Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income taxes
Income tax expense	$ 42,463	$ 45,859	$ 138,490	$ 135,676
PR
Income taxes
Computed income tax at statutory rates	74,169	68,426	215,582	218,409
Net benefit of tax exempt interest income	(29,055)	(22,862)	(91,035)	(72,080)
Effect of income subject to preferential tax rate	(327)	(199)	(475)	(775)
Deferred tax asset valuation allowance	451	1,355	2,779	(2,217)
Difference in tax rates due to multiple jurisdictions	(6,764)	(2,839)	(11,893)	(11,879)
Other tax benefits			(4,500)	0
Tax on intercompany distributions			24,325	0
U.S., State and local taxes	3,429	2,436	6,669	8,829
Others	560	(458)	(2,962)	(4,611)
Income tax expense	$ 42,463	$ 45,859	$ 138,490	$ 135,676
% of pre-tax income
Computed income tax at statutory rates	38.00%	38.00%	38.00%	38.00%
Net benefit of tax exempt interest income	(13.00%)	(13.00%)	(16.00%)	(13.00%)
Effect of income subject to preferential tax rate	0.00%	0.00%	0.00%	0.00%
Deferred tax asset valuation allowance	0.00%	1.00%	0.00%	0.00%
Difference in tax rates due to multiple jurisdictions	(3.00%)	(2.00%)	(2.00%)	(3.00%)
Other tax benefits			(1.00%)	0.00%
Tax on intercompany distributions			4.00%	0.00%
U.S., State and local taxes	1.00%	1.00%	1.00%	2.00%
Others	0.00%	0.00%	(1.00%)	(1.00%)
Income tax expense	22.00%	25.00%	24.00%	23.00%

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