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Fair value of financial instruments - Carrying or notional amounts and estimated fair values for financial instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financial Assets:        
Cash and due from banks $ 400,631 $ 419,638    
Money market investments 6,340,786 6,380,948    
Debt securities available-for-sale 20,490,212 18,245,903    
Debt securities held-to-maturity 7,535,725 7,752,760    
Equity securities:        
Equity securities, at lower of cost or realizable value 222,391 208,166    
Loans held in portfolio 37,415,693 36,361,628    
Mortgage servicing rights 103,077 108,103 $ 113,386 $ 118,109
Deposits        
Time deposits 9,598,786 9,012,882    
Deposits 67,217,491 64,884,345    
Assets sold under agreements to repurchase 56,043 54,833    
Other short-term borrowings 550,000 225,000    
Notes payable:        
Notes payable 808,451 896,293    
US Treasury Securities        
Financial Assets:        
Debt securities available-for-sale 15,412,796 12,995,110    
Debt securities held-to-maturity 7,479,657 7,693,418    
Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 48,598 51,865    
Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities available-for-sale 110,432 120,284    
Debt securities held-to-maturity 1,510 1,518    
Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 5,960 5,959    
Other        
Financial Assets:        
Debt securities available-for-sale 750 2,250    
Carrying amount        
Financial Assets:        
Cash and due from banks 400,631 419,638    
Money market investments 6,340,786 6,380,948    
Trading account debt securities, excluding derivatives 29,643 32,783    
Debt securities available-for-sale 20,490,212 18,245,903    
Debt securities held-to-maturity 7,535,725 7,752,760    
Equity securities:        
FHLB stock 66,152 55,786    
FRB stock 101,252 100,304    
Other investments 54,987 52,076    
Equity securities, at lower of cost or realizable value 222,391 208,166    
Loans held-for-sale 2,898 5,423    
Loans held in portfolio 37,415,693 36,361,628    
Mortgage servicing rights 103,077 108,103    
Derivatives 24,792 26,023    
Deposits        
Demand deposits 57,618,705 55,871,463    
Time deposits 9,598,786 9,012,882    
Deposits 67,217,491 64,884,345    
Assets sold under agreements to repurchase 56,043 54,833    
Other short-term borrowings 550,000 225,000    
Notes payable:        
FHLB advances 214,200 302,722    
Unsecured senior debt securities 395,865 395,198    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 198,386 198,373    
Notes payable 808,451 896,293    
Derivatives 23,349 22,832    
Carrying amount | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 7,479,657 7,693,418    
Carrying amount | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 48,598 51,865    
Carrying amount | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 1,510 1,518    
Carrying amount | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 5,960 5,959    
Fair Value        
Financial Assets:        
Cash and due from banks 400,631 419,638    
Money market investments 6,340,786 6,380,948    
Trading account debt securities, excluding derivatives 29,643 32,783    
Debt securities available-for-sale 20,490,212 18,245,903    
Debt securities held-to-maturity 7,555,517 7,682,664    
Equity securities:        
FHLB stock 66,152 55,786    
FRB stock 101,252 100,304    
Other investments 55,503 52,573    
Equity securities, at lower of cost or realizable value 222,907 208,663    
Loans held-for-sale 2,898 5,423    
Loans held in portfolio 36,611,781 35,652,539    
Mortgage servicing rights 103,077 108,103    
Derivatives 24,792 26,023    
Deposits        
Demand deposits 57,618,705 55,871,463    
Time deposits 9,378,576 8,795,803    
Deposits 66,997,281 64,667,266    
Assets sold under agreements to repurchase 56,049 54,845    
Other short-term borrowings 550,000 225,000    
Notes payable:        
FHLB advances 211,087 295,023    
Unsecured senior debt securities 416,044 415,148    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 187,515 189,758    
Notes payable 814,646 899,929    
Derivatives 23,349 22,832    
Fair Value | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 7,499,064 7,623,824    
Fair Value | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 49,181 51,577    
Fair Value | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 1,312 1,304    
Fair Value | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 5,960 5,959    
Fair Value | Level 1        
Financial Assets:        
Cash and due from banks 400,631 419,638    
Money market investments 6,330,415 6,371,180    
Trading account debt securities, excluding derivatives 5,813 2,814    
Debt securities available-for-sale 7,908,859 7,512,171    
Debt securities held-to-maturity 0 0    
Equity securities:        
FHLB stock 0 0    
FRB stock 0 0    
Other investments 0 0    
