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Note Goodwill and other intangible assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Aug. 01, 2018	Jul. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization Of Intangible Assets	$ 2,324	$ 2,345	$ 6,973	$ 7,034
Trademark recognized	$ 6,100		6,100				$ 6,100
Goodwill on acquisition			$ 60,242
Maximum | Discounted cash flow approach
Goodwill and Intangible Assets Disclosure [Line Items]
Cost of equity discount rate	13.93%		13.93%
Minimum | Discounted cash flow approach
Goodwill and Intangible Assets Disclosure [Line Items]
Cost of equity discount rate	11.42%		11.42%
Reliable Financial Services
Goodwill and Intangible Assets Disclosure [Line Items]
Trademark recognized					$ 488
Reliable Financial Services | Trademarks
Goodwill and Intangible Assets Disclosure [Line Items]
Trademark recognized	$ 500		$ 500
Banco Popular de Puerto Rico and Popular Bank
Goodwill and Intangible Assets Disclosure [Line Items]
Percentage Of Goodwill						98.00%
PB
Goodwill and Intangible Assets Disclosure [Line Items]
Step 1 Fair Value Excess Over Carrying Amount						$ 407,000
Percentage excess of fair value of reporting unit over equity value						28.00%
BPPR
Goodwill and Intangible Assets Disclosure [Line Items]
Step 1 Fair Value Excess Over Carrying Amount						$ 2,400
Percentage excess of fair value of reporting unit over equity value						77.00%
Goodwill on acquisition			$ 60,242
BPPR | Reliable Financial Services
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill on acquisition	$ 60,200

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Goodwill and Intangible Assets Disclosure [Line Items]

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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The amount of identifiable intangible assets recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of fair value of reporting unit in excess of carrying amount.

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