Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Amount
Income tax expense	$ 67,986	$ 83,542	$ 182,677	$ 233,466
PR
Amount
Computed income tax at statutory rates	183,893	124,370	385,567	360,859
Net benefit of tax exempt interest income	(45,499)	(34,294)	(123,324)	(105,297)
Deferred tax asset valuation allowance	3,724	3,529	9,662	19,682
Difference in tax rates due to multiple jurisdictions	(7,147)	(9,600)	(20,457)	(25,429)
Effect of income subject to preferential tax rate	(109,588)	(5,441)	(116,630)	(10,175)
Adjustment due to estimate on the annual effective rate	10,096	4,001	10,655	(6,732)
Unrecognized tax benefits	(1,503)	(5,484)	(1,503)	(5,484)
State and local taxes	3,726	6,352	10,957	8,943
Other	30,284	109	27,750	(2,901)
Income tax expense	$ 67,986	$ 83,542	$ 182,677	$ 233,466
% 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	(9.00%)	(10.00%)	(12.00%)	(11.00%)
Deferred tax asset valuation allowance	1.00%	1.00%	1.00%	2.00%
Difference in tax rates due to multiple jurisdictions	(2.00%)	(3.00%)	(2.00%)	(3.00%)
Effect of income subject to preferential tax rate	(22.00%)	(2.00%)	(11.00%)	(1.00%)
Adjustment due to estimate on the annual effective rate	2.00%	1.00%	1.00%	(1.00%)
Unrecognized tax benefits	0.00%	(2.00%)	0.00%	(1.00%)
State and local taxes	1.00%	2.00%	1.00%	1.00%
Others	6.00%	0.00%	3.00%	0.00%
Income tax expense	14.00%	25.00%	18.00%	24.00%

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