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Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amount      
Change in tax rates $ 1,000    
Income tax expense 134,197 $ 132,330 $ 309,018
PR      
Amount      
Computed income tax at statutory rates 253,327 463,114 466,465
Net benefit of tax exempt interest income (95,222) (165,065) (139,426)
Effect of income subject to preferential tax rate (1,854) (86,797) (11,981)
Deferred tax asset valuation allowance 2,304 (21,469) 20,932
NOL Adjustments 0 (34,817) 0
Difference in tax rates due to multiple jurisdictions (12,857) (26,887) (30,719)
Change in tax rates (18,714) 0 0
Unrecognized tax benefits (1,529) (1,503) (5,484)
Other tax benefits (2,925) 0 0
State and local taxes 25,401 14,981 14,629
Others (13,734) (9,227) (5,398)
Income tax expense $ 134,197 $ 132,330 $ 309,018
% of pre-tax income      
Computed income tax at statutory rates 38.00% 38.00% 38.00%
Net benefit of tax exempt interest income (14.00%) (13.00%) (12.00%)
Effect of income subject to preferential tax rate 0.00% (7.00%) (1.00%)
Deferred tax asset valuation allowance 0.00% (2.00%) 2.00%
NOL Adjustments 0.00% (3.00%) 0.00%
Difference in tax rates due to multiple jurisdictions (2.00%) (2.00%) (3.00%)
Change in tax rates (3.00%) 0.00% 0.00%
Unrecognized tax benefits 0.00% 0.00% 0.00%
Other tax benefits 0.00% 0.00% 0.00%
State and local taxes 3.00% 1.00% 1.00%
Others (2.00%) (1.00%) 0.00%
Income tax expense 20.00% 11.00% 25.00%