Cost of equity to discount the cash flow using the ibbotson build-up method.

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Goodwill and Intangible Assets Disclosure [Line Items]

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The percentage of goodwill from two subsidiaries to total goodwill as of the balance sheet date if other than 100 percent.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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

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Goodwill and other intangible assets - Additional Information (Details) - USD ($)	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jul. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 31, 2020
Goodwill and other intangible assets
Amortization Of Intangible Assets	$ 783,000	$ 1,076,000		$ 3,089,000	$ 5,345,000
Identifiable intangible assets	6,100,000			6,100,000		$ 6,100,000
Changes in the carrying amount of goodwill	$ 0	$ 0		$ 0	$ 0
Goodwill impairment charge			$ 0
Discounted cash flow approach \| Minimum
Goodwill and other intangible assets
Cost of equity discount rate	11.34%			11.34%
Discounted cash flow approach \| Maximum
Goodwill and other intangible assets
Cost of equity discount rate	15.13%			15.13%
Customer relationship
Goodwill and other intangible assets
Amortization Of Intangible Assets				$ 14,900,000
Finite-Lived Customer Relationships, Gross	$ 11,679,000			11,679,000		$ 26,397,000
Customer relationship \| Credit card portfolio acquisition
Goodwill and other intangible assets
Amortization Of Intangible Assets				$ 14,200,000
Banco Popular de Puerto Rico
Goodwill and other intangible assets
Step 1 Fair Value Excess Over Carrying Amount			$ 1,500,000,000				$ 282,000,000
Percentage excess of fair value of reporting unit over equity value			50.00%				9.00%
Popular U.S.
Goodwill and other intangible assets
Step 1 Fair Value Excess Over Carrying Amount			$ 412,000,000				$ 215,000,000
Percentage excess of fair value of reporting unit over equity value			24.00%				13.00%
Banco Popular de Puerto Rico and Popular Bank
Goodwill and other intangible assets
Percentage Of Goodwill			91.00%