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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loans
Related Party Transaction [Line Items]
Interest Income Related Party		$ 0		$ 9
Deposits
Related Party Transaction [Line Items]
Interest Expense Related Party	$ (5)	(8)	$ (16)	(23)
Total
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ (5)	$ (8)	$ (16)	$ (14)