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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investment Securities
Available for sale, Amortized Cost	$ 546,709	$ 575,288
Available for sale, Gross Unrealized Gains	1,617	1,466
Available for sale, Gross Unrealized Losses	43,145	50,425
Available for sale, Fair Value	505,181	526,329
Held to maturity, Amortized Cost	75,137	78,184
Held to maturity, Gross Unrealized Losses	10,884	13,032
Held to maturity, Fair Value	64,253	65,152
U.S. Treasury securities
Investment Securities
Available for sale, Amortized Cost	150,570	176,302
Available for sale, Gross Unrealized Losses	5,389	8,751
Available for sale, Fair Value	145,181	167,551
State and municipals, Taxable
Investment Securities
Available for sale, Amortized Cost	70,773	79,341
Available for sale, Gross Unrealized Gains	18	39
Available for sale, Gross Unrealized Losses	8,339	10,481
Available for sale, Fair Value	62,452	68,899
State and municipals, Tax-exempt
Investment Securities
Available for sale, Amortized Cost	79,052	76,390
Available for sale, Gross Unrealized Gains	21	7
Available for sale, Gross Unrealized Losses	10,821	10,280
Available for sale, Fair Value	68,252	66,117
Held to maturity, Amortized Cost	10,829	10,846
Held to maturity, Gross Unrealized Losses	903	1,103
Held to maturity, Fair Value	9,926	9,743
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available for sale, Amortized Cost	10,161	1,403
Available for sale, Gross Unrealized Gains	53	1
Available for sale, Gross Unrealized Losses	12	28
Available for sale, Fair Value	10,202	1,376
Held to maturity, Amortized Cost	13,069	13,847
Held to maturity, Gross Unrealized Losses	2,152	2,643
Held to maturity, Fair Value	10,917	11,204
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	151,827	145,831
Available for sale, Gross Unrealized Gains	262	92
Available for sale, Gross Unrealized Losses	17,361	19,547
Available for sale, Fair Value	134,728	126,376
Held to maturity, Amortized Cost	51,239	53,491
Held to maturity, Gross Unrealized Losses	7,829	9,286
Held to maturity, Fair Value	43,410	44,205
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	1,919	1,927
Available for sale, Gross Unrealized Losses	39	71
Available for sale, Fair Value	1,880	1,856
Private collateralized mortgage obligations
Investment Securities
Available for sale, Amortized Cost	36,997	38,366
Available for sale, Gross Unrealized Gains	652	358
Available for sale, Gross Unrealized Losses	214	152
Available for sale, Fair Value	37,435	38,572
Asset backed securities
Investment Securities
Available for sale, Amortized Cost	20,172	23,586
Available for sale, Gross Unrealized Gains	23	66
Available for sale, Gross Unrealized Losses	305	400
Available for sale, Fair Value	19,890	23,252
Corporate debt securities
Investment Securities
Available for sale, Amortized Cost	24,525	31,442
Available for sale, Gross Unrealized Gains	581	894
Available for sale, Gross Unrealized Losses	665	715
Available for sale, Fair Value	24,441	31,621
Negotiable certificates of deposit
Investment Securities
Available for sale, Amortized Cost	713	700
Available for sale, Gross Unrealized Gains	7	9
Available for sale, Fair Value	$ 720	$ 709

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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