Equity securities, at lower of cost or realizable value 0 0    
Loans held-for-sale 0 0    
Loans held in portfolio 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Deposits        
Demand deposits 0 0    
Time deposits 0 0    
Deposits 0 0    
Assets sold under agreements to repurchase 0 0    
Other short-term borrowings 0 0    
Notes payable:        
FHLB advances 0 0    
Unsecured senior debt securities 0 0    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 0 0    
Notes payable 0 0    
Derivatives 0 0    
Fair Value | Level 1 | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 1 | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 1 | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 1 | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 2        
Financial Assets:        
Cash and due from banks 0 0    
Money market investments 10,371 9,768    
Trading account debt securities, excluding derivatives 23,624 29,752    
Debt securities available-for-sale 12,580,171 10,730,998    
Debt securities held-to-maturity 7,513,156 7,637,953    
Equity securities:        
FHLB stock 66,152 55,786    
FRB stock 101,252 100,304    
Other investments 47,009 45,664    
Equity securities, at lower of cost or realizable value 214,413 201,754    
Loans held-for-sale 2,898 5,423    
Loans held in portfolio 0 0    
Mortgage servicing rights 0 0    
Derivatives 24,792 26,023    
Deposits        
Demand deposits 57,618,705 55,871,463    
Time deposits 9,378,576 8,795,803    
Deposits 66,997,281 64,667,266    
Assets sold under agreements to repurchase 56,049 54,845    
Other short-term borrowings 550,000 225,000    
Notes payable:        
FHLB advances 211,087 295,023    
Unsecured senior debt securities 416,044 415,148    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 187,515 189,758    
Notes payable 814,646 899,929    
Derivatives 23,349 22,832    
Fair Value | Level 2 | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 7,499,064 7,623,824    
Fair Value | Level 2 | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 6,820 6,866    
Fair Value | Level 2 | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 1,312 1,304    
Fair Value | Level 2 | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 5,960 5,959    
Fair Value | Level 3        
Financial Assets:        
Cash and due from banks 0 0    
Money market investments 0 0    
Trading account debt securities, excluding derivatives 206 217    
Debt securities available-for-sale 1,182 2,734    
Debt securities held-to-maturity 42,361 44,711    
Equity securities:        
FHLB stock 0 0    
FRB stock 0 0    
Other investments 8,047 6,528    
Equity securities, at lower of cost or realizable value 8,047 6,528    
Loans held-for-sale 0 0    
Loans held in portfolio 36,611,781 35,652,539    
Mortgage servicing rights 103,077 108,103    
Derivatives 0 0    
Deposits        
Demand deposits 0 0    
Time deposits 0 0    
Deposits 0 0    
Assets sold under agreements to repurchase 0 0    
Other short-term borrowings 0 0    
Notes payable:        
FHLB advances 0 0    
Unsecured senior debt securities 0 0    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 0 0    
Notes payable 0 0    
Derivatives 0 0    
Fair Value | Level 3 | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 3 | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 42,361 44,711    
Fair Value | Level 3 | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | Level 3 | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | NAV        
Financial Assets:        
Cash and due from banks 0 0    
Money market investments 0 0    
Trading account debt securities, excluding derivatives 0 0    
Debt securities available-for-sale 0 0    
Debt securities held-to-maturity 0 0    
Equity securities:        
FHLB stock 0 0    
FRB stock 0 0    
Other investments 447 381    
Equity securities, at lower of cost or realizable value 447 381    
Loans held-for-sale 0 0    
Loans held in portfolio 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Deposits        
Demand deposits 0 0    
Time deposits 0 0    
Deposits 0 0    
Assets sold under agreements to repurchase 0 0    
Other short-term borrowings 0 0    
Notes payable:        
FHLB advances 0 0    
Unsecured senior debt securities 0 0    
Junior subordinated deferrable interest debentures (related to trust preferred securities) 0 0    
Notes payable 0 0    
Derivatives 0 0    
Fair Value | NAV | US Treasury Securities        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | NAV | Obligations of Puerto Rico, States and political subdivisions        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | NAV | Collateralized Mortgage Obligations - Federal agencies        
Financial Assets:        
Debt securities held-to-maturity 0 0    
Fair Value | NAV | Securities in wholly owned statutory business trusts        
Financial Assets:        
Debt securities held-to-maturity $ 0 $ 0