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Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Amount    
Income tax expense $ 50,479 $ 76,831
PR    
Amount    
Computed income tax at statutory rates 98,312 127,299
Net benefit of tax exempt interest income (36,489) (34,163)
Deferred tax asset valuation allowance 3,891 10,321
Difference in tax rates due to multiple jurisdictions (6,493) (10,948)
Effect of income subject to preferential tax rate (3,945) (3,329)
Adjustment due to estimate on the annual effective rate (6,380) (10,328)
State and local taxes 3,665 61
Other (2,082) (2,082)
Income tax expense $ 50,479 $ 76,831
% of pre-tax income    
Computed income tax at statutory rates 38.00% 38.00%
Net benefit of tax exempt interest income (14.00%) (10.00%)
Deferred tax asset valuation allowance 1.00% 3.00%
Difference in tax rates due to multiple jurisdictions (2.00%) (3.00%)
Effect of income subject to preferential tax rate (2.00%) (1.00%)
Adjustment due to estimate on the annual effective rate (2.00%) (3.00%)
State and local taxes 1.00% 0.00%
Others (1.00%) (1.00%)
Income tax expense 19.00% 23.00%