Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Amount
Income tax expense	$ 46,314	$ 50,479
PR
Amount
Computed income tax at statutory rates	76,985	98,312
Net benefit of tax exempt interest income	(21,902)	(42,869)
Effect of income subject to preferential tax rate	(855)	(3,945)
Deferred tax asset valuation allowance	(4,565)	3,891
Difference in tax rates due to multiple jurisdictions	(5,169)	(6,493)
State and local taxes	3,355	3,665
Other	(1,535)	(2,082)
Income tax expense	$ 46,314	$ 50,479
% of pre-tax income
Computed income tax at statutory rates	38.00%	38.00%
Net benefit of tax exempt interest income	(11.00%)	(16.00%)
Effect of income subject to preferential tax rate	0.00%	(2.00%)
Deferred tax asset valuation allowance	(2.00%)	1.00%
Difference in tax rates due to multiple jurisdictions	(3.00%)	(2.00%)
State and local taxes	2.00%	1.00%
Others	(1.00%)	(1.00%)
Income tax expense	23.00%	19.00%

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