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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%

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