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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
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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