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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment Securities
Available-for-sale, Amortized Cost	$ 439,189	$ 450,454
Available-for-sale, Gross Unrealized Losses	53,949	51,527
Available-for-sale	385,240	398,927
Held-to-maturity, Amortized Cost	81,598	84,851
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	13,374	13,154
Held-to-maturity, Fair value	68,224	71,698
U.S. Treasury securities
Investment Securities
Available-for-sale, Amortized Cost	193,092	197,920
Available-for-sale, Gross Unrealized Losses	13,085	13,863
Available-for-sale	180,007	184,057
U.S. Government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	2,409	2,539
Available-for-sale, Gross Unrealized Losses	377	387
Available-for-sale	2,032	2,152
State and municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	67,761	67,831
Available-for-sale, Gross Unrealized Losses	10,924	10,731
Available-for-sale	56,837	57,100
State and municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	74,877	75,742
Available-for-sale, Gross Unrealized Losses	9,873	8,618
Available-for-sale	65,004	67,124
Tax-exempt state and municipals
Investment Securities
Held-to-maturity, Amortized Cost	11,184	11,201
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	873	660
Held-to-maturity, Fair value	10,311	10,542
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	638	758
Available-for-sale, Gross Unrealized Losses	34	34
Available-for-sale	604	724
Held-to-maturity, Amortized Cost	14,554	15,400
Held-to-maturity, Gross Unrealized Losses	2,706	2,653
Held-to-maturity, Fair value	11,848	12,747
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	86,754	89,935
Available-for-sale, Gross Unrealized Losses	19,090	17,264
Available-for-sale	67,664	72,671
Held-to-maturity, Amortized Cost	55,860	58,250
Held-to-maturity, Gross Unrealized Losses	9,795	9,841
Held-to-maturity, Fair value	46,065	48,409
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	9,658	11,729
Available-for-sale, Gross Unrealized Losses	294	360
Available-for-sale	9,364	11,369
Corporate Debt Securities
Investment Securities
Available-for-sale, Amortized Cost	4,000	4,000
Available-for-sale, Gross Unrealized Losses	272	270
Available-for-sale	$ 3,728	$ 3,730

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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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