Fair Value - Schedule of Fair Value of Financial Instruments not Carried at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets not carried at fair value:
Loans	$ 16,606,862	$ 17,574,249
HTM debt securities	606,592	619,397
Carrying Value
Financial assets not carried at fair value:
Loans	16,654,011	17,574,249
HTM debt securities	589,003	606,254
Financial liabilities not carried at fair value:
Secured financing agreements, CLOs and SASB	15,780,354	17,552,979
Unsecured senior notes	2,751,666	2,158,888
Fair Value
Financial assets not carried at fair value:
Loans	16,684,966	17,483,058
HTM debt securities	563,963	581,160
Financial liabilities not carried at fair value:
Secured financing agreements, CLOs and SASB	15,726,523	17,466,172
Unsecured senior notes	$ 2,721,859	$ 2,128,835