Loans - Activity in Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	$ 309,039
Credit loss provision (reversal), net	24,153	$ 35,017
Credit loss allowance at the end of the period	331,646
Activity in loan portfolio
Balance at the beginning of the period	20,219,886	21,186,033
Acquisitions/originations/additional funding	554,693	500,815
Capitalized interest	20,418	28,054
Basis of loans sold	(218,597)	(13,439)
Loan maturities/principal repayments	(1,147,302)	(460,334)
Discount accretion/premium amortization	19,891	15,180
Changes in fair value	(29,013)	8,901
Foreign currency translation loss, net	(99,593)	33,120
Credit loss provision, net	(24,153)	(35,017)
Transfer to/from other asset classifications or between segments	0
Balance at the end of the period	19,296,230	21,263,313
Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	309,039
Credit loss provision (reversal), net	22,607
Credit loss allowance at the end of the period	331,646
Activity in loan portfolio
Credit loss provision, net	(22,607)
Unfunded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	10,928
Credit loss provision (reversal), net	7,240
Credit loss allowance at the end of the period	18,168
Unfunded commitments	1,163,872
Activity in loan portfolio
Credit loss provision, net	(7,240)
HTM Preferred Intrests
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	1,548
Credit loss provision (reversal), net	6,645
Credit loss allowance at the end of the period	8,193
Unfunded commitments	30,686
Activity in loan portfolio
Credit loss provision, net	(6,645)
CMBS
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	74
Credit loss provision (reversal), net	1
Credit loss allowance at the end of the period	75
Unfunded commitments	31,916
Activity in loan portfolio
Credit loss provision, net	(1)
Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	309,039
Credit loss allowance at the end of the period	331,646
Loans under fair value option
Activity in allowance for loan losses
Credit loss provision (reversal), net	1,546	0
Credit loss allowance at the end of the period	0
Activity in loan portfolio
Balance at the beginning of the period	2,645,637	2,784,594
Acquisitions/originations/additional funding	289,508	69,200
Capitalized interest	0	0
Basis of loans sold	(218,597)	(13,439)
Loan maturities/principal repayments	(45,316)	(38,367)
Discount accretion/premium amortization	0	0
Changes in fair value	(29,013)	8,901
Foreign currency translation loss, net	0	0
Credit loss provision, net	(1,546)	0
Transfer to/from other asset classifications or between segments	48,695
Balance at the end of the period	2,689,368	2,810,889
Commercial Portfolio Segment
Activity in allowance for loan losses
Credit loss allowance at the end of the period	322,087
Commercial Portfolio Segment | Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	298,775
Credit loss provision (reversal), net	23,312
Credit loss allowance at the end of the period	322,087
Activity in loan portfolio
Credit loss provision, net	(23,312)
Commercial Portfolio Segment | Loans Held-for-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	8,742
Credit loss provision (reversal), net	571
Credit loss allowance at the end of the period	9,313
Unfunded commitments	1,035,180
Activity in loan portfolio
Credit loss provision, net	(571)
Commercial Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	298,775
Credit loss provision (reversal), net	23,312	29,678
Credit loss allowance at the end of the period	322,087
Activity in loan portfolio
Balance at the beginning of the period	15,078,589	16,048,507
Acquisitions/originations/additional funding	131,886	259,113
Capitalized interest	20,418	27,924
Basis of loans sold	0	0
Loan maturities/principal repayments	(892,855)	(256,644)
Discount accretion/premium amortization	15,090	12,551
Changes in fair value	0	0
Foreign currency translation loss, net	(99,145)	32,820
Credit loss provision, net	(23,312)	(29,678)
Transfer to/from other asset classifications or between segments	0
Balance at the end of the period	14,230,671	16,094,593
Infrastructure Portfolio Segment
Activity in allowance for loan losses
Credit loss allowance at the end of the period	9,559
Infrastructure Portfolio Segment | Funded Commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	10,264
Credit loss provision (reversal), net	(705)
Credit loss allowance at the end of the period	9,559
Activity in loan portfolio
Credit loss provision, net	705
Infrastructure Portfolio Segment | Loans Held-for-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	564
Credit loss provision (reversal), net	23
Credit loss allowance at the end of the period	587
Unfunded commitments	66,090
Activity in loan portfolio
Credit loss provision, net	(23)
Infrastructure Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	10,264
Credit loss provision (reversal), net	(705)	5,339
Credit loss allowance at the end of the period	9,559
Activity in loan portfolio
Balance at the beginning of the period	2,495,660	2,352,932
Acquisitions/originations/additional funding	133,299	172,502
Capitalized interest	0	130
Basis of loans sold	0	0
Loan maturities/principal repayments	(209,131)	(165,323)
Discount accretion/premium amortization	4,801	2,629
Changes in fair value	0	0
Foreign currency translation loss, net	(448)	300
Credit loss provision, net	705	(5,339)
Transfer to/from other asset classifications or between segments	(48,695)
Balance at the end of the period	2,376,191	2,357,831
Residential Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss provision (reversal), net	0	0
Activity in loan portfolio
Balance at the beginning of the period	0	0
Acquisitions/originations/additional funding	0	0
Capitalized interest	0	0
Basis of loans sold	0	0
Loan maturities/principal repayments	0	0
Discount accretion/premium amortization	0	0
Changes in fair value	0	0
Foreign currency translation loss, net	0	0
Credit loss provision, net	0	0
Transfer to/from other asset classifications or between segments	0
Balance at the end of the period	$ 0	$ 0