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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Loans and investments, net - Principal/Notional Amount	$ 4,972,138	$ 4,279,611
Loans and investments, net	4,800,176	4,189,960
Loans held-for-sale, net - Principal/Notional Amount	349,860	847,126
Loans held-for-sale, net	349,860	847,126
Securities, held-to-maturity, net - Principal/Notional Amount	168,457	111,028
Securities held-to-maturity, net	119,019	88,699
Derivative financial instruments - Principal/Notional Amount	290,081	173,532
Financial liabilities:
Credit and repurchase facilities, Principal/Notional Amount	1,240,910	1,681,146
Credit and repurchase facilities, Carrying value	1,235,613	1,678,288
Collateralized loan obligations	2,514,524	2,130,121
Senior unsecured notes	661,757	319,799
Convertible senior unsecured notes, net	265,244	284,152
Junior subordinated notes	141,295	140,949
Derivative financial instruments - Principal/Notional Amount	$ 112,458	347,701
Debt fund		68,629
Minimum
Financial liabilities:
Period of loans held for sale sold	60 days
Maximum
Financial liabilities:
Period of loans held for sale sold	180 days
Carrying Value
Financial assets:
Loans and investments, net	$ 4,800,176	4,189,960
Loans held-for-sale, net	360,372	861,360
Capitalized mortgage servicing rights, net	313,288	286,420
Securities held-to-maturity, net	119,019	88,699
Derivative financial instruments	2,214	1,435
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,235,613	1,678,288
Collateralized loan obligations	2,514,524	2,130,121
Senior unsecured notes	661,757	319,799
Convertible senior unsecured notes, net	265,244	284,152
Junior subordinated notes	141,295	140,949
Derivative financial instruments	219	3,097
Debt fund		68,629
Fair Value
Financial assets:
Loans and investments, net	4,972,258	4,228,071
Loans held-for-sale, net	366,343	876,975
Capitalized mortgage servicing rights, net	333,374	328,995
Securities held-to-maturity, net	119,881	91,738
Derivative financial instruments	2,214	1,435
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,238,062	1,677,658
Collateralized loan obligations	2,410,954	2,147,944
Senior unsecured notes	552,038	331,225
Convertible senior unsecured notes, net	253,359	310,778
Junior subordinated notes	98,628	97,668
Derivative financial instruments	219	3,097
Debt fund		70,138
CLOs
Financial liabilities:
Debt instrument - Principal/Notional Amount	2,532,593	2,147,467
Collateralized loan obligations	2,514,524	2,130,121
Debt Fund
Financial liabilities:
Debt instrument - Principal/Notional Amount		70,000
Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	670,750	325,000
Convertible Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	278,490	300,914
Junior subordinated notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	154,336	154,336
Junior subordinated notes	$ 141,300	$ 140,900

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