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Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Interest income $ 724,462 $ 707,854 $ 574,926
Interest expense (631,519) (552,400) (426,749)
Net Interest Income 92,943 155,454 148,177
Non-interest income (loss)      
Mortgage banking activities, net 67,386 (13,659) 235,744
Investment fair value changes, net (44,400) (178,272) 114,624
HEI income, net 35,117 2,714 13,425
Other income, net 12,886 21,204 12,018
Realized gains, net 1,699 5,334 17,993
Total non-interest income (loss), net 72,688 (162,679) 393,804
General and administrative expenses (128,295) (140,908) (165,218)
Portfolio management costs (14,571) (7,951) (5,758)
Loan acquisition costs (7,166) (11,766) (16,219)
Other expenses (16,238) (15,590) (16,695)
Other expense     (16,695)
(Provision for) benefit from income taxes (1,635) 19,920 (18,478)
Net (Loss) Income (2,274) (163,520) 319,613
Non-cash amortization (expense) income, net (31,540) (21,928) (45,193)
Operating Segments | Residential Consumer Mortgage Banking      
Segment Reporting Information [Line Items]      
Interest income 25,404 45,202 48,953
Interest expense (24,114) (32,735) (26,963)
Net Interest Income 1,290 12,467 21,990
Non-interest income (loss)      
Mortgage banking activities, net 27,782 (21,282) 127,151
Investment fair value changes, net 1,076 0 0
HEI income, net 0 0 0
Other income, net 0 0 0
Realized gains, net 0 0 0
Total non-interest income (loss), net 28,858 (21,282) 127,151
General and administrative expenses (17,171) (22,566) (33,574)
Portfolio management costs 0 0 0
Loan acquisition costs (1,266) (3,085) (7,480)
Other expenses 0 74  
Other expense     104
(Provision for) benefit from income taxes (1,659) 12,814 (25,777)
Net (Loss) Income 10,052 (21,578) 82,414
Non-cash amortization (expense) income, net (1,097) (1,075) (82)
Operating Segments | Residential Investor Mortgage Banking      
Segment Reporting Information [Line Items]      
Interest income 15,896 28,674 14,054
Interest expense (13,078) (18,041) (7,230)
Net Interest Income 2,818 10,633 6,824
Non-interest income (loss)      
Mortgage banking activities, net 39,604 7,623 108,593
Investment fair value changes, net 0 0 0
HEI income, net 0 0 0
Other income, net 5,613 3,509 1,046
Realized gains, net 0 0 0
Total non-interest income (loss), net 45,217 11,132 109,639
General and administrative expenses (44,547) (56,557) (46,586)
Portfolio management costs 0 0 0
Loan acquisition costs (5,900) (8,681) (8,100)
Other expenses (12,442) (13,969)  
Other expense     (15,127)
(Provision for) benefit from income taxes 2,279 13,157 (8,122)
Net (Loss) Income (12,575) (44,285) 38,528
Non-cash amortization (expense) income, net (13,610) (15,071) (16,452)
Operating Segments | Investment Portfolio      
Segment Reporting Information [Line Items]      
Interest income 665,152 627,134 507,173
Interest expense (526,547) (445,154) (351,635)
Net Interest Income 138,605 181,980 155,538
Non-interest income (loss)      
Mortgage banking activities, net 0 0 0
Investment fair value changes, net (42,322) (193,862) 116,189
HEI income, net 35,117 2,714 13,425
Other income, net 10,361 18,596 10,021
Realized gains, net 858 3,174 17,993
Total non-interest income (loss), net 4,014 (169,378) 157,628
General and administrative expenses (5,638) (6,036) (7,992)
Portfolio management costs (14,516) (7,951) (5,758)
Loan acquisition costs 0 0 (635)
Other expenses (5,796) (1,695)  
Other expense     (1,689)
(Provision for) benefit from income taxes (2,946) (6,051) (3,862)
Net (Loss) Income 113,723 (9,131) 293,230
Non-cash amortization (expense) income, net (8,657) 2,507 (20,781)
Corporate/ Other      
Segment Reporting Information [Line Items]      
Interest income 18,010 6,844 4,746
Interest expense (67,780) (56,470) (40,921)
Net Interest Income (49,770) (49,626) (36,175)
Non-interest income (loss)      
Mortgage banking activities, net 0 0 0
Investment fair value changes, net (3,154) 15,590 (1,565)
HEI income, net 0 0 0
Other income, net (3,088) (901) 951
Realized gains, net 841 2,160 0
Total non-interest income (loss), net (5,401) 16,849 (614)
General and administrative expenses (60,939) (55,749) (77,066)
Portfolio management costs (55) 0 0
Loan acquisition costs 0 0 (4)
Other expenses 2,000 0 17
Other expense     17
(Provision for) benefit from income taxes 691 0 19,283
Net (Loss) Income (113,474) (88,526) (94,559)
Non-cash amortization (expense) income, net $ (8,176) $ (8,289) $ (7,878)