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Fair Value - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial assets:
Loans and investments, net	$ 13,430,985	$ 14,254,674
Loans held-for-sale, net	468,738	368,066
Securities held-to-maturity, net	153,888	156,547
Financial liabilities:
Credit and repurchase facilities	3,650,876	3,841,814
Securitized debt	7,508,472	7,849,270
Senior unsecured notes	1,409,899	1,385,994
Convertible senior unsecured notes	281,046	280,356
Junior subordinated notes	143,322	143,128
Level 1
Financial liabilities:
Senior unsecured notes	1,257,377
Level 2
Financial assets:
Loans held-for-sale, net	476,339
Financial liabilities:
Credit and repurchase facilities	421,985
Convertible senior unsecured notes	264,141
Level 3
Financial assets:
Loans and investments, net	13,634,147
Loans held-for-sale, net	7,388
Capitalized mortgage servicing rights, net	502,282
Securities held-to-maturity, net	140,963
Financial liabilities:
Credit and repurchase facilities	3,188,896
Securitized debt	7,326,912
Junior subordinated notes	104,595
Carrying Value
Financial assets:
Loans and investments, net	13,430,985	14,254,674
Loans held-for-sale, net	469,602	354,070
Capitalized mortgage servicing rights, net	396,634
Securities held-to-maturity, net	153,888	156,547
Financial liabilities:
Credit and repurchase facilities	3,650,876	3,841,814
Securitized debt	7,508,472	7,849,270
Senior unsecured notes	1,409,899	1,385,994
Convertible senior unsecured notes	281,046	280,356
Junior subordinated notes	143,322	143,128
Fair Value
Financial assets:
Loans and investments, net	13,634,147	14,468,418
Loans held-for-sale, net	483,727	362,054
Capitalized mortgage servicing rights, net	502,282
Securities held-to-maturity, net	140,963	144,571
Financial liabilities:
Credit and repurchase facilities	3,610,881	3,828,192
Securitized debt	7,326,912	7,560,541
Senior unsecured notes	1,257,377	1,262,560
Convertible senior unsecured notes	264,141	287,834
Junior subordinated notes	$ 104,595	$ 103,977

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