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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Securities, Available-for-sale [Line Items]    
Proceeds $ 506,748,000 $ 430,496,000
Available-for-sale Securities, Gross Realized Gains 2,289,000 8,614,000
Available-for-sale Securities, Gross Realized Losses 28,100,000 13,473,000
Available-for-sale Securities, Gross Realized Gain (Loss) (25,811,000) (4,859,000)
Available-for-sale securities Realizes Losses - adjustments to cost basis of certain securities (5,700,000) (1,600,000)
Agency RMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 205,504,000 391,924,000
Available-for-sale Securities, Gross Realized Gains 796,000 1,203,000
Available-for-sale Securities, Gross Realized Losses 26,336,000 12,500,000
Available-for-sale Securities, Gross Realized Gain (Loss) (25,540,000) (11,297,000)
Non-Agency RMBS and CMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 27,188,000 6,509,000
Available-for-sale Securities, Gross Realized Gains 1,084,000 1,957,000
Available-for-sale Securities, Gross Realized Losses 15,000 39,000
Available-for-sale Securities, Gross Realized Gain (Loss) 1,069,000 1,918,000
CLOs    
Securities, Available-for-sale [Line Items]    
Proceeds 0 16,366,000
Available-for-sale Securities, Gross Realized Gains 89,000 1,981,000
Available-for-sale Securities, Gross Realized Losses 0 619,000
Available-for-sale Securities, Gross Realized Gain (Loss) 89,000 1,362,000
Other Securities    
Securities, Available-for-sale [Line Items]    
Proceeds 274,056,000 15,697,000
Available-for-sale Securities, Gross Realized Gains 320,000 3,473,000
Available-for-sale Securities, Gross Realized Losses 1,749,000 315,000
Available-for-sale Securities, Gross Realized Gain (Loss) $ (1,429,000) $ 3,158,000