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) - PUERTO RICO - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Amount
Computed income tax at statutory rates	$ 47,359	$ 24,923	$ 93,092	$ 66,283
Net benefit of net tax exempt interest income	(15,890)	(16,141)	(31,474)	(31,169)
Deferred tax asset valuation allowance	3,436	(542,706)	8,709	(537,067)
Difference in tax rates due to multiple jurisdictions	(1,113)	(542)	(1,977)	(817)
State and local taxes	2,158	1,388	5,085	2,719
Other	1,218	(1,048)	(588)	965
Income tax expense	$ 32,446	$ (533,533)	$ 64,711	$ (500,964)
% 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	(13.00%)	(25.00%)	(13.00%)	(18.00%)
Deferred tax asset valuation allowance	3.00%	(849.00%)	3.00%	(316.00%)
Difference in tax rates due to multiple jurisdictions	(1.00%)	0.00%	(1.00%)	(1.00%)
State and local taxes	2.00%	2.00%	2.00%	1.00%
Income tax (benefit) expense	27.00%	(834.00%)	27.00%	(295.00%)
Effect Of Income Subject To Preferential Tax Rate
Amount
Income tax reconciliation, other deductions	$ (4,722)	$ 593	$ (8,136)	$ (1,878)
% of pre-tax income
Effective Income Tax Rate Reconciliation Deductions Other	(4.00%)	1.00%	(3.00%)	(1.00%)
Others
% of pre-tax income
Effective Income Tax Rate Reconciliation Deductions Other	1.00%	(2.00%)	0.00%	1.00%