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Segment Information - Components of Corporate/Other (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Interest income $ 192,581 $ 150,117 $ 148,542 $ 131,041 $ 119,725 $ 99,397 $ 82,976 $ 76,619 $ 622,281 $ 378,717 $ 248,057
Interest expense (147,708) (116,604) (116,220) (99,276) (84,961) (64,351) (48,213) (41,514) (479,808) (239,039) (108,816)
Net Interest Income 44,873 33,513 32,322 31,765 34,764 35,046 34,763 35,105 142,473 139,678 139,241
Investment fair value changes, net                 35,500 (25,689) 10,374
Other income                 1,799 0 0
Realized gains, net                 23,821 27,041 13,355
Total non-interest income, net 58,052 30,029 29,984 47,779 (17,538) 32,327 19,527 39,672 165,844 73,988 90,073
General and administrative expenses                 (118,672) (82,782) (77,156)
Other expenses                 (13,022) (196) 0
Net Income $ 49,143 $ 34,310 $ 31,266 $ 54,464 $ (913) $ 40,921 $ 32,747 $ 46,845 169,183 119,600 140,406
Legacy Consolidated VIEs                      
Segment Reporting Information [Line Items]                      
Other expenses                 0 0 0
Other                      
Segment Reporting Information [Line Items]                      
Other expenses                 (3,395) (178) 0
Corporate/ Other                      
Segment Reporting Information [Line Items]                      
Interest income                 17,649 20,036 19,407
Interest expense                 (14,418) (16,519) (14,833)
Net Interest Income                 3,231 3,517 4,574
Investment fair value changes, net                 (1,617) (996) (8,040)
Other income                 2,711 618 0
Realized gains, net                 0 0 (752)
Total non-interest income, net                 1,094 (378) (8,792)
General and administrative expenses                 (53,005) (44,322) (46,081)
Other expenses                 (3,395) (178) 0
Net Income                 (52,075) (41,361) (50,299)
Corporate/ Other | Legacy Consolidated VIEs                      
Segment Reporting Information [Line Items]                      
Interest income                 17,649 20,036 19,407
Interest expense                 (14,418) (16,519) (14,789)
Net Interest Income                 3,231 3,517 4,618
Investment fair value changes, net                 (1,545) (1,016) (8,027)
Other income                 0 0 0
Realized gains, net                 0 0 0
Total non-interest income, net                 (1,545) (1,016) (8,027)
General and administrative expenses                 0 0 0
Net Income                 1,686 2,501 (3,409)
Corporate/ Other | Other                      
Segment Reporting Information [Line Items]                      
Interest income                 0 0 0
Interest expense                 0 0 (44)
Net Interest Income                 0 0 (44)
Investment fair value changes, net                 (72) 20 (13)
Other income                 2,711 618 0
Realized gains, net                 0 0 (752)
Total non-interest income, net                 2,639 638 (765)
General and administrative expenses                 (53,005) (44,322) (46,081)
Net Income                 $ (53,761) $ (43,862) $ (46,890)