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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) 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 |  | 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 247 | 248
Total, Available-for-sale, Number of Securities in a Loss Position | security | 247 | 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value |  | $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 385,240 | 397,201
Available-for-sale Debt Securities, Total | 385,240 | 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months |  | 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 53,949 | 51,516
Available-for-sale Debt Securities Unrealized losses, Total | $ 53,949 | $ 51,527
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 5 | 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 24 | 22
Total, Held to Maturity, Number of Securities in a Loss Position | security | 29 | 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 2,883 | $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More | 65,341 | 67,365
Held-to-maturity Debt (HTM) Securities, Total | 68,224 | 68,803
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 11 | 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 13,363 | 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 13,374 | $ 13,154
U.S. Treasury securities |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 42 | 43
Total, Available-for-sale, Number of Securities in a Loss Position | security | 42 | 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 180,007 | $ 184,057
Available-for-sale Debt Securities, Total | 180,007 | 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 13,085 | 13,863
Available-for-sale Debt Securities Unrealized losses, Total | $ 13,085 | $ 13,863
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 | 2 | 2
Total, Available-for-sale, Number of Securities in a Loss Position | security | 2 | 2
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 2,032 | $ 2,152
Available-for-sale Debt Securities, Total | 2,032 | 2,152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 377 | 387
Available-for-sale Debt Securities Unrealized losses, Total | $ 377 | $ 387
State and municipals, Taxable |  |
Available-for-sale Debt Securities |  |
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security |  | 1
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 66 | 65
Total, Available-for-sale, Number of Securities in a Loss Position | security | 66 | 66
Available-for-sale Debt Securities, Less than 12 Months, Fair Value |  | $ 995
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 56,837 | 56,105
Available-for-sale Debt Securities, Total | 56,837 | 57,100
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months |  | 6
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 10,924 | 10,725
Available-for-sale Debt Securities Unrealized losses, Total | $ 10,924 | $ 10,731
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 |  | 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 94 | 93
Total, Available-for-sale, Number of Securities in a Loss Position | security | 94 | 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value |  | $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 65,004 | 66,393
Available-for-sale Debt Securities, Total | 65,004 | 66,968
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months |  | 5
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 9,873 | 8,613
Available-for-sale Debt Securities Unrealized losses, Total | $ 9,873 | $ 8,618
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 5 | 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 12 | 10
Total, Held to Maturity, Number of Securities in a Loss Position | security | 17 | 12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 2,883 | $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More | 7,428 | 6,209
Held-to-maturity Debt (HTM) Securities, Total | 10,311 | 7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 11 | 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 862 | 624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 873 | $ 660
Residential mortgage-backed securities, U.S. government agencies |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 3 | 3
Total, Available-for-sale, Number of Securities in a Loss Position | security | 3 | 3
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 604 | $ 724
Available-for-sale Debt Securities, Total | 604 | 724
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 34 | 34
Available-for-sale Debt Securities Unrealized losses, Total | $ 34 | $ 34
Held to Maturity, Debt Securities |  |
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 4 | 4
Total, Held to Maturity, Number of Securities in a Loss Position | security | 4 | 4
Held-to-maturity Debt (HTM) Securities, 12 months or More | $ 11,848 | $ 12,747
Held-to-maturity Debt (HTM) Securities, Total | 11,848 | 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 2,706 | 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 2,706 | $ 2,653
Residential 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 | 30 | 32
Total, Available-for-sale, Number of Securities in a Loss Position | security | 30 | 32
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 67,664 | $ 72,671
Available-for-sale Debt Securities, Total | 67,664 | 72,671
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 19,090 | 17,264
Available-for-sale Debt Securities Unrealized losses, Total | $ 19,090 | $ 17,264
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 | $ 46,065 | $ 48,409
Held-to-maturity Debt (HTM) Securities, Total | 46,065 | 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 9,795 | 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 9,795 | $ 9,841
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 | 4 | 4
Total, Available-for-sale, Number of Securities in a Loss Position | security | 4 | 4
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 9,364 | $ 11,369
Available-for-sale Debt Securities, Total | 9,364 | 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 294 | 360
Available-for-sale Debt Securities Unrealized losses, Total | $ 294 | $ 360
Corporate Debt Securities |  |
Available-for-sale Debt Securities |  |
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 6 | 6
Total, Available-for-sale, Number of Securities in a Loss Position | security | 6 | 6
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 3,728 | $ 3,730
Available-for-sale Debt Securities, Total | 3,728 | 3,730
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 272 | 270
Available-for-sale Debt Securities Unrealized losses, Total | $ 272 | $ 270

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