Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Income taxes
Income tax expense	$ 55,568	$ 46,314
PR
Income taxes
Computed income tax at statutory rates	59,569	76,985
Net benefit of tax exempt interest income	(28,759)	(21,902)
Effect of income subject to preferential tax rate	(1,420)	(855)
Deferred tax asset valuation allowance	2,563	(4,565)
Difference in tax rates due to multiple jurisdictions	(673)	(5,169)
Tax on intercompany distributions	24,325	0
U.S., State and local taxes	1,036	3,355
Others	(1,073)	(1,535)
Income tax expense	$ 55,568	$ 46,314
% of pre-tax income
Computed income tax at statutory rates	38.00%	38.00%
Net benefit of tax exempt interest income	(18.00%)	(11.00%)
Effect of income subject to preferential tax rate	(1.00%)	0.00%
Deferred tax asset valuation allowance	1.00%	(2.00%)
Difference in tax rates due to multiple jurisdictions	0.00%	(3.00%)
Tax on intercompany distributions	16.00%	0.00%
U.S., State and local taxes	0.00%	2.00%
Others	(1.00%)	(1.00%)
Income tax expense	35.00%	23.00%

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