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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amount        
Income tax expense $ (19,966) $ 15,839 $ 48,772 $ 80,550
PUERTO RICO        
Amount        
Computed income tax at statutory rates 272 24,434 100,857 117,525
Net benefit of net tax exempt interest income (19,563) (15,620) (56,408) (47,094)
Deferred tax asset valuation allowance 5,142 5,698 15,262 14,407
Difference in tax rates due to multiple jurisdictions 189 (897) (1,601) (2,874)
Unrecognized tax benefits (1,185) (4,442) (1,185) (4,442)
State and local taxes (64) 1,557 2,800 6,642
Income tax expense $ (19,966) $ 15,839 $ 48,772 $ 80,550
% 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 (2803.00%) (25.00%) (22.00%) (16.00%)
Deferred tax asset valuation allowance 737.00% 9.00% 6.00% 5.00%
Difference in tax rates due to multiple jurisdictions 27.00% (1.00%) (1.00%) (1.00%)
State and local taxes (9.00%) 2.00% 1.00% 2.00%
Unrecognized tax benefits (170.00%) (7.00%) 0.00% (1.00%)
Income tax (benefit) expense (2861.00%) 25.00% 19.00% 26.00%
PUERTO RICO | Effect Of Income Subject To Preferential Tax Rate        
Amount        
Effect of income subject to preferential tax rate $ (3,313) $ 6,364 $ (9,825) $ (1,772)
% of pre-tax income        
Others (475.00%) 10.00% (4.00%) (1.00%)
PUERTO RICO | Others        
Amount        
Effect of income subject to preferential tax rate $ (1,444) $ (1,255) $ (1,128) $ (1,842)
% of pre-tax income        
Others (207.00%) (2.00%) 0.00% (1.00%)