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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Securities, Available-for-sale [Line Items]        
Proceeds $ 258,613,000 $ 494,704,000 $ 685,509,000 $ 787,652,000
Available-for-sale Securities, Gross Realized Gains 4,976,000 8,464,000 13,468,000 16,511,000
Available-for-sale Securities, Gross Realized Losses 21,766,000 10,416,000 35,197,000 11,997,000
Available-for-sale Securities, Gross Realized Gain (Loss) (16,790,000) (1,952,000) (21,729,000) 4,514,000
Available-for-sale securities Realizes Losses - adjustments to cost basis of certain securities (1,000,000.0) (82,000) (2,500,000) (1,300,000)
Agency RMBS        
Securities, Available-for-sale [Line Items]        
Proceeds 174,796,000 417,359,000 566,721,000 492,218,000
Available-for-sale Securities, Gross Realized Gains 26,000 2,997,000 1,207,000 3,378,000
Available-for-sale Securities, Gross Realized Losses 21,549,000 6,930,000 34,027,000 7,291,000
Available-for-sale Securities, Gross Realized Gain (Loss) (21,523,000) (3,933,000) (32,820,000) (3,913,000)
Non-Agency RMBS and CMBS        
Securities, Available-for-sale [Line Items]        
Proceeds 1,086,000 18,544,000 7,594,000 141,752,000
Available-for-sale Securities, Gross Realized Gains 2,395,000 2,900,000 4,336,000 9,139,000
Available-for-sale Securities, Gross Realized Losses 3,000 152,000 26,000 1,147,000
Available-for-sale Securities, Gross Realized Gain (Loss) 2,392,000 2,748,000 4,310,000 7,992,000
CLOs        
Securities, Available-for-sale [Line Items]        
Proceeds 2,835,000 43,426,000 17,267,000 129,001,000
Available-for-sale Securities, Gross Realized Gains 2,358,000 2,320,000 4,260,000 3,491,000
Available-for-sale Securities, Gross Realized Losses 70,000 3,250,000 690,000 3,429,000
Available-for-sale Securities, Gross Realized Gain (Loss) 2,288,000 (930,000) 3,570,000 62,000
Other Securities        
Securities, Available-for-sale [Line Items]        
Proceeds 79,896,000 15,375,000 93,927,000 24,681,000
Available-for-sale Securities, Gross Realized Gains 197,000 247,000 3,665,000 503,000
Available-for-sale Securities, Gross Realized Losses 144,000 84,000 454,000 130,000
Available-for-sale Securities, Gross Realized Gain (Loss) $ 53,000 $ 163,000 $ 3,211,000 $ 373,000