Fair Value - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Financial assets:
Loans and investments, net - Principal/Notional Amount	$ 14,989,643	$ 12,158,995
Loans and investments, net	14,791,426	11,981,048
Loans held-for-sale, net - Principal/Notional Amount	552,306	1,077,239
Loans held-for-sale, net	552,306	1,077,239
Securities, held-to-maturity, net - Principal/Notional Amount	236,712	210,728
Securities held-to-maturity, net	157,818	140,484
Derivative financial instruments - Principal/Notional Amount	187,082	280,654
Financial liabilities:
Credit and repurchase facilities, Principal/Notional Amount	4,642,911	4,493,699
Debt Carrying Value	4,633,132	4,481,579
Collateralized loan obligations	7,971,996	5,892,810
Senior unsecured notes	1,283,527	1,280,545
Convertible senior unsecured notes, net	346,040	259,385
Junior subordinated notes	142,933	142,382
Derivative financial instruments - Principal/Notional Amount	$ 464,506	301,816
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	$ 14,791,426	11,981,048
Loans held-for-sale, net	543,876	1,093,609
Capitalized mortgage servicing rights, net	403,886	422,734
Securities held-to-maturity, net	157,818	140,484
Derivative financial instruments	4,206	1,665
Financial liabilities:
Debt Carrying Value	4,633,132	4,481,579
Collateralized loan obligations	7,971,996	5,892,810
Senior unsecured notes	1,283,527	1,280,545
Convertible senior unsecured notes, net	346,040	259,385
Junior subordinated notes	142,933	142,382
Derivative financial instruments	23,239	1,482
Fair Value
Financial assets:
Loans and investments, net	14,993,875	12,181,194
Loans held-for-sale, net	554,044	1,117,085
Capitalized mortgage servicing rights, net	530,859	477,323
Securities held-to-maturity, net	150,027	149,911
Derivative financial instruments	4,206	1,665
Financial liabilities:
Debt Carrying Value	4,622,672	4,484,107
Collateralized loan obligations	7,800,210	5,914,453
Senior unsecured notes	1,165,125	1,301,708
Convertible senior unsecured notes, net	327,244	294,690
Junior subordinated notes	103,402	101,698
Derivative financial instruments	23,239	1,482
Collateralized loan obligations
Financial liabilities:
Debt instrument - Principal/Notional Amount	8,009,329	5,924,705
Collateralized loan obligations	7,971,996	5,892,810
Senior Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	1,295,750	1,295,750
Convertible Senior Unsecured Notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	353,608	264,000
Junior subordinated notes
Financial liabilities:
Debt instrument - Principal/Notional Amount	154,336	154,336
Junior subordinated notes	$ 142,900	$ 142,400

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