Note Segment reporting (Geographic information) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 648,945	$ 491,272	$ 1,155,489	$ 969,239
PUERTO RICO
Segment Reporting Information [Line Items]
Net Revenue	[1]	542,173	394,086	941,587	778,534
UNITED STATES
Segment Reporting Information [Line Items]
Net Revenue	[1]	87,045	78,283	173,573	153,126
Other
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 19,727	$ 18,903	$ 40,329	$ 37,579

[1] Total revenues include net interest income (expense) , service charges on deposit accounts, other service fees, mortgage banking activities, net gain (loss) and valuation adjustments on investment securities, trading account (loss) profit, net (loss) gain on sale of loans and valuation adjustments on loans held-for-sale, adjustments to indemnity reserves on loans sold, FDIC loss share ( expense ) income and other operating income .