Fair value of financial instruments - Carrying or notional amounts and estimated fair values for financial instruments (Details) - USD ($)
$ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
| Financial Assets: |
|
|
| Cash and due from banks |
$ 384,922
|
$ 402,755
|
| Money market investments |
4,655,699
|
4,626,506
|
| Debt securities available-for-sale |
21,733,269
|
20,574,972
|
| Debt securities held-to-maturity |
6,956,759
|
7,321,717
|
| Equity securities: |
|
|
| Equity securities, at lower of cost or realizable value |
217,167
|
229,848
|
| Loans held in portfolio |
38,465,973
|
38,519,462
|
| Mortgage servicing rights |
94,232
|
96,356
|
| Deposits |
|
|
| Time deposits |
9,745,930
|
9,479,361
|
| Deposits |
67,611,316
|
66,190,093
|
| Assets sold under agreements to repurchase |
34,576
|
39,001
|
| Other short-term borrowings |
350,000
|
650,000
|
| Notes payable: |
|
|
| Notes payable |
734,981
|
759,577
|
| US Treasury Securities |
|
|
| Financial Assets: |
|
|
| Debt securities available-for-sale |
17,038,041
|
15,723,454
|
| Debt securities held-to-maturity |
6,913,002
|
7,268,967
|
| Obligations of Puerto Rico, States and political subdivisions |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
36,306
|
45,295
|
| Collateralized Mortgage Obligations - Federal agencies |
|
|
| Financial Assets: |
|
|
| Debt securities available-for-sale |
95,122
|
100,241
|
| Debt securities held-to-maturity |
1,491
|
1,495
|
| Securities in wholly owned statutory business trusts |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
5,960
|
5,960
|
| Other |
|
|
| Financial Assets: |
|
|
| Debt securities available-for-sale |
750
|
750
|
| Carrying amount |
|
|
| Financial Assets: |
|
|
| Cash and due from banks |
384,922
|
402,755
|
| Money market investments |
4,655,699
|
4,626,506
|
| Trading account debt securities, excluding derivatives |
30,410
|
36,569
|
| Debt securities available-for-sale |
21,733,269
|
20,574,972
|
| Debt securities held-to-maturity |
6,956,759
|
7,321,717
|
| Equity securities: |
|
|
| FHLB stock |
53,796
|
68,422
|
| FRB stock |
103,759
|
102,665
|
| Other investments |
59,611
|
58,761
|
| Equity securities, at lower of cost or realizable value |
217,166
|
229,848
|
| Loans held-for-sale |
5,603
|
9,998
|
| Loans held in portfolio |
38,465,973
|
38,519,462
|
| Mortgage servicing rights |
94,232
|
96,356
|
| Derivatives |
23,956
|
27,913
|
| Deposits |
|
|
| Demand deposits |
57,865,386
|
56,710,732
|
| Time deposits |
9,745,930
|
9,479,361
|
| Deposits |
67,611,316
|
66,190,093
|
| Assets sold under agreements to repurchase |
34,576
|
39,001
|
| Other short-term borrowings |
350,000
|
650,000
|
| Notes payable: |
|
|
| FHLB advances |
139,620
|
164,620
|
| Unsecured senior debt securities |
396,955
|
396,558
|
| Junior subordinated deferrable interest debentures (related to trust preferred securities) |
198,406
|
198,399
|
| Notes payable |
734,981
|
759,577
|
| Derivatives |
22,820
|
25,740
|
| Carrying amount | US Treasury Securities |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
6,913,002
|
7,268,967
|
| Carrying amount | Obligations of Puerto Rico, States and political subdivisions |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
36,306
|
45,295
|
| Carrying amount | Collateralized Mortgage Obligations - Federal agencies |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
1,491
|
1,495
|
| Carrying amount | Securities in wholly owned statutory business trusts |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
5,960
|
5,960
|
| Fair Value |
|
|
| Financial Assets: |
|
|
| Cash and due from banks |
384,922
|
402,755
|
| Money market investments |
4,655,699
|
4,626,506
|
| Trading account debt securities, excluding derivatives |
30,410
|
36,569
|
| Debt securities available-for-sale |
21,733,269
|
20,574,972
|
| Debt securities held-to-maturity |
6,963,223
|
7,363,587
|
| Equity securities: |
|
|
| FHLB stock |
53,796
|
68,422
|
| FRB stock |
103,759
|
102,665
|
| Other investments |
60,141
|
59,301
|
| Equity securities, at lower of cost or realizable value |
217,696
|
230,388
|
| Loans held-for-sale |
5,603
|
9,998
|
| Loans held in portfolio |
37,793,368
|
37,858,044
