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Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Amount        
Income tax expense $ 41,168 $ 41,370 $ 68,893 $ 131,923
PUERTO RICO        
Amount        
Computed income tax at statutory rates 78,594 77,508 149,715 238,602
Net benefit of net tax exempt interest income (31,177) (38,103) (93,497) (95,986)
Deferred tax asset valuation allowance 2,185 3,170 10,333 9,915
Difference in tax rates due to multiple jurisdictions (2,584) (4,233) 2,081 (9,851)
Effect of income subject to preferential tax rate (3,095) (2,243) (7,722) (7,458)
Adjustments in net deferred tax due to change in tax law (4,030) 2,711 2,821 0
Unrecognized tax benefits (2,163) 0 (2,163) 0
State and local taxes 3,748 2,180 5,807 5,535
Other (310) 380 1,518 (8,834)
Income tax expense $ 41,168 $ 41,370 $ 68,893 $ 131,923
% of pre-tax income        
Computed income tax at statutory rates 38.00% 38.00% 38.00% 38.00%
Net benefit of net tax exempt interest income (15.00%) (18.00%) (24.00%) (15.00%)
Deferred tax asset valuation allowance 1.00% 1.00% 3.00% 2.00%
Difference in tax rates due to multiple jurisdictions (1.00%) (2.00%) 1.00% (2.00%)
Effect of income subject to preferential tax rate (2.00%) (1.00%) (2.00%) (1.00%)
Adjustments in net deferred tax due to change in tax law (2.00%) 1.00% 1.00% 0.00%
Unrecognized tax benefits (1.00%) 0.00% (1.00%) 0.00%
State and local taxes 2.00% 1.00% 1.00% 1.00%
Others 0.00% 0.00% 0.00% (2.00%)
Income tax expense 20.00% 20.00% 17.00% 21.00%