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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Financial assets:
Loans and investments, net - Principal/Notional Amount	$ 3,170,117	$ 2,652,538
Loans and investments, net	3,097,689	2,579,127
Loans held-for-sale, net - Principal/Notional Amount	492,966	292,249
Securities, held-to-maturity, net - Principal/Notional Amount	70,518	40,566
Securities held-to-maturity, net	50,520	27,837
Derivative financial instruments - Principal/Notional Amount	155,202	77,984
Financial liabilities:
Credit and repurchase facilities, Principal/Notional Amount	1,172,413	530,938
Credit and repurchase facilities, Carrying value	1,169,586	528,573
Collateralized loan obligations	1,592,089	1,418,422
Debt fund	68,099	68,084
Senior unsecured notes	122,358	95,280
Convertible senior unsecured notes, net	263,653	231,287
Junior subordinated notes	140,084	139,590
Related party financing		50,000
Derivative financial instruments - Principal/Notional Amount	$ 413,694	291,421
Maximum number of days held-for-sale loans are typically sold	60 days
Carrying Value
Financial assets:
Loans and investments, net	$ 3,097,689	2,579,127
Loans held-for-sale, net	500,281	297,443
Capitalized mortgage servicing rights, net	259,401	252,608
Securities held-to-maturity, net	50,520	27,837
Derivative financial instruments	926	684
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,169,586	528,573
Collateralized loan obligations	1,592,089	1,418,422
Debt fund	68,099	68,084
Senior unsecured notes	122,358	95,280
Convertible senior unsecured notes, net	263,653	231,287
Junior subordinated notes	140,084	139,590
Related party financing		50,000
Derivative financial instruments	3,406	1,306
Fair Value
Financial assets:
Loans and investments, net	3,154,139	2,652,520
Loans held-for-sale, net	507,698	302,883
Capitalized mortgage servicing rights, net	312,316	286,073
Securities held-to-maturity, net	52,312	28,439
Derivative financial instruments	926	684
Financial liabilities:
Credit and repurchase facilities, Carrying value	1,170,235	529,992
Collateralized loan obligations	1,616,293	1,436,871
Debt fund	70,135	70,000
Senior unsecured notes	124,375	99,582
Convertible senior unsecured notes, net	289,560	254,335
Junior subordinated notes	95,458	94,215
Related party financing		49,682
Derivative financial instruments	3,406	1,306
CLOs
Financial liabilities:
Debt instrument - Principal/Notional Amount	1,609,524	1,436,274
Collateralized loan obligations	1,592,089	1,418,422
Debt Fund
Financial liabilities:
Debt instrument - Principal/Notional Amount	70,000	70,000
Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	125,000	97,860
Convertible Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	280,816	243,750
Junior subordinated notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	154,336	154,336
Junior subordinated notes	$ 140,100	$ 139,600

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