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Fair value of financial instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | $ 536,994 | $ 528,759
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 128,507 | 167,551
State and municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 61,198 | 68,899
State and municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 83,786 | 66,117
Residential mortgage-backed securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 10,104 | 1,376
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 159,696 | 126,376
Commercial mortgage-backed securities: U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 1,888 | 1,856
Private collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 45,425 | 38,572
Asset backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 19,283 | 23,252
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 23,907 | 31,621
Negotiable certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 727 | 709
Common equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 2,473 | 2,430
Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 15,708 | 20,537
Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (15,470) | (20,151)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 130,980 | 169,981
Level 1 | U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 128,507 | 167,551
Level 1 | Common equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 2,473 | 2,430
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 404,042 | 354,156
Level 2 | State and municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 61,198 | 68,899
Level 2 | State and municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 83,786 | 66,117
Level 2 | Residential mortgage-backed securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 10,104 | 1,376
Level 2 | Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 159,696 | 126,376
Level 2 | Commercial mortgage-backed securities: U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 1,888 | 1,856
Level 2 | Private collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 45,425 | 38,572
Level 2 | Asset backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 19,283 | 23,252
Level 2 | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 21,935 | 26,999
Level 2 | Negotiable certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 727 | 709
Level 2 | Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 15,708 | 20,537
Level 2 | Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (15,470) | (20,151)
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 1,972 | 4,622
Level 3 | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | $ 1,972 | $ 4,622

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