70%   84.90%
Cost of third party management     $ 400
RMBS | Available-for-sale | LIBOR      
Investment Securities      
Variable rate, weighted average spread (as a percent) 1.25%   1.24%
RMBS | Available-for-sale | B-      
Investment Securities      
Weighted Average Coupon (as a percent) 2.40%   3.10%
WAL (Years) 5 years 9 months 18 days   5 years 7 months 6 days
RMBS | Available-for-sale | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities $ 170,640   $ 189,576
RMBS | Fair value option      
Investment Securities      
Purchases 29,292 26,272  
Principal collections 8,572 2,034  
Portion of securities with variable rate 0    
RMBS | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 149,914   147,034
CMBS | Fair value option      
Investment Securities      
Purchases 7,661 13,262  
Sales 32,316 36,906  
Principal collections 16,523 $ 9,837  
Portion of securities with variable rate 104,700    
CMBS | Fair value option | Non-Controlling Interests      
Investment Securities      
Investment securities 170,100   186,600
CMBS | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 1,200,714   1,295,363
Equity security | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 8,626   $ 12,664
Infrastructure bonds      
Investment Securities      
Credit Loss Allowance $ 3,019