Loans - Variable Rate Loans Held for Investment (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Variable rate loans held-for-investment
Carrying Value	$ 16,084,448
Weighted-average Spread Above Index	3.90%
Commercial loans
Variable rate loans held-for-investment
Carrying Value	$ 13,698,698
Weighted-average Spread Above Index	3.90%
Infrastructure loans
Variable rate loans held-for-investment
Carrying Value	$ 2,385,750
Weighted-average Spread Above Index	4.00%