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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 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 | 2 | 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 248 | 248
Total, Available-for-sale, Number of Securities in a Loss Position | security | 250 | 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 578 | $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 393,679 | 397,201
Available-for-sale Debt Securities, Total | 394,257 | 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 2 | 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 53,966 | 51,516
Available-for-sale Debt Securities Unrealized losses, Total | $ 53,968 | $ 51,527
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 2 | 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 23 | 22
Total, Held to Maturity, Number of Securities in a Loss Position | security | 25 | 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 1,168 | $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More | 66,135 | 67,365
Held-to-maturity Debt (HTM) Securities, Total | 67,303 | 68,803
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 17 | 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 13,301 | 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 13,318 | $ 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 | 43 | 43
Total, Available-for-sale, Number of Securities in a Loss Position | security | 43 | 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 183,899 | $ 184,057
Available-for-sale Debt Securities, Total | 183,899 | 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 14,107 | 13,863
Available-for-sale Debt Securities Unrealized losses, Total | $ 14,107 | $ 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 | $ 2,036 | $ 2,152
Available-for-sale Debt Securities, Total | 2,036 | 2,152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 376 | 387
Available-for-sale Debt Securities Unrealized losses, Total | $ 376 | $ 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 | $ 56,913 | 56,105
Available-for-sale Debt Securities, Total | 56,913 | 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 | 10,883 | 10,725
Available-for-sale Debt Securities Unrealized losses, Total | $ 10,883 | $ 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 | 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security | 93 | 93
Total, Available-for-sale, Number of Securities in a Loss Position | security | 95 | 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value | $ 578 | $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value | 65,825 | 66,393
Available-for-sale Debt Securities, Total | 66,403 | 66,968
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months | 2 | 5
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 8,981 | 8,613
Available-for-sale Debt Securities Unrealized losses, Total | $ 8,983 | $ 8,618
Held to Maturity, Debt Securities |  |
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security | 2 | 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security | 11 | 10
Total, Held to Maturity, Number of Securities in a Loss Position | security | 13 | 12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months | $ 1,168 | $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More | 6,630 | 6,209
Held-to-maturity Debt (HTM) Securities, Total | 7,798 | 7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months | 17 | 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 692 | 624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 709 | $ 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 | $ 665 | $ 724
Available-for-sale Debt Securities, Total | 665 | 724
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 37 | 34
Available-for-sale Debt Securities Unrealized losses, Total | $ 37 | $ 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 | $ 12,284 | $ 12,747
Held-to-maturity Debt (HTM) Securities, Total | 12,284 | 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 2,644 | 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 2,644 | $ 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 | 31 | 32
Total, Available-for-sale, Number of Securities in a Loss Position | security | 31 | 32
Available-for-sale Debt Securities, 12 Months or More, Fair Value | $ 69,499 | $ 72,671
Available-for-sale Debt Securities, Total | 69,499 | 72,671
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 18,989 | 17,264
Available-for-sale Debt Securities Unrealized losses, Total | $ 18,989 | $ 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 | $ 47,221 | $ 48,409
Held-to-maturity Debt (HTM) Securities, Total | 47,221 | 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More | 9,965 | 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total | $ 9,965 | $ 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 | $ 11,099 | $ 11,369
Available-for-sale Debt Securities, Total | 11,099 | 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 336 | 360
Available-for-sale Debt Securities Unrealized losses, Total | $ 336 | $ 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 | $ 3,743 | $ 3,730
Available-for-sale Debt Securities, Total | 3,743 | 3,730
Available-for-sale Debt Securities Unrealized losses, 12 Months or More | 257 | 270
Available-for-sale Debt Securities Unrealized losses, Total | $ 257 | $ 270

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