Fair Value - Financial Instruments not Carried at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial assets not carried at fair value:
Loans	$ 16,521,979	$ 15,437,013
HTM debt securities	393,909	431,424
Carrying Value
Financial assets not carried at fair value:
Loans	16,521,979	15,437,013
HTM debt securities	370,419	406,961
Financial liabilities not carried at fair value:
Secured financing agreements, CLOs and SASB	15,603,734	14,347,983
Unsecured senior notes	2,747,330	2,994,682
Fair Value
Financial assets not carried at fair value:
Loans	16,659,443	15,546,013
HTM debt securities	345,386	382,394
Financial liabilities not carried at fair value:
Secured financing agreements, CLOs and SASB	15,677,520	14,406,533
Unsecured senior notes	$ 2,769,695	$ 3,017,102