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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investment Securities
Available for sale, Amortized Cost	$ 546,430	$ 575,288
Available for sale, Gross Unrealized Gains	2,035	1,466
Available for sale, Gross Unrealized Losses	45,422	50,425
Available for sale, Fair Value	503,043	526,329
Held to maturity, Amortized Cost	76,689	78,184
Held to maturity, Gross Unrealized Losses	11,914	13,032
Held to maturity, Fair Value	64,775	65,152
U.S. Treasury securities
Investment Securities
Available for sale, Amortized Cost	164,435	176,302
Available for sale, Gross Unrealized Losses	6,761	8,751
Available for sale, Fair Value	157,674	167,551
State and municipals, Taxable
Investment Securities
Available for sale, Amortized Cost	74,557	79,341
Available for sale, Gross Unrealized Gains	25	39
Available for sale, Gross Unrealized Losses	9,019	10,481
Available for sale, Fair Value	65,563	68,899
State and municipals, Tax-exempt
Investment Securities
Available for sale, Amortized Cost	76,091	76,390
Available for sale, Gross Unrealized Gains	7	7
Available for sale, Gross Unrealized Losses	10,969	10,280
Available for sale, Fair Value	65,129	66,117
Held to maturity, Amortized Cost	10,838	10,846
Held to maturity, Gross Unrealized Losses	1,119	1,103
Held to maturity, Fair Value	9,719	9,743
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available for sale, Amortized Cost	1,417	1,403
Available for sale, Gross Unrealized Gains	1	1
Available for sale, Gross Unrealized Losses	7	28
Available for sale, Fair Value	1,411	1,376
Held to maturity, Amortized Cost	13,473	13,847
Held to maturity, Gross Unrealized Losses	2,334	2,643
Held to maturity, Fair Value	11,139	11,204
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	143,141	145,831
Available for sale, Gross Unrealized Gains	258	92
Available for sale, Gross Unrealized Losses	17,527	19,547
Available for sale, Fair Value	125,872	126,376
Held to maturity, Amortized Cost	52,378	53,491
Held to maturity, Gross Unrealized Losses	8,461	9,286
Held to maturity, Fair Value	43,917	44,205
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	1,923	1,927
Available for sale, Gross Unrealized Losses	48	71
Available for sale, Fair Value	1,875	1,856
Private collateralized mortgage obligations
Investment Securities
Available for sale, Amortized Cost	34,344	38,366
Available for sale, Gross Unrealized Gains	585	358
Available for sale, Gross Unrealized Losses	127	152
Available for sale, Fair Value	34,802	38,572
Asset backed securities
Investment Securities
Available for sale, Amortized Cost	21,071	23,586
Available for sale, Gross Unrealized Gains	40	66
Available for sale, Gross Unrealized Losses	325	400
Available for sale, Fair Value	20,786	23,252
Corporate debt securities
Investment Securities
Available for sale, Amortized Cost	28,745	31,442
Available for sale, Gross Unrealized Gains	1,111	894
Available for sale, Gross Unrealized Losses	639	715
Available for sale, Fair Value	29,217	31,621
Negotiable certificates of deposit
Investment Securities
Available for sale, Amortized Cost	706	700
Available for sale, Gross Unrealized Gains	8	9
Available for sale, Fair Value	$ 714	$ 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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