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Note Income taxes (Differences between income tax expense (benefit) applicable to income before income taxes and amount computed by applying the statutory tax rate in Puerto Rico) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Amount    
Income tax expense $ 50,223 $ 22,155
PUERTO RICO    
Amount    
Computed income tax at statutory rates 81,806 44,257
Net benefit of net tax exempt interest income (26,944) (22,993)
Deferred tax asset valuation allowance 5,482 7,226
Difference in tax rates due to multiple jurisdictions (2,862) (2,959)
Effect of income subject to preferential tax rate (2,928) (3,048)
Adjustments in net deferred tax due to change in tax law 0 (5,133)
State and local taxes 1,624 1,363
Other (5,955) 3,442
Income tax expense $ 50,223 $ 22,155
% of pre-tax income    
Computed income tax at statutory rates 38.00% 39.00%
Net benefit of net tax exempt interest income (12.00%) (20.00%)
Deferred tax asset valuation allowance 2.00% 6.00%
Difference in tax rates due to multiple jurisdictions (1.00%) (2.00%)
Effect of income subject to preferential tax rate (1.00%) (3.00%)
Adjustments in net deferred tax due to change in tax law 0.00% (4.00%)
State and local taxes 0.00% 1.00%
Others (3.00%) 3.00%
Income tax (benefit) expense 23.00% 20.00%