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Income taxes - Differences between income tax expense (benefit) in Puerto Rico (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amount      
Income tax expense $ 309,018 $ 111,938 $ 147,181
PR      
Amount      
Computed income tax at statutory rates 466,465 231,960 306,869
Benefit of net tax exempt interest income (139,426) (126,232) (145,597)
Effect of income subject to preferential tax rate (11,981) (10,141) (9,562)
Deferred tax asset valuation allowance 20,932 15,276 16,992
Difference in tax rates due to multiple jurisdictions (30,719) (1,903) (12,888)
Adjustments in net deferred tax due to change in tax law 0 0 (6,559)
Unrecognized tax benefits (5,484) (2,163) 0
State and local taxes 14,629 4,350 4,749
Other (5,398) 791 (6,823)
Income tax expense $ 309,018 $ 111,938 $ 147,181
% of pre-tax income      
Computed income tax at statutory rates 38.00% 38.00% 38.00%
Benefit of net tax exempt interest income (12.00%) (20.00%) (18.00%)
Effect of income subject to preferential tax rate (1.00%) (2.00%) (1.00%)
Deferred tax asset valuation allowance 2.00% 2.00% 2.00%
Difference in tax rates due to multiple jurisdictions (3.00%) 0.00% (2.00%)
Adjustments in net deferred tax due to change in tax law 0.00% 0.00% (1.00%)
Unrecognized tax benefits 0.00% 0.00% 0.00%
State and local taxes 1.00% 0.00% 1.00%
Others 0.00% 0.00% (1.00%)
Income tax expense 25.00% 18.00% 18.00%