Loans - Activity in Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	$ 67,270
Credit loss allowance at the end of the period	68,260
Activity in loan portfolio
Balance at the beginning of the period	18,413,649	$ 12,139,908
Acquisitions/originations/additional funding	3,824,520	2,671,394
Capitalized Interest	26,903	36,646
Basis of loans sold	(2,278,467)	(571,927)
Loan maturities/principal repayments	(865,952)	(1,092,984)
Discount accretion/premium amortization	16,600	16,745
Changes in fair value	(125,783)	(9,478)
Foreign currency translation gain/(loss), net	(72,711)	(14,263)
Credit loss (provision) reversal, net	(990)	(2,597)
Transfer to/from other asset classifications or between segments	0	(7,320)
Balance at the end of the period	18,937,769	13,166,124
Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	67,270
Credit loss provision (reversal), net	990
Credit loss allowance at the end of the period	68,260
Unfunded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	6,837
Credit loss provision (reversal), net	577
Credit loss allowance at the end of the period	7,414
Unfunded commitments	2,847,164
Held-to-Maturity Preferred Interests
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	0
Credit loss provision (reversal), net	353
Credit loss allowance at the end of the period	353
Unfunded commitments	12,500
Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	67,270
Credit loss allowance at the end of the period	68,260
Loans held-for-sale
Activity in loan portfolio
Balance at the beginning of the period	2,876,800	1,052,835
Acquisitions/originations/additional funding	2,266,699	375,270
Capitalized Interest	93	0
Basis of loans sold	(2,278,467)	(571,927)
Loan maturities/principal repayments	(56,439)	(44,326)
Discount accretion/premium amortization	0	0
Changes in fair value	(124,520)	(9,188)
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	41,967
Balance at the end of the period	2,684,512	844,631
Commercial Portfolio Segment | Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	46,600
Credit loss provision (reversal), net	1,379
Credit loss allowance at the end of the period	47,979
Commercial Portfolio Segment | Loans Held-For-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	6,692
Credit loss provision (reversal), net	271
Credit loss allowance at the end of the period	6,963
Unfunded commitments	2,822,554
Commercial Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	46,600
Credit loss allowance at the end of the period	47,979
Activity in loan portfolio
Balance at the beginning of the period	13,450,198	9,583,949
Acquisitions/originations/additional funding	1,359,483	2,196,813
Capitalized Interest	26,697	36,646
Basis of loans sold	0	0
Loan maturities/principal repayments	(715,665)	(1,021,393)
Discount accretion/premium amortization	14,093	15,824
Changes in fair value	0	0
Foreign currency translation gain/(loss), net	(71,909)	(14,082)
Credit loss (provision) reversal, net	(1,379)	(1,880)
Transfer to/from other asset classifications or between segments	0	(211,904)
Balance at the end of the period	14,061,518	10,583,973
Infrastructure Portfolio Segment | Funded commitments
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	20,670
Credit loss provision (reversal), net	(389)
Credit loss allowance at the end of the period	20,281
Infrastructure Portfolio Segment | Loans Held-For-Investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	145
Credit loss provision (reversal), net	(47)
Credit loss allowance at the end of the period	98
Unfunded commitments	12,110
Infrastructure Portfolio Segment | Total loans held-for-investment
Activity in allowance for loan losses
Credit loss allowance at beginning of the period	20,670
Credit loss allowance at the end of the period	20,281
Activity in loan portfolio
Balance at the beginning of the period	2,027,426	1,412,440
Acquisitions/originations/additional funding	198,338	99,311
Capitalized Interest	113	0
Basis of loans sold	0	0
Loan maturities/principal repayments	(91,853)	(18,055)
Discount accretion/premium amortization	2,507	921
Changes in fair value	0	0
Foreign currency translation gain/(loss), net	(802)	(181)
Credit loss (provision) reversal, net	389	(717)
Transfer to/from other asset classifications or between segments	0	93,089
Balance at the end of the period	2,136,118	1,586,808
Residential Portfolio Segment | Total loans held-for-investment
Activity in loan portfolio
Balance at the beginning of the period	59,225	90,684
Acquisitions/originations/additional funding	0	0
Capitalized Interest	0	0
Basis of loans sold	0	0
Loan maturities/principal repayments	(1,995)	(9,210)
Discount accretion/premium amortization	0	0
Changes in fair value	(1,263)	(290)
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)	69,528
Balance at the end of the period	$ 55,621	$ 150,712