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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Debt securities available-for-sale	$ 17,804,374	$ 24,968,269
Mortgage servicing rights	128,350	121,570	$ 118,395
Liabilities
Derivatives	(17,000)	(22,878)
US Treasury Securities
Assets
Debt securities available-for-sale	11,180,948	15,859,030
Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		70
Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	165,196	221,265
Mortgage Backed Securities
Assets
Debt securities available-for-sale	6,457,170	8,887,776
Other
Assets
Debt securities available-for-sale	1,060	128
Recurring
Assets
Debt securities available-for-sale	17,804,374	24,968,269
Trading account debt securities, excluding derivatives	27,723	29,711
Equity securities at fair value	29,632	32,506
Mortgage servicing rights	128,350	121,570
Derivatives	19,229	26,093
Total assets measured at fair value on recurring /nonrecurring basis	18,009,308	25,178,149
Liabilities
Derivatives	(17,000)	(22,878)
Contingent consideration		(9,241)
Total	(17,000)	(32,119)
Recurring \| US Treasury Securities
Assets
Debt securities available-for-sale	11,180,948	15,859,030
Trading account debt securities, excluding derivatives	13,069	6,530
Recurring \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		70
Recurring \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	64	85
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	165,196	221,265
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	160	257
Recurring \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	6,457,170	8,887,776
Trading account debt securities, excluding derivatives	14,223	22,559
Recurring \| Other
Assets
Debt securities available-for-sale	1,060	128
Trading account debt securities, excluding derivatives	207	280
Recurring \| Level 1
Assets
Debt securities available-for-sale	1,908,589	0
Trading account debt securities, excluding derivatives	13,069	6,530
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Total assets measured at fair value on recurring /nonrecurring basis	1,921,658	6,530
Liabilities
Derivatives	0	0
Contingent consideration		0
Total	0	0
Recurring \| Level 1 \| US Treasury Securities
Assets
Debt securities available-for-sale	1,908,589	0
Trading account debt securities, excluding derivatives	13,069	6,530
Recurring \| Level 1 \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		0
Recurring \| Level 1 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	0	0
Recurring \| Level 1 \| CMO
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 1 \| Other
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 2
Assets
Debt securities available-for-sale	15,894,074	24,967,443
Trading account debt securities, excluding derivatives	14,119	22,703
Equity securities at fair value	29,302	32,429
Mortgage servicing rights	0	0
Derivatives	19,229	26,093
Total assets measured at fair value on recurring /nonrecurring basis	15,956,724	25,048,668
Liabilities
Derivatives	(17,000)	(22,878)
Contingent consideration		0
Total	(17,000)	(22,878)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt securities available-for-sale	9,272,359	15,859,030
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 2 \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		70
Recurring \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	64	85
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	165,196	221,265
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	47	59
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	6,456,459	8,886,950
Trading account debt securities, excluding derivatives	14,008	22,559
Recurring \| Level 2 \| Other
Assets
Debt securities available-for-sale	60	128
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3
Assets
Debt securities available-for-sale	1,711	826
Trading account debt securities, excluding derivatives	535	478
Equity securities at fair value	0	0
Mortgage servicing rights	128,350	121,570
Derivatives	0	0
Total assets measured at fair value on recurring /nonrecurring basis	130,596	122,874
Liabilities
Derivatives	0	0
Contingent consideration		(9,241)
Total	0	(9,241)
Recurring \| Level 3 \| US Treasury Securities
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		0
Recurring \| Level 3 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	0	0
Recurring \| Level 3 \| CMO
Assets
Trading account debt securities, excluding derivatives	113	198
Recurring \| Level 3 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	711	826
Trading account debt securities, excluding derivatives	215	0
Recurring \| Level 3 \| Other
Assets
Debt securities available-for-sale	1,000	0
Trading account debt securities, excluding derivatives	207	280
Recurring \| NAV
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Equity securities at fair value	330	77
Mortgage servicing rights	0	0
Derivatives	0	0
Total assets measured at fair value on recurring /nonrecurring basis	330	77
Liabilities
Derivatives	0	0
Contingent consideration		0
Total	0	0
Recurring \| NAV \| US Treasury Securities
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| NAV \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale		0
Recurring \| NAV \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| NAV \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	0	0
Recurring \| NAV \| CMO
Assets
Trading account debt securities, excluding derivatives	0	0
Recurring \| NAV \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Recurring \| NAV \| Other
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	$ 0	$ 0