Loans - Variable Rate Loans Held for Investment (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Variable rate loans held-for-investment
Carrying Value	$ 15,542,927
Weighted-average Spread Above Index	4.00%
Commercial loans
Variable rate loans held-for-investment
Carrying Value	$ 13,419,816
Weighted-average Spread Above Index	4.00%
Infrastructure loans
Variable rate loans held-for-investment
Carrying Value	$ 2,123,111
Weighted-average Spread Above Index	3.90%