Note Related party transactions (Impact on the results of operations of transactions between the Corporation and PRAP 2013-1 International, LLC) (Detail) - PR Asset Portfolio 2013-1 International, LLC - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Related Party Transaction Revenues From Transactions With Related Party	$ (8)	$ 188	$ (14)	$ 920
Loans
Related Party Transaction [Line Items]
Interest Income Related Party	0	189	9	923
Deposits
Related Party Transaction [Line Items]
Interest Expense Related Party	$ (8)	$ (1)	$ (23)	$ (3)