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Fair Value, Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial assets:
Loans and investments, net	$ 11,981,048	$ 5,285,868	$ 4,189,960	$ 3,200,145
Loans held-for-sale, net	1,077,239	968,595
Securities held-to-maturity, net	140,484	95,524
Financial liabilities:
Credit and repurchase facilities, Carrying value	4,481,579	2,234,883
Collateralized loan obligations	5,892,810	2,517,309
Senior unsecured notes	1,280,545	662,843
Convertible senior unsecured notes, net	259,385	267,973
Junior subordinated notes	142,382	141,656
Level 1
Financial liabilities:
Senior unsecured notes	1,301,708
Level 2
Financial assets:
Loans held-for-sale, net	1,097,699
Financial liabilities:
Credit and repurchase facilities, Carrying value	956,272
Convertible senior unsecured notes, net	294,690
Level 3
Financial assets:
Loans and investments, net	12,181,194
Loans held-for-sale, net	19,386
Capitalized mortgage servicing rights, net	477,323
Securities held-to-maturity, net	149,911
Financial liabilities:
Credit and repurchase facilities, Carrying value	3,527,835
Collateralized loan obligations	5,914,453
Junior subordinated notes	101,698
Carrying Value
Financial assets:
Loans and investments, net	11,981,048	5,285,868
Loans held-for-sale, net	1,093,609	986,919
Capitalized mortgage servicing rights, net	422,734
Securities held-to-maturity, net	140,484	95,524
Financial liabilities:
Credit and repurchase facilities, Carrying value	4,481,579	2,234,883
Collateralized loan obligations	5,892,810	2,517,309
Senior unsecured notes	1,280,545	662,843
Convertible senior unsecured notes, net	259,385	267,973
Junior subordinated notes	142,382	141,656
Estimated Fair Value Disclosure
Financial assets:
Loans and investments, net	12,181,194	5,428,141
Loans held-for-sale, net	1,117,085	1,007,294
Capitalized mortgage servicing rights, net	477,323
Securities held-to-maturity, net	149,911	94,128
Financial liabilities:
Credit and repurchase facilities, Carrying value	4,484,107	2,235,668
Collateralized loan obligations	5,914,453	2,495,195
Senior unsecured notes	1,301,708	670,117
Convertible senior unsecured notes, net	294,690	280,636
Junior subordinated notes	$ 101,698	$ 99,594

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