Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Amount
Income tax expense	$ 76,831	$ 3,097
PR
Amount
Computed income tax at statutory rates	127,299	14,025
Benefit of net tax exempt interest income	(34,163)	(32,896)
Deferred tax asset valuation allowance	10,321	5,538
Difference in tax rates due to multiple jurisdictions	(10,948)	8,875
Effect of income subject to preferential tax rate	(3,329)	(1,900)
Adjustments in net deferred tax due to change in tax law	(10,328)	9,004
State and local taxes	61	(555)
Other	(2,082)	1,006
Income tax expense	$ 76,831	$ 3,097
% of pre-tax income
Computed income tax at statutory rates	38.00%	38.00%
Benefit of net tax exempt interest income	(10.00%)	(88.00%)
Deferred tax asset valuation allowance	3.00%	15.00%
Difference in tax rates due to multiple jurisdictions	(3.00%)	24.00%
Effect of income subject to preferential tax rate	(1.00%)	(5.00%)
Adjustments in net deferred tax due to change in tax law	(3.00%)	24.00%
State and local taxes	0.00%	(2.00%)
Others	(1.00%)	2.00%
Income tax expense	23.00%	8.00%

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