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Note Related party transactions (Impact on the results of operations of transactions between the Corporation and EVERTEC) (Detail) - EVERTEC Inc. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Deposits
Related Party Transaction [Line Items]
Interest Expense Related Party	$ (21)	$ (12)	$ (46)	$ (33)
Other Fee Revenue
Related Party Transaction [Line Items]
Related Party Transaction Revenues From Transactions With Related Party	8,486	7,061	24,940	22,656
Rental Income
Related Party Transaction [Line Items]
Related Party Transaction Revenues From Transactions With Related Party	1,781	1,737	5,297	5,119
Processing Fees
Related Party Transaction [Line Items]
Expenses from Transactions with related party	(48,360)	(43,855)	(142,443)	(132,289)
Other Expense
Related Party Transaction [Line Items]
Related Party Transaction Revenues From Transactions With Related Party	279	291	884	900
Total
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ (37,835)	$ (34,778)	$ (111,368)	$ (103,647)