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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2026 USD ($) security | Dec. 31, 2025 USD ($) security
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Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 105 | 59
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 197 | 215
Total, Available-for-sale, Number of Securities in a Loss Position | security | 302 | 274
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 131,233 | $ 93,724
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 213,779 | 243,642
Available-for-sale Debt Securities, Total | 345,012 | 337,366
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 2,781 | 943
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 32,148 | 31,382
Available-for-sale Debt Securities Unrealized losses, Total | $ 34,929 | $ 32,325
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 6 |
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 21 | 22
Total, Held to Maturity, Number of Securities in a Loss Position | security | 27 | 22
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 4,012 |
Held-to-maturity Debt (HTM) Securities, 12 months or More | 56,942 | $ 59,243
Held-to-maturity Debt (HTM) Securities, Total | 60,954 | 59,243
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 38 |
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 9,565 | 9,253
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 9,603 | $ 9,253
U.S. Treasury securities |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 5 | 8
Total, Available-for-sale, Number of Securities in a Loss Position | security | 5 | 8
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 18,020 | $ 30,998
Available-for-sale Debt Securities, Total | 18,020 | 30,998
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 1,116 | 1,127
Available-for-sale Debt Securities Unrealized losses, Total | $ 1,116 | $ 1,127
State and municipals, Taxable |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 62 | 64
Total, Available-for-sale, Number of Securities in a Loss Position | security | 62 | 64
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 56,721 | $ 59,002
Available-for-sale Debt Securities, Total | 56,721 | 59,002
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 7,077 | 7,018
Available-for-sale Debt Securities Unrealized losses, Total | $ 7,077 | $ 7,018
State and municipals, Tax-exempt |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 73 | 37
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 82 | 87
Total, Available-for-sale, Number of Securities in a Loss Position | security | 155 | 124
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 63,456 | $ 35,137
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 58,395 | 63,245
Available-for-sale Debt Securities, Total | 121,851 | 98,382
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 2,090 | 519
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 8,257 | 7,379
Available-for-sale Debt Securities Unrealized losses, Total | $ 10,347 | $ 7,898
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 6 |
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 10 | 11
Total, Held to Maturity, Number of Securities in a Loss Position | security | 16 | 11
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 4,012 |
Held-to-maturity Debt (HTM) Securities, 12 months or More | 6,091 | $ 6,641
Held-to-maturity Debt (HTM) Securities, Total | 10,103 | 6,641
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 38 |
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 662 | 620
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 700 | $ 620
Residential mortgage-backed securities, U.S. government agencies |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 5 | 6
Total, Available-for-sale, Number of Securities in a Loss Position | security | 5 | 6
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 20,579 | $ 28,689
Available-for-sale Debt Securities, Total | 20,579 | 28,689
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 360 | 247
Available-for-sale Debt Securities Unrealized losses, Total | $ 360 | $ 247
Held to Maturity, Debt Securities |  |
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 3 | 3
Total, Held to Maturity, Number of Securities in a Loss Position | security | 3 | 3
Held-to-maturity Debt (HTM) Securities, 12 months or More | $ 10,018 | $ 10,314
Held-to-maturity Debt (HTM) Securities, Total | 10,018 | 10,314
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 2,054 | 1,977
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 2,054 | $ 1,977
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 8 | 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 29 | 34
Total, Available-for-sale, Number of Securities in a Loss Position | security | 37 | 37
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 17,634 | $ 8,989
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 66,318 | 71,288
Available-for-sale Debt Securities, Total | 83,952 | 80,277
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 169 | 60
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 14,906 | 15,045
Available-for-sale Debt Securities Unrealized losses, Total | $ 15,075 | $ 15,105
Held to Maturity, Debt Securities |  |
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 8 | 8
Total, Held to Maturity, Number of Securities in a Loss Position | security | 8 | 8
Held-to-maturity Debt (HTM) Securities, 12 months or More | $ 40,833 | $ 42,288
Held-to-maturity Debt (HTM) Securities, Total | 40,833 | 42,288
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 6,849 | 6,656
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 6,849 | $ 6,656
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 1 | 1
Total, Available-for-sale, Number of Securities in a Loss Position | security | 1 | 1
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 1,689 | $ 1,770
Available-for-sale Debt Securities, Total | 1,689 | 1,770
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 19 | 19
Available-for-sale Debt Securities Unrealized losses, Total | $ 19 | $ 19
Asset backed securities |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 3 | 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 2 | 2
Total, Available-for-sale, Number of Securities in a Loss Position | security | 5 | 5
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 4,776 | $ 4,884
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 1,822 | 1,888
Available-for-sale Debt Securities, Total | 6,598 | 6,772
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 22 | 12
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 281 | 288
Available-for-sale Debt Securities Unrealized losses, Total | $ 303 | $ 300
Corporate debt securities |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 2 | 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 5 | 8
Total, Available-for-sale, Number of Securities in a Loss Position | security | 7 | 10
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 1,748 | $ 1,491
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 4,054 | 7,451
Available-for-sale Debt Securities, Total | 5,802 | 8,942
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 2 | 9
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 269 | 313
Available-for-sale Debt Securities Unrealized losses, Total | $ 271 | $ 322
Other |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 14 | 8
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 11 | 11
Total, Available-for-sale, Number of Securities in a Loss Position | security | 25 | 19
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 23,040 | $ 14,534
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 6,760 | 8,000
Available-for-sale Debt Securities, Total | 29,800 | 22,534
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 138 | 96
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 223 | 193
Available-for-sale Debt Securities Unrealized losses, Total | $ 361 | $ 289

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