Note Guarantees (Other Guarantees) - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
Funds Advanced To Investors Under Servicing Agreements	$ 71,167	$ 69,711
Popular, Inc. Holding Co. | Debt Securities Payable
Guarantor Obligations [Line Items]
Guarantees, unamortized balance of the obligations	149,000	149,000
Financial Standby Letter Of Credit
Guarantor Obligations [Line Items]
Guarantees, unamortized balance of the obligations	300	300
Guarantee Type, Other | Popular, Inc. Holding Co. | Capital securities (trust preferred securities)
Guarantor Obligations [Line Items]
Guarantees, unamortized balance of the obligations	$ 427,000	$ 427,000