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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 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 | 88 | 59
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 190 | 215
Total, Available-for-sale, Number of Securities in a Loss Position | security | 278 | 274
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 133,950 | $ 93,724
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 208,627 | 243,642
Available-for-sale Debt Securities, Total | 342,577 | 337,366
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 1,534 | 943
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 31,294 | 31,382
Available-for-sale Debt Securities Unrealized losses, Total | $ 32,828 | $ 32,325
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 2 |
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 | 23 | 22
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 1,467 |
Held-to-maturity Debt (HTM) Securities, 12 months or More | 55,269 | $ 59,243
Held-to-maturity Debt (HTM) Securities, Total | 56,736 | 59,243
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 9 |
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 9,404 | 9,253
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 9,413 | $ 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 | $ 18,003 | $ 30,998
Available-for-sale Debt Securities, Total | 18,003 | 30,998
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 1,120 | 1,127
Available-for-sale Debt Securities Unrealized losses, Total | $ 1,120 | $ 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 | 61 | 64
Total, Available-for-sale, Number of Securities in a Loss Position | security | 61 | 64
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 55,979 | $ 59,002
Available-for-sale Debt Securities, Total | 55,979 | 59,002
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 7,348 | 7,018
Available-for-sale Debt Securities Unrealized losses, Total | $ 7,348 | $ 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 | 30 | 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 | 112 | 124
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 26,044 | $ 35,137
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 59,346 | 63,245
Available-for-sale Debt Securities, Total | 85,390 | 98,382
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 352 | 519
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 7,128 | 7,379
Available-for-sale Debt Securities Unrealized losses, Total | $ 7,480 | $ 7,898
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 2 |
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 | 12 | 11
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 1,467 |
Held-to-maturity Debt (HTM) Securities, 12 months or More | 6,166 | $ 6,641
Held-to-maturity Debt (HTM) Securities, Total | 7,633 | 6,641
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 9 |
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 578 | 620
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 587 | $ 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 | $ 20,020 | $ 28,689
Available-for-sale Debt Securities, Total | 20,020 | 28,689
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 456 | 247
Available-for-sale Debt Securities Unrealized losses, Total | $ 456 | $ 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 | $ 9,582 | $ 10,314
Held-to-maturity Debt (HTM) Securities, Total | 9,582 | 10,314
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 2,011 | 1,977
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 2,011 | $ 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 | 28 | 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 28 | 34
Total, Available-for-sale, Number of Securities in a Loss Position | security | 56 | 37
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 57,863 | $ 8,989
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 60,672 | 71,288
Available-for-sale Debt Securities, Total | 118,535 | 80,277
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 528 | 60
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 14,932 | 15,045
Available-for-sale Debt Securities Unrealized losses, Total | $ 15,460 | $ 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 | $ 39,521 | $ 42,288
Held-to-maturity Debt (HTM) Securities, Total | 39,521 | 42,288
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 6,815 | 6,656
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 6,815 | $ 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 | $ 1,658 | $ 1,770
Available-for-sale Debt Securities, Total | 1,658 | 1,770
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 21 | 19
Available-for-sale Debt Securities Unrealized losses, Total | $ 21 | $ 19
Private collateralized mortgage obligations |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security | 20 | 8
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 9 | 11
Total, Available-for-sale, Number of Securities in a Loss Position | security | 29 | 19
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 23,581 | $ 14,534
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 8,966 | 8,000
Available-for-sale Debt Securities, Total | 32,547 | 22,534
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 167 | 96
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 317 | 193
Available-for-sale Debt Securities Unrealized losses, Total | $ 484 | $ 289
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 | $ 4,704 | $ 4,884
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 1,813 | 1,888
Available-for-sale Debt Securities, Total | 6,517 | 6,772
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 18 | 12
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 288 | 288
Available-for-sale Debt Securities Unrealized losses, Total | $ 306 | $ 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 | 2 | 8
Total, Available-for-sale, Number of Securities in a Loss Position | security | 4 | 10
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 1,738 | $ 1,491
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 2,190 | 7,451
Available-for-sale Debt Securities, Total | 3,928 | 8,942
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 13 | 9
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 140 | 313
Available-for-sale Debt Securities Unrealized losses, Total | $ 153 | $ 322

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