Secured borrowings (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024 USD ($) Lender	Dec. 31, 2023 USD ($) Lender
Secured borrowings and promissory note
Facility size	$ 5,074,974
Carrying Value, Secured borrowings	2,198,272	$ 2,102,075
Asset pledged as collateral without right
Secured borrowings and promissory note
Pledged Assets Carrying Value	3,317,635
Secured borrowings
Secured borrowings and promissory note
Pledged Assets Carrying Value	3,317,635	3,320,583
Borrowings under credit facilities and other financing arrangements
Secured borrowings and promissory note
Facility size	545,926
Carrying Value, Secured borrowings	200,140	149,923
Borrowings under credit facilities and other financing arrangements \| Loans and finance receivables
Secured borrowings and promissory note
Pledged Assets Carrying Value	253,165	212,512
Borrowings under credit facilities and other financing arrangements \| Asset pledged as collateral without right \| Loans and finance receivables
Secured borrowings and promissory note
Pledged Assets Carrying Value	253,165
Borrowings under repurchase agreements
Secured borrowings and promissory note
Facility size	4,529,048
Carrying Value, Secured borrowings	1,998,132	1,952,152
Borrowings under repurchase agreements \| Securities sold under agreements to repurchase
Secured borrowings and promissory note
Pledged Assets Carrying Value	3,064,470	3,108,071
Borrowings under repurchase agreements \| Asset pledged as collateral without right \| Securities sold under agreements to repurchase
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 3,064,470
SBA \| Borrowings under credit facilities and other financing arrangements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender	3
Facility size	$ 250,000
Carrying Value, Secured borrowings	$ 152,988	117,115
SBA \| Borrowings under credit facilities and other financing arrangements \| Secured Overnight Financing Rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)	2.82%
SBA \| Borrowings under credit facilities and other financing arrangements \| Prime rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)	(0.82%)
SBA \| Borrowings under credit facilities and other financing arrangements \| Asset pledged as collateral without right \| Loans and finance receivables
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 201,894
LMM Loans \| Borrowings under repurchase agreements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender	9
Facility size	$ 4,295,500
Carrying Value, Secured borrowings	$ 1,764,584	1,677,885
LMM Loans \| Borrowings under repurchase agreements \| Secured Overnight Financing Rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)	3.20%
LMM Loans \| Borrowings under repurchase agreements \| Asset pledged as collateral without right \| Securities sold under agreements to repurchase
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 2,688,517
LMM loans - USD \| Borrowings under credit facilities and other financing arrangements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender	1
Facility size	$ 80,000
Carrying Value, Secured borrowings	$ 5,686	20,729
LMM loans - USD \| Borrowings under credit facilities and other financing arrangements \| Secured Overnight Financing Rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)	1.35%
LMM loans - USD \| Borrowings under credit facilities and other financing arrangements \| Asset pledged as collateral without right \| Loans and finance receivables
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 5,770
LMM loans - Non-USD \| Borrowings under credit facilities and other financing arrangements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender	1
Facility size	$ 215,926
Carrying Value, Secured borrowings	$ 41,466	$ 12,079
LMM loans - Non-USD \| Borrowings under credit facilities and other financing arrangements \| Euribor Rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)	3.00%
LMM loans - Non-USD \| Borrowings under credit facilities and other financing arrangements \| Asset pledged as collateral without right
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 45,501
LMM loans - Non-USD \| Borrowings under repurchase agreements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender		1
Carrying Value, Secured borrowings		$ 45,031
LMM loans - Non-USD \| Borrowings under repurchase agreements \| Euribor Rate
Secured borrowings and promissory note
Pricing, spread on variable (as a percent)		3.00%
Mortgage backed securities \| Borrowings under repurchase agreements
Secured borrowings and promissory note
Number of lenders per asset class \| Lender	6
Pricing, stated rate (as a percent)	6.95%
Facility size	$ 233,548
Carrying Value, Secured borrowings	233,548	$ 229,236
Mortgage backed securities \| Borrowings under repurchase agreements \| Securities sold under agreements to repurchase
Secured borrowings and promissory note
Pledged Assets Carrying Value	20,972	$ 20,770
Mortgage backed securities \| Borrowings under repurchase agreements \| Asset pledged as collateral without right \| Securities sold under agreements to repurchase
Secured borrowings and promissory note
Pledged Assets Carrying Value	$ 375,953

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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