Loans - Activity in Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	$ 99,413
Credit loss provision (reversal), net	35,017	$ 990
Credit loss allowance at the end of the period	134,430
Activity in loan portfolio
Balance at the beginning of the period	21,186,033	18,413,649
Acquisitions/originations/additional funding	500,815	3,824,520
Capitalized Interest	28,054	26,903
Basis of loans sold	(13,439)	(2,278,467)
Loan maturities/principal repayments	(460,334)	(865,952)
Discount accretion/premium amortization	15,180	16,600
Changes in fair value	8,901	(125,783)
Foreign currency translation gain (loss), net	33,120	(72,711)
Credit loss (provision) reversal, net	(35,017)	(990)
Transfer to/from other asset classifications or between segments		0
Balance at the end of the period	21,263,313	18,937,769
Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	99,413
Credit loss provision (reversal), net	35,017
Credit loss allowance at the end of the period	134,430
Activity in loan portfolio
Credit loss (provision) reversal, net	(35,017)
Unfunded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	9,873
Credit loss provision (reversal), net	1,119
Credit loss allowance at the end of the period	10,992
Unfunded commitments	2,005,459
Activity in loan portfolio
Credit loss (provision) reversal, net	(1,119)
CMBS
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	52
Credit loss provision (reversal), net	(15)
Credit loss allowance at the end of the period	37
Unfunded commitments	33,523
Activity in loan portfolio
Credit loss (provision) reversal, net	15
Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	99,413
Credit loss allowance at the end of the period	134,430
Loans under fair value option
Activity in allowance for loan losses
Credit loss provision (reversal), net	0	0
Credit loss allowance at the end of the period	0
Activity in loan portfolio
Balance at the beginning of the period	2,784,594	2,876,800
Acquisitions/originations/additional funding	69,200	2,266,699
Capitalized Interest	0	93
Basis of loans sold	(13,439)	(2,278,467)
Loan maturities/principal repayments	(38,367)	(56,439)
Discount accretion/premium amortization	0	0
Changes in fair value	8,901	(124,520)
Foreign currency translation gain (loss), net	0	0
Credit loss (provision) reversal, net	0	0
Transfer to/from other asset classifications or between segments		346
Balance at the end of the period	2,810,889	2,684,512
Commercial Portfolio Segment
Activity in allowance for loan losses
Credit loss allowance at the end of the period	118,479
Commercial Portfolio Segment | Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	88,801
Credit loss provision (reversal), net	29,678
Credit loss allowance at the end of the period	118,479
Activity in loan portfolio
Credit loss (provision) reversal, net	(29,678)
Commercial Portfolio Segment | Loans Held-For-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	9,749
Credit loss provision (reversal), net	1,145
Credit loss allowance at the end of the period	10,894
Unfunded commitments	1,956,436
Activity in loan portfolio
Credit loss (provision) reversal, net	(1,145)
Commercial Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	88,801
Credit loss provision (reversal), net	29,678	1,379
Credit loss allowance at the end of the period	118,479
Activity in loan portfolio
Balance at the beginning of the period	16,048,507	13,450,198
Acquisitions/originations/additional funding	259,113	1,359,483
Capitalized Interest	27,924	26,697
Basis of loans sold	0	0
Loan maturities/principal repayments	(256,644)	(715,665)
Discount accretion/premium amortization	12,551	14,093
Changes in fair value	0	0
Foreign currency translation gain (loss), net	32,820	(71,909)
Credit loss (provision) reversal, net	(29,678)	(1,379)
Transfer to/from other asset classifications or between segments		0
Balance at the end of the period	16,094,593	14,061,518
Infrastructure Portfolio Segment
Activity in allowance for loan losses
Credit loss allowance at the end of the period	15,951
Infrastructure Portfolio Segment | Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	10,612
Credit loss provision (reversal), net	5,339
Credit loss allowance at the end of the period	15,951
Activity in loan portfolio
Credit loss (provision) reversal, net	(5,339)
Infrastructure Portfolio Segment | Loans Held-For-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	72
Credit loss provision (reversal), net	(11)
Credit loss allowance at the end of the period	61
Unfunded commitments	15,500
Activity in loan portfolio
Credit loss (provision) reversal, net	11
Infrastructure Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	10,612
Credit loss provision (reversal), net	5,339	(389)
Credit loss allowance at the end of the period	15,951
Activity in loan portfolio
Balance at the beginning of the period	2,352,932	2,027,426
Acquisitions/originations/additional funding	172,502	198,338
Capitalized Interest	130	113
Basis of loans sold	0	0
Loan maturities/principal repayments	(165,323)	(91,853)
Discount accretion/premium amortization	2,629	2,507
Changes in fair value	0	0
Foreign currency translation gain (loss), net	300	(802)
Credit loss (provision) reversal, net	(5,339)	389
Transfer to/from other asset classifications or between segments		0
Balance at the end of the period	2,357,831	2,136,118
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	59,225
Acquisitions/originations/additional funding	0	0
Capitalized Interest	0	0
Basis of loans sold	0	0
Loan maturities/principal repayments	0	(1,995)
Discount accretion/premium amortization	0	0
Changes in fair value	0	(1,263)
Foreign currency translation gain (loss), net	0	0
Credit loss (provision) reversal, net	0	0
Transfer to/from other asset classifications or between segments		(346)
Balance at the end of the period	$ 0	$ 55,621