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Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets
Debt securities available-for-sale	$ 26,266,251	$ 24,968,269
Mortgage servicing rights	129,877	121,570	$ 119,467	$ 118,395
US Treasury Securities
Assets
Debt securities available-for-sale	18,840,482	15,859,030
Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale	70	70
Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	172,784	221,265
Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,252,320	8,887,776
Other
Assets
Debt securities available-for-sale	595	128
Recurring
Assets
Debt securities available-for-sale	26,266,251	24,968,269
Trading account debt securities, excluding derivatives	32,317	29,711
Equity securities at fair value	28,429	32,506
Mortgage servicing rights	129,877	121,570
Derivatives	17,218	26,093
Total assets measured at fair value on a nonrecurring basis	26,474,092	25,178,149
Liabilities
Derivatives	(16,173)	(22,878)
Contingent consideration	(9,241)	(9,241)
Total	(25,414)	(32,119)
Recurring \| US Treasury Securities
Assets
Debt securities available-for-sale	18,840,482	15,859,030
Trading account debt securities, excluding derivatives	16,873	6,530
Recurring \| Obligations of U.S. Government sponsored entities
Assets
Debt securities available-for-sale	70	70
Recurring \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	73	85
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	172,784	221,265
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	203	257
Recurring \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,252,320	8,887,776
Trading account debt securities, excluding derivatives	14,904	22,559
Recurring \| Other
Assets
Debt securities available-for-sale	595	128
Trading account debt securities, excluding derivatives	264	280
Recurring \| Level 1
Assets
Debt securities available-for-sale	2,019,437	0
Trading account debt securities, excluding derivatives	16,873	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	2,036,310	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	2,019,437	0
Trading account debt securities, excluding derivatives	16,873	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	24,245,535	24,967,443
Trading account debt securities, excluding derivatives	15,028	22,703
Equity securities at fair value	28,214	32,429
Mortgage servicing rights	0	0
Derivatives	17,218	26,093
Total assets measured at fair value on a nonrecurring basis	24,305,995	25,048,668
Liabilities
Derivatives	(16,173)	(22,878)
Contingent consideration	0	0
Total	(16,173)	(22,878)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt securities available-for-sale	16,821,045	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	70
Recurring \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	73	85
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	172,784	221,265
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	51	59
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	7,251,541	8,886,950
Trading account debt securities, excluding derivatives	14,904	22,559
Recurring \| Level 2 \| Other
Assets
Debt securities available-for-sale	95	128
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3
Assets
Debt securities available-for-sale	1,279	826
Trading account debt securities, excluding derivatives	416	478
Equity securities at fair value	0	0
Mortgage servicing rights	129,877	121,570
Derivatives	0	0
Total assets measured at fair value on a nonrecurring basis	131,572	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	152	198	250
Recurring \| Level 3 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	779	826
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3 \| Other
Assets
Debt securities available-for-sale	500	0
Trading account debt securities, excluding derivatives	264	280	$ 361
Recurring \| NAV
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Equity securities at fair value	215	77
Mortgage servicing rights	0	0
Derivatives	0	0
Total assets measured at fair value on a nonrecurring basis	215	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