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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment Securities
Available for sale, Amortized Cost	$ 575,288	$ 450,454
Available for sale, Gross Unrealized Gains	1,466
Available for sale, Gross Unrealized Losses	50,425	51,527
Available for sale, Fair Value	526,329	398,927
Held to maturity, Amortized Cost	78,184	84,851
Held to maturity, Gross Unrealized Gains		1
Held to maturity, Gross Unrealized Losses	13,032	13,154
Held to maturity, Fair Value	65,152	71,698
U.S. Treasury securities
Investment Securities
Available for sale, Amortized Cost	176,302	197,920
Available for sale, Gross Unrealized Losses	8,751	13,863
Available for sale, Fair Value	167,551	184,057
U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost		2,539
Available for sale, Gross Unrealized Losses		387
Available for sale, Fair Value		2,152
State and municipals, Taxable
Investment Securities
Available for sale, Amortized Cost	79,341	67,831
Available for sale, Gross Unrealized Gains	39
Available for sale, Gross Unrealized Losses	10,481	10,731
Available for sale, Fair Value	68,899	57,100
State and municipals, Tax-exempt
Investment Securities
Available for sale, Amortized Cost	76,390	75,742
Available for sale, Gross Unrealized Gains	7
Available for sale, Gross Unrealized Losses	10,280	8,618
Available for sale, Fair Value	66,117	67,124
Held to maturity, Amortized Cost	10,846	11,201
Held to maturity, Gross Unrealized Gains		1
Held to maturity, Gross Unrealized Losses	1,103	660
Held to maturity, Fair Value	9,743	10,542
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available for sale, Amortized Cost	1,403	758
Available for sale, Gross Unrealized Gains	1
Available for sale, Gross Unrealized Losses	28	34
Available for sale, Fair Value	1,376	724
Held to maturity, Amortized Cost	13,847	15,400
Held to maturity, Gross Unrealized Losses	2,643	2,653
Held to maturity, Fair Value	11,204	12,747
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	145,831	89,935
Available for sale, Gross Unrealized Gains	92
Available for sale, Gross Unrealized Losses	19,547	17,264
Available for sale, Fair Value	126,376	72,671
Held to maturity, Amortized Cost	53,491	58,250
Held to maturity, Gross Unrealized Losses	9,286	9,841
Held to maturity, Fair Value	44,205	48,409
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available for sale, Amortized Cost	1,927	11,729
Available for sale, Gross Unrealized Losses	71	360
Available for sale, Fair Value	1,856	11,369
Private collateralized mortgage obligations
Investment Securities
Available for sale, Amortized Cost	38,366
Available for sale, Gross Unrealized Gains	358
Available for sale, Gross Unrealized Losses	152
Available for sale, Fair Value	38,572
Asset backed securities
Investment Securities
Available for sale, Amortized Cost	23,586
Available for sale, Gross Unrealized Gains	66
Available for sale, Gross Unrealized Losses	400
Available for sale, Fair Value	23,252
Corporate debt securities
Investment Securities
Available for sale, Amortized Cost	31,442	4,000
Available for sale, Gross Unrealized Gains	894
Available for sale, Gross Unrealized Losses	715	270
Available for sale, Fair Value	31,621	$ 3,730
Negotiable certificates of deposit
Investment Securities
Available for sale, Amortized Cost	700
Available for sale, Gross Unrealized Gains	9
Available for sale, Fair Value	$ 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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