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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amount        
Income tax expense $ 35,732 $ 32,446 $ 68,738 $ 64,711
PUERTO RICO        
Amount        
Computed income tax at statutory rates 51,464 47,359 100,585 93,092
Net benefit of net tax exempt interest income (18,841) (15,890) (36,845) (31,474)
Deferred tax asset valuation allowance 5,064 3,436 10,120 8,709
Difference in tax rates due to multiple jurisdictions (831) (1,113) (1,790) (1,977)
State and local taxes 1,585 2,158 2,864 5,085
Income tax expense $ 35,732 $ 32,446 $ 68,738 $ 64,711
% of pre-tax income        
Computed income tax at statutory rates 39.00% 39.00% 39.00% 39.00%
Net benefit of net tax exempt interest income (14.00%) (13.00%) (14.00%) (13.00%)
Deferred tax asset valuation allowance 4.00% 3.00% 4.00% 3.00%
Difference in tax rates due to multiple jurisdictions (1.00%) (1.00%) (1.00%) (1.00%)
State and local taxes 1.00% 2.00% 1.00% 2.00%
Income tax (benefit) expense 27.00% 27.00% 27.00% 27.00%
PUERTO RICO | Effect Of Income Subject To Preferential Tax Rate        
Amount        
Effect of income subject to preferential tax rate $ (3,493) $ (4,722) $ (6,512) $ (8,136)
% of pre-tax income        
Others (3.00%) (4.00%) (2.00%) (3.00%)
PUERTO RICO | Others        
Amount        
Effect of income subject to preferential tax rate $ 784 $ 1,218 $ 316 $ (588)
% of pre-tax income        
Others 1.00% 1.00% 0.00% 0.00%