Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Amount
Income tax expense	$ 45,859	$ 67,986	$ 135,676	$ 182,677
PR
Amount
Computed income tax at statutory rates	68,426	183,893	218,409	385,567
Net benefit of tax exempt interest income	(22,862)	(35,403)	(72,080)	(112,669)
Effect of income subject to preferential tax rate	(199)	(109,588)	(775)	(116,630)
Deferred tax asset valuation allowance	1,355	3,724	(2,217)	9,662
Difference in tax rates due to multiple jurisdictions	(2,839)	(7,147)	(11,879)	(20,457)
Unrecognized tax benefits	0	(1,503)	0	(1,503)
State and local taxes	2,436	3,726	8,829	10,957
Other	(458)	30,284	(4,611)	27,750
Income tax expense	$ 45,859	$ 67,986	$ 135,676	$ 182,677
% 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%)	(8.00%)	(13.00%)	(12.00%)
Effect of income subject to preferential tax rate	0.00%	(22.00%)	0.00%	(11.00%)
Deferred tax asset valuation allowance	1.00%	1.00%	0.00%	1.00%
Difference in tax rates due to multiple jurisdictions	(2.00%)	(2.00%)	(3.00%)	(2.00%)
Unrecognized tax benefits	0.00%	0.00%	0.00%	0.00%
State and local taxes	1.00%	1.00%	2.00%	1.00%
Others	0.00%	6.00%	(1.00%)	3.00%
Income tax expense	25.00%	14.00%	23.00%	18.00%

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