Loans - Variable Rate Loans Held for Investment (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Variable rate loans held-for-investment
Carrying Value	$ 15,238,959
Weighted-average Spread Above Index	4.10%
Commercial loans
Variable rate loans held-for-investment
Carrying Value	$ 13,190,863
Weighted-average Spread Above Index	4.10%
Infrastructure loans
Variable rate loans held-for-investment
Carrying Value	$ 2,048,096
Weighted-average Spread Above Index	3.80%