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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financial assets:
Loans and investments, net - Principal/Notional Amount	$ 4,279,611	$ 3,283,342
Loans and investments, net	4,189,960	3,200,145
Loans held-for-sale, net - Principal/Notional Amount	847,126	472,964
Loans held-for-sale, net	847,126	472,964
Securities, held-to-maturity, net - Principal/Notional Amount	111,028	103,515
Securities held-to-maturity, net	88,699	76,363
Derivative financial instruments - Principal/Notional Amount	173,532	400,661
Financial liabilities:
Credit and repurchase facilities, Principal/Notional Amount	1,681,146	1,138,135
Credit and repurchase facilities, Carrying value	1,678,288	1,135,627
Collateralized loan obligations	2,130,121	1,593,548
Debt fund	68,629	68,183
Senior unsecured notes	319,799	122,484
Convertible senior unsecured notes, net	284,152	254,768
Junior subordinated notes	140,949	140,259
Derivative financial instruments - Principal/Notional Amount	$ 347,701	108,625
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	$ 4,189,960	3,200,145
Loans held-for-sale, net	861,360	481,664
Capitalized mortgage servicing rights, net	286,420	273,770
Securities held-to-maturity, net	88,699	76,363
Derivative financial instruments	1,435	6,113
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,678,288	1,135,627
Collateralized loan obligations	2,130,121	1,593,548
Debt fund	68,629	68,183
Senior unsecured notes	319,799	122,484
Convertible senior unsecured notes, net	284,152	254,768
Junior subordinated notes	140,949	140,259
Derivative financial instruments	3,097	732
Fair Value
Financial assets:
Loans and investments, net	4,228,071	3,249,499
Loans held-for-sale, net	876,975	489,546
Capitalized mortgage servicing rights, net	328,995	322,463
Securities held-to-maturity, net	91,738	79,097
Derivative financial instruments	1,435	6,113
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,677,658	1,135,774
Collateralized loan obligations	2,147,944	1,588,989
Debt fund	70,138	70,154
Senior unsecured notes	331,225	123,750
Convertible senior unsecured notes, net	310,778	267,324
Junior subordinated notes	97,668	95,873
Derivative financial instruments	3,097	732
CLOs
Financial liabilities:
Debt instrument - Principal/Notional Amount	2,147,467	1,609,524
Collateralized loan obligations	2,130,121	1,593,548
Debt Fund
Financial liabilities:
Debt instrument - Principal/Notional Amount	70,000
Debt fund		70,000
Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	325,000	125,000
Convertible Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	300,914	270,057
Convertible senior unsecured notes, net		270,057
Junior subordinated notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	154,336	154,336
Junior subordinated notes	$ 140,900	$ 140,300

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