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Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amount      
Income tax expense $ 132,330 $ 309,018 $ 111,938
PR      
Amount      
Computed income tax at statutory rates 463,114 466,465 231,960
Benefit of net tax exempt interest income (165,065) (139,426) (126,232)
Effect of income subject to preferential tax rate (86,797) (11,981) (10,141)
Deferred tax asset valuation allowance (21,469) 20,932 15,276
NOL Adjustments (34,817) 0 0
Difference in tax rates due to multiple jurisdictions (26,887) (30,719) (1,903)
Unrecognized tax benefits (1,503) (5,484) (2,163)
State and local taxes 14,981 14,629 4,350
Other (9,227) (5,398) 791
Income tax expense $ 132,330 $ 309,018 $ 111,938
% of pre-tax income      
Computed income tax at statutory rates 38.00% 38.00% 38.00%
Benefit of net tax exempt interest income (13.00%) (12.00%) (20.00%)
Effect of income subject to preferential tax rate (7.00%) (1.00%) (2.00%)
Deferred tax asset valuation allowance (2.00%) 2.00% 2.00%
NOL Adjustments (3.00%) 0.00% 0.00%
Difference in tax rates due to multiple jurisdictions (2.00%) (3.00%) 0.00%
Unrecognized tax benefits 0.00% 0.00% 0.00%
State and local taxes 1.00% 1.00% 0.00%
Others (1.00%) 0.00% 0.00%
Income tax expense 11.00% 25.00% 18.00%