Fair value measurement - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Debt securities available-for-sale	$ 18,245,903	$ 16,729,044
Mortgage servicing rights	108,103	118,109	$ 128,350
Liabilities
Derivatives	(22,832)	(21,103)
US Treasury Securities
Assets
Debt securities available-for-sale	12,995,110	10,747,061
Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	120,284	134,686
Other
Assets
Debt securities available-for-sale	2,250	2,511
Recurring
Assets
Debt securities available-for-sale	18,245,903	16,729,044
Trading account debt securities, excluding derivatives	32,783	31,568
Equity securities at fair value	46,045	38,275
Mortgage servicing rights	108,103	118,109
Loans held-for-sale	5,423	3,239
Derivatives	26,023	24,419
Total assets measured at fair value on a recurring basis	18,464,280	16,944,654
Liabilities
Derivatives	(22,832)	(21,103)
Total	(22,832)	(21,103)
Recurring \| US Treasury Securities
Assets
Debt securities available-for-sale	12,995,110	10,747,061
Trading account debt securities, excluding derivatives	2,824	16,859
Recurring \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	55	71
Recurring \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	120,284	134,686
Recurring \| CMO
Assets
Trading account debt securities, excluding derivatives	655	98
Recurring \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	5,128,259	5,844,786
Trading account debt securities, excluding derivatives	29,116	14,373
Recurring \| Other
Assets
Debt securities available-for-sale	2,250	2,511
Trading account debt securities, excluding derivatives	133	167
Recurring \| Level 1
Assets
Debt securities available-for-sale	7,512,171	3,936,036
Trading account debt securities, excluding derivatives	2,814	16,859
Equity securities at fair value	0	0
Mortgage servicing rights	0	0
Loans held-for-sale	0	0
Derivatives	0	0
Total assets measured at fair value on a recurring basis	7,514,985	3,952,895
Liabilities
Derivatives	0	0
Total	0	0
Recurring \| Level 1 \| US Treasury Securities
Assets
Debt securities available-for-sale	7,512,171	3,936,036
Trading account debt securities, excluding derivatives	2,814	16,859
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	10,730,998	12,789,902
Trading account debt securities, excluding derivatives	29,752	14,425
Equity securities at fair value	45,664	37,965
Mortgage servicing rights	0	0
Loans held-for-sale	5,423	3,239
Derivatives	26,023	24,419
Total assets measured at fair value on a recurring basis	10,837,860	12,869,950
Liabilities
Derivatives	(22,832)	(21,103)
Total	(22,832)	(21,103)
Recurring \| Level 2 \| US Treasury Securities
Assets
Debt securities available-for-sale	5,482,939	6,811,025
Trading account debt securities, excluding derivatives	10	0
Recurring \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Assets
Trading account debt securities, excluding derivatives	55	71
Recurring \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Assets
Debt securities available-for-sale	120,284	134,686
Recurring \| Level 2 \| CMO
Assets
Trading account debt securities, excluding derivatives	655	93
Recurring \| Level 2 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	5,127,775	5,844,180
Trading account debt securities, excluding derivatives	29,032	14,261
Recurring \| Level 2 \| Other
Assets
Debt securities available-for-sale	0	11
Trading account debt securities, excluding derivatives	0	0
Recurring \| Level 3
Assets
Debt securities available-for-sale	2,734	3,106
Trading account debt securities, excluding derivatives	217	284
Equity securities at fair value	0	0
Mortgage servicing rights	108,103	118,109
Loans held-for-sale	0	0
Derivatives	0	0
Total assets measured at fair value on a recurring basis	111,054	121,499
Liabilities
Derivatives	0	0
Total	0	0
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 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	0	5
Recurring \| Level 3 \| Mortgage Backed Securities
Assets
Debt securities available-for-sale	484	606
Trading account debt securities, excluding derivatives	84	112
Recurring \| Level 3 \| Other
Assets
Debt securities available-for-sale	2,250	2,500
Trading account debt securities, excluding derivatives	133	167
Recurring \| NAV
Assets
Debt securities available-for-sale	0	0
Trading account debt securities, excluding derivatives	0	0
Equity securities at fair value	381	310
Mortgage servicing rights	0	0
Loans held-for-sale	0	0
Derivatives	0	0
Total assets measured at fair value on a recurring basis	381	310
Liabilities
Derivatives	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 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

Fair value portion of asset recognized for present right to economic benefit.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- References

No definition available.

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Section 45
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-URI https://asc.fasb.org/1943274/2147481260/860-50-45-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-URI https://asc.fasb.org/1943274/2147481260/860-50-45-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481260/860-50-45-2

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

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