Note Guarantees (Changes in the Corporation's liability of estimated losses associated with customary respresentations and warranties related to loans sold by BPPR) (Detail) - Indemnification Guarantee - Banco Popular de Puerto Rico - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Guarantor Obligations [Line Items]
Balance as of beginning of period	$ 10,545	$ 10,702	$ 10,936	$ 8,087
Provision (reversal) for representations and warranties	(140)	(34)	(521)	2,767
Net charge-offs	0	(27)	(10)	(213)
Balance as of end of period	$ 10,405	$ 10,641	$ 10,405	$ 10,641