Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Carrying value	$ 19,627,876	$ 20,528,925
Commercial Portfolio Segment
Property, Plant and Equipment [Line Items]
Carrying value	14,552,758
Los Angeles | Mortgage Loan | Commercial Portfolio Segment
Property, Plant and Equipment [Line Items]
Carrying value	433,100
Potential foreclosure payment	70,000
Los Angeles | Mezzanine Loans | Commercial Portfolio Segment
Property, Plant and Equipment [Line Items]
Carrying value	81,600
Unfunded commitments	10,200
Loan Funding Commitments | Commercial and Residential Lending Segment
Property, Plant and Equipment [Line Items]
Value of loans with future funding commitments	1,400,000
Value of loans with future funding commitments expected to fund	1,100,000
Loan Funding Commitments | Infrastructure Lending Segment
Property, Plant and Equipment [Line Items]
Value of loans with future funding commitments	183,200
Revolvers and Letters of Credit | Infrastructure Lending Segment
Property, Plant and Equipment [Line Items]
Value of loans with future funding commitments	117,100
Debt related to properties held-for-sale	12,600
Delayed Draw Term Loans | Infrastructure Lending Segment
Property, Plant and Equipment [Line Items]
Value of loans with future funding commitments	$ 66,100