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Fair Value - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Loans and investments, net	$ 12,377,806	$ 14,254,674	$ 11,981,048	$ 5,285,868
Loans held-for-sale, net	552,325	368,066
Securities held-to-maturity, net	155,279	156,547
Financial liabilities:
Credit and repurchase facilities	3,237,827	3,841,814
Securitized debt	6,935,010	7,849,270
Senior unsecured notes	1,333,968	1,385,994
Convertible senior unsecured notes, net	283,118	280,356
Junior subordinated notes	143,896	143,128
Level 1
Financial assets:
Loans and investments, net	0
Loans held-for-sale, net	0
Capitalized mortgage servicing rights, net	0
Securities held-to-maturity, net	0
Financial liabilities:
Credit and repurchase facilities	0
Securitized debt	0
Senior unsecured notes	1,214,331
Convertible senior unsecured notes, net	0
Junior subordinated notes	0
Level 2
Financial assets:
Loans and investments, net	0
Loans held-for-sale, net	558,667
Capitalized mortgage servicing rights, net	0
Securities held-to-maturity, net	0
Financial liabilities:
Credit and repurchase facilities	413,326
Securitized debt	0
Senior unsecured notes	0
Convertible senior unsecured notes, net	301,156
Junior subordinated notes	0
Level 3
Financial assets:
Loans and investments, net	12,452,563
Loans held-for-sale, net	7,784
Capitalized mortgage servicing rights, net	510,472
Securities held-to-maturity, net	129,390
Financial liabilities:
Credit and repurchase facilities	2,814,998
Securitized debt	6,864,557
Senior unsecured notes	0
Convertible senior unsecured notes, net	0
Junior subordinated notes	106,444
Carrying Value
Financial assets:
Loans and investments, net	12,377,806	14,254,674
Loans held-for-sale, net	551,707	354,070
Capitalized mortgage servicing rights, net	391,254
Securities held-to-maturity, net	155,279	156,547
Financial liabilities:
Credit and repurchase facilities	3,237,827	3,841,814
Securitized debt	6,935,010	7,849,270
Senior unsecured notes	1,333,968	1,385,994
Convertible senior unsecured notes, net	283,118	280,356
Junior subordinated notes	143,896	143,128
Fair Value
Financial assets:
Loans and investments, net	12,452,563	14,468,418
Loans held-for-sale, net	566,451	362,054
Capitalized mortgage servicing rights, net	510,472
Securities held-to-maturity, net	129,390	144,571
Financial liabilities:
Credit and repurchase facilities	3,228,324	3,828,192
Securitized debt	6,864,557	7,560,541
Senior unsecured notes	1,214,331	1,262,560
Convertible senior unsecured notes, net	301,156	287,834
Junior subordinated notes	$ 106,444	$ 103,977

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