Loans - Variable Rate Loans Held for Investment (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Variable rate loans held-for-investment
Carrying Value	$ 17,887,530
Weighted-average Spread Above Index	4.00%
Commercial loans
Variable rate loans held-for-investment
Carrying Value	$ 15,526,655
Weighted-average Spread Above Index	4.00%
Infrastructure loans
Variable rate loans held-for-investment
Carrying Value	$ 2,360,875
Weighted-average Spread Above Index	4.00%