Note Guarantees (Other Guarantees) - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Guarantor Obligations
Funds Advanced To Investors Under Servicing Agreements	$ 93,590	$ 88,371
Popular, Inc. Holding Co. | Debt Securities Payable
Guarantor Obligations
Guarantees, unamortized balance of the obligations	94,000	94,000
Financial Standby Letter Of Credit
Guarantor Obligations
Guarantees, unamortized balance of the obligations	500	300
Guarantee Type, Other | Popular, Inc. Holding Co. | Capital securities (trust preferred securities)
Guarantor Obligations
Guarantees, unamortized balance of the obligations	$ 374,000	$ 374,000