|
| Mortgage servicing rights |
94,232
|
96,356
|
| Derivatives |
23,956
|
27,913
|
| Deposits |
|
|
| Demand deposits |
57,865,386
|
56,710,732
|
| Time deposits |
9,528,676
|
9,305,980
|
| Deposits |
67,394,062
|
66,016,712
|
| Assets sold under agreements to repurchase |
34,580
|
39,004
|
| Other short-term borrowings |
350,000
|
650,000
|
| Notes payable: |
|
|
| FHLB advances |
138,189
|
163,417
|
| Unsecured senior debt securities |
418,624
|
419,300
|
| Junior subordinated deferrable interest debentures (related to trust preferred securities) |
199,020
|
191,909
|
| Notes payable |
755,833
|
774,626
|
| Derivatives |
22,820
|
25,740
|
| Fair Value | US Treasury Securities |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
6,918,757
|
7,309,991
|
| Fair Value | Obligations of Puerto Rico, States and political subdivisions |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
37,205
|
46,330
|
| Fair Value | Collateralized Mortgage Obligations - Federal agencies |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
1,301
|
1,306
|
| Fair Value | Securities in wholly owned statutory business trusts |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
5,960
|
5,960
|
| Fair Value | Level 1 |
|
|
| Financial Assets: |
|
|
| Cash and due from banks |
384,922
|
402,755
|
| Money market investments |
4,645,897
|
4,616,272
|
| Trading account debt securities, excluding derivatives |
3,790
|
12,450
|
| Debt securities available-for-sale |
6,996,073
|
6,576,313
|
| 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 |
9,802
|
10,234
|
| Trading account debt securities, excluding derivatives |
26,440
|
23,936
|
| Debt securities available-for-sale |
14,736,063
|
13,997,504
|
| Debt securities held-to-maturity |
6,926,018
|
7,324,023
|
| Equity securities: |
|
|
| FHLB stock |
53,796
|
68,422
|
| FRB stock |
103,759
|
102,665
|
| Other investments |
51,198
|
50,632
|
| Equity securities, at lower of cost or realizable value |
208,753
|
221,719
|
| Loans held-for-sale |
5,603
|
9,998
|
| Loans held in portfolio |
0
|
0
|
| Mortgage servicing rights |
0
|
0
|
| Derivatives |
23,956
|
27,913
|
| Deposits |
|
|
| Demand deposits |
57,865,386
|
56,710,732
|
| Time deposits |
9,528,676
|
9,305,980
|
| Deposits |
67,394,062
|
66,016,712
|
| Assets sold under agreements to repurchase |
34,580
|
39,004
|
| Other short-term borrowings |
350,000
|
650,000
|
| Notes payable: |
|
|
| FHLB advances |
138,189
|
163,417
|
| Unsecured senior debt securities |
418,624
|
419,300
|
| Junior subordinated deferrable interest debentures (related to trust preferred securities) |
199,020
|
191,909
|
| Notes payable |
755,833
|
774,626
|
| Derivatives |
22,820
|
25,740
|
| Fair Value | Level 2 | US Treasury Securities |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
6,918,757
|
7,309,991
|
| Fair Value | Level 2 | Obligations of Puerto Rico, States and political subdivisions |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
0
|
6,766
|
| Fair Value | Level 2 | Collateralized Mortgage Obligations - Federal agencies |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
1,301
|
1,306
|
| Fair Value | Level 2 | Securities in wholly owned statutory business trusts |
|
|
| Financial Assets: |
|
|
| Debt securities held-to-maturity |
5,960
|
5,960
|
| Fair Value | Level 3 |
|
|
| Financial Assets: |
|
|
| Cash and due from banks |
0
|
0
|
| Money market investments |
0
|
0
|
| Trading account debt securities, excluding derivatives |
180
|
183
|
| Debt securities available-for-sale |
1,133
|
1,155
|
| Debt securities held-to-maturity |
37,205
|
39,564
|
| Equity securities: |
|
|
| FHLB stock |
0
|
0
|
| FRB stock |
0
|
0
|
| Other investments |
7,808
|
7,817
|
| Equity securities, at lower of cost or realizable value |
7,808
|
7,817
|
| Loans held-for-sale |
0
|
0
|
| Loans held in portfolio |
37,793,368
|
37,858,044
|
| Mortgage servicing rights |
94,232
|
96,356
|
| 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 |
37,205
|
39,564
|
| 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 |
1,135
|
852
|
| Equity securities, at lower of cost or realizable value |
1,135
|
852
|
| 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
|