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Investment Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Investment Securities      
Investment securities $ 678,287   $ 736,658
Credit Loss Allowance 5,387   5,675
Purchases   $ 5,729  
Sales   7,940  
Principal collections 59,514 13,559  
VIE eliminations      
Investment Securities      
Purchases (27,333) (36,953)  
Sales (11,604) (24,376)  
Principal collections (14,481) (24,723)  
Before consolidation of securitization VIEs      
Investment Securities      
Investment securities $ 2,110,919   2,162,228
Available-for-sale | One-month LIBOR      
Investment Securities      
Effective variable rate basis (as a percent) 0.111%    
Fair value option      
Investment Securities      
Fair Value $ 1,500    
Fair value option | VIE eliminations      
Investment Securities      
Investment securities (1,432,632)   (1,425,570)
Held-to-maturity      
Investment Securities      
Credit Loss Allowance 5,387   5,675
Purchases   5,729  
Principal collections 51,690 6,638  
Held-to-maturity | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 488,075   538,605
RMBS      
Investment Securities      
Portion of securities with variable rate 139,400    
RMBS | Available-for-sale      
Investment Securities      
Principal collections 7,251 6,549  
Purchase Amortized Cost 118,647   123,292
Recorded Amortized Cost 118,647   123,292
Gross Unrealized Gains 41,688   44,123
Gross Unrealized Losses (34)   (66)
Net Fair Value Adjustment 41,654   44,057
Fair Value $ 160,301   167,349
Portion of securities with variable rate (as a percent) 87.00%    
Cost of third party management $ 300 400  
RMBS | Available-for-sale | B-      
Investment Securities      
Weighted Average Coupon (as a percent) 1.20%    
WAL (Years) 5 years 10 months 24 days    
RMBS | Available-for-sale | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities $ 160,301   167,349
RMBS | Fair value option      
Investment Securities      
Purchases 27,333 29,292  
Principal collections 13,344 8,572  
Portion of securities with variable rate 0    
RMBS | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 249,005   235,997
CMBS | Fair value option      
Investment Securities      
Purchases   7,661  
Sales 11,604 32,316  
Principal collections 1,710 $ 16,523  
Portion of securities with variable rate 96,900    
CMBS | Fair value option | Non-Controlling Interests      
Investment Securities      
Investment securities 180,900   179,500
CMBS | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 1,202,883   1,209,030
Equity security | Fair value option | Before consolidation of securitization VIEs      
Investment Securities      
Investment securities 10,655   11,247
Infrastructure bonds      
Investment Securities      
Credit Loss Allowance $ 2,925   $ 2,926