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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets
Debt securities available-for-sale	$ 26,359,915	$ 24,968,269
Mortgage servicing rights	125,358	121,570	$ 122,543	$ 118,395
US Treasury Securities
Assets
Debt securities available-for-sale	18,179,111	15,859,030
Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale	71	70
Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	191,215	221,265
Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,989,407	8,887,776
Other
Assets
Debt securities available-for-sale	111	128
Recurring
Assets
Debt securities available-for-sale	26,359,915	24,968,269
Trading account debt securities, excluding derivatives	36,040	29,711
Equity securities at fair value	31,038	32,506
Mortgage servicing rights	125,358	121,570
Derivatives	24,848	26,093
Total assets measured at fair value on a nonrecurring basis	26,577,199	25,178,149
Liabilities
Derivatives	(20,218)	(22,878)
Contingent consideration	(9,241)	(9,241)
Total	(29,459)	(32,119)
Recurring \| US Treasury Securities
Assets
Debt securities available-for-sale	18,179,111	15,859,030
Trading account debt securities, excluding derivatives	16,686	6,530
Recurring \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale	71	70
Recurring \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	81	85
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	191,215	221,265
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	227	257
Recurring \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,989,407	8,887,776
Trading account debt securities, excluding derivatives	18,779	22,559
Recurring \| Other
Assets
Debt securities available-for-sale	111	128
Trading account debt securities, excluding derivatives	267	280
Recurring \| Level 1
Assets
Debt securities available-for-sale	1,799,951	0
Trading account debt securities, excluding derivatives	16,686	6,530
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Total assets measured at fair value on a nonrecurring basis	1,816,637	6,530
Liabilities
Derivatives	0	0
Contingent consideration	0	0
Total	0	0
Recurring \| Level 1 \| US Treasury Securities
Assets
Debt securities available-for-sale	1,799,951	0
Trading account debt securities, excluding derivatives	16,686	6,530
Recurring \| Level 1 \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale	0	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	24,559,171	24,967,443
Trading account debt securities, excluding derivatives	18,913	22,703
Equity securities at fair value	30,872	32,429
Mortgage servicing rights	0	0
Derivatives	24,848	26,093
Total assets measured at fair value on a nonrecurring basis	24,633,804	25,048,668
Liabilities
Derivatives	(20,218)	(22,878)
Contingent consideration	0	0
Total	(20,218)	(22,878)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt securities available-for-sale	16,379,160	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	71	70
Recurring \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	81	85
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	191,215	221,265
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	53	59
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,988,614	8,886,950
Trading account debt securities, excluding derivatives	18,779	22,559
Recurring \| Level 2 \| Other
Assets
Debt securities available-for-sale	111	128
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3
Assets
Debt securities available-for-sale	793	826
Trading account debt securities, excluding derivatives	441	478
Equity securities at fair value	0	0
Mortgage servicing rights	125,358	121,570
Derivatives	0	0
Total assets measured at fair value on a nonrecurring basis	126,592	122,874
Liabilities
Derivatives	0	0
Contingent consideration	(9,241)	(9,241)
Total	(9,241)	(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	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	174	198	251
Recurring \| Level 3 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	793	826
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Other
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	267	280	$ 372
Recurring \| NAV
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Equity securities at fair value	166	77
Mortgage servicing rights	0	0
Derivatives	0	0
Total assets measured at fair value on a nonrecurring basis	166	77
Liabilities
Derivatives	0	0
Contingent consideration	0	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	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