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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investment Securities
Available for sale, Amortized Cost	$ 568,633	$ 575,288
Available for sale, Gross Unrealized Gains	2,903	1,466
Available for sale, Gross Unrealized Losses	37,015	50,425
Available for sale, Fair Value	534,521	526,329
Held to maturity, Amortized Cost	73,286	78,184
Held to maturity, Gross Unrealized Gains	4
Held to maturity, Gross Unrealized Losses	9,745	13,032
Held to maturity, Fair Value	63,545	65,152
U.S. Treasury securities
Investment Securities
Available for sale, Amortized Cost	132,694	176,302
Available for sale, Gross Unrealized Losses	4,187	8,751
Available for sale, Fair Value	128,507	167,551
State and municipals, Taxable
Investment Securities
Available for sale, Amortized Cost	68,636	79,341
Available for sale, Gross Unrealized Gains	25	39
Available for sale, Gross Unrealized Losses	7,463	10,481
Available for sale, Fair Value	61,198	68,899
State and municipals, Tax-exempt
Investment Securities
Available for sale, Amortized Cost	92,000	76,390
Available for sale, Gross Unrealized Gains	318	7
Available for sale, Gross Unrealized Losses	8,532	10,280
Available for sale, Fair Value	83,786	66,117
Held to maturity, Amortized Cost	10,821	10,846
Held to maturity, Gross Unrealized Gains	4
Held to maturity, Gross Unrealized Losses	655	1,103
Held to maturity, Fair Value	10,170	9,743
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available for sale, Amortized Cost	9,962	1,403
Available for sale, Gross Unrealized Gains	147	1
Available for sale, Gross Unrealized Losses	5	28
Available for sale, Fair Value	10,104	1,376
Held to maturity, Amortized Cost	12,639	13,847
Held to maturity, Gross Unrealized Losses	2,088	2,643
Held to maturity, Fair Value	10,551	11,204
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	174,749	145,831
Available for sale, Gross Unrealized Gains	751	92
Available for sale, Gross Unrealized Losses	15,804	19,547
Available for sale, Fair Value	159,696	126,376
Held to maturity, Amortized Cost	49,826	53,491
Held to maturity, Gross Unrealized Losses	7,002	9,286
Held to maturity, Fair Value	42,824	44,205
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	1,915	1,927
Available for sale, Gross Unrealized Losses	27	71
Available for sale, Fair Value	1,888	1,856
Private collateralized mortgage obligations
Investment Securities
Available for sale, Amortized Cost	44,907	38,366
Available for sale, Gross Unrealized Gains	780	358
Available for sale, Gross Unrealized Losses	262	152
Available for sale, Fair Value	45,425	38,572
Asset backed securities
Investment Securities
Available for sale, Amortized Cost	19,535	23,586
Available for sale, Gross Unrealized Gains	46	66
Available for sale, Gross Unrealized Losses	298	400
Available for sale, Fair Value	19,283	23,252
Corporate debt securities
Investment Securities
Available for sale, Amortized Cost	23,515	31,442
Available for sale, Gross Unrealized Gains	829	894
Available for sale, Gross Unrealized Losses	437	715
Available for sale, Fair Value	23,907	31,621
Negotiable certificates of deposit
Investment Securities
Available for sale, Amortized Cost	720	700
Available for sale, Gross Unrealized Gains	7	9
Available for sale, Fair Value	$ 727	$ 709

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- Definition

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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Amount, before tax, of unrealized loss 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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