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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Interest income $ 177,662 $ 145,722 $ 534,517 $ 412,722
Interest expense (142,727) (103,754) (405,992) (314,371)
Net Interest Income 34,935 41,968 128,525 98,351
Non-interest (loss) income        
Mortgage banking activities, net 16,535 63,163 2,833 200,189
Investment fair value changes, net (57,697) 26,077 (151,789) 120,644
Other income, net 4,027 2,388 17,016 8,357
Realized gains, net 0 6,703 2,581 17,803
Total non-interest (loss) income, net (37,135) 98,331 (129,359) 346,993
General and administrative expenses (40,107) (47,692) (106,927) (131,837)
Loan acquisition costs (2,426) (4,621) (10,371) (11,928)
Other expenses (4,261) (4,023) (11,814) (12,104)
Benefit from (provision for) income taxes (1,417) 4,323 10,484 (13,907)
Net (Loss) Income (50,411) 88,286 (119,462) 275,568
Non-cash amortization (expense) income, net (10,295) (570) (14,305) (12,815)
Operating Segments | Residential Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 9,882 14,712 36,048 35,536
Interest expense (8,083) (7,537) (23,316) (19,903)
Net Interest Income 1,799 7,175 12,732 15,633
Non-interest (loss) income        
Mortgage banking activities, net 2,158 32,946 (7,694) 115,646
Investment fair value changes, net 0 0 0 0
Other income, net 0 0 0 0
Realized gains, net 0 0 0 0
Total non-interest (loss) income, net 2,158 32,946 (7,694) 115,646
General and administrative expenses (5,735) (7,891) (17,918) (27,478)
Loan acquisition costs (550) (2,395) (2,848) (5,686)
Other expenses 0 0 74 (6)
Benefit from (provision for) income taxes 1,688 (10,429) 8,283 (23,640)
Net (Loss) Income (640) 19,406 (7,371) 74,469
Non-cash amortization (expense) income, net (185) (33) (699) 8,867
Operating Segments | Business Purpose Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 9,082 3,967 22,509 9,849
Interest expense (5,971) (2,013) (12,797) (5,134)
Net Interest Income 3,111 1,954 9,712 4,715
Non-interest (loss) income        
Mortgage banking activities, net 14,377 30,217 10,527 84,543
Investment fair value changes, net 0 0 0 0
Other income, net 399 216 2,028 494
Realized gains, net 0 0 0 0
Total non-interest (loss) income, net 14,776 30,433 12,555 85,037
General and administrative expenses (18,535) (12,017) (40,076) (34,567)
Loan acquisition costs (1,876) (2,175) (7,523) (5,528)
Other expenses (3,891) (3,873) (10,731) (11,523)
Benefit from (provision for) income taxes 2,559 (3,485) 9,009 (6,988)
Net (Loss) Income (3,856) 10,837 (27,054) 31,146
Non-cash amortization (expense) income, net (3,609) (4,224) (11,563) (16,154)
Operating Segments | Investment Portfolio        
Segment Reporting Information [Line Items]        
Interest income 156,882 125,994 471,932 363,751
Interest expense (111,876) (84,049) (331,047) (258,685)
Net Interest Income 45,006 41,945 140,885 105,066
Non-interest (loss) income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net (61,780) 26,324 (165,297) 121,812
Other income, net 3,906 1,842 15,423 7,121
Realized gains, net 0 6,703 2,581 17,803
Total non-interest (loss) income, net (57,874) 34,869 (147,293) 146,736
General and administrative expenses (3,502) (4,483) (9,676) (10,804)
Loan acquisition costs 0 (51) 0 (710)
Other expenses (370) (150) (1,157) (592)
Benefit from (provision for) income taxes (5,664) (1,045) (6,808) (2,561)
Net (Loss) Income (22,404) 71,085 (24,049) 237,135
Non-cash amortization (expense) income, net (3,658) 5,682 4,385 317
Corporate/ Other        
Segment Reporting Information [Line Items]        
Interest income 1,816 1,049 4,028 3,586
Interest expense (16,797) (10,155) (38,832) (30,649)
Net Interest Income (14,981) (9,106) (34,804) (27,063)
Non-interest (loss) income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net 4,083 (247) 13,508 (1,168)
Other income, net (278) 330 (435) 742
Realized gains, net 0 0 0 0
Total non-interest (loss) income, net 3,805 83 13,073 (426)
General and administrative expenses (12,335) (23,301) (39,257) (58,988)
Loan acquisition costs 0 0 0 (4)
Other expenses 0 0 0 17
Benefit from (provision for) income taxes 0 19,282 0 19,282
Net (Loss) Income (23,511) (13,042) (60,988) (67,182)
Non-cash amortization (expense) income, net $ (2,843) $ (1,995) $ (6,428) $ (5,845)