Goodwill and other intangible assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jul. 31, 2024	Dec. 31, 2023	Jul. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization Of Intangible Assets	$ 704,000	$ 795,000	$ 2,233,000	$ 2,385,000
Goodwill increase decrease	0		0
Goodwill on acquisition			0	0
Goodwill impairment	0	23,000,000	0	23,000,000
Goodwill	804,428,000	804,428,000	804,428,000	804,428,000		$ 804,428,000		$ 827,428,000
Banco Popular de Puerto Rico
Goodwill and Intangible Assets Disclosure [Line Items]
Fair Value Excess Over Carrying Amount					$ 3,700,000,000		$ 3,700,000,000
Goodwill on acquisition			0	0
Goodwill impairment			0	0
Goodwill	$ 436,383,000	$ 436,383,000	$ 436,383,000	$ 436,383,000		$ 436,383,000		$ 436,383,000