Loans - Variable Rate Loans Held for Investment (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Variable rate loans held-for-investment
Carrying Value	$ 16,813,983
Weighted-average Spread Above Index	4.00%
Commercial loans
Variable rate loans held-for-investment
Carrying Value	$ 14,532,060
Weighted-average Spread Above Index	4.00%
Infrastructure loans
Variable rate loans held-for-investment
Carrying Value	$ 2,281,923
Weighted-average Spread Above Index	4.10%