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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment Securities
Available-for-sale, Amortized Cost	$ 601,270	$ 450,454
Available-for-sale, Gross Unrealized Gains	2,883
Available-for-sale, Gross Unrealized Losses	41,667	51,527
Available-for-sale	562,486	398,927
Held-to-maturity, Amortized Cost	79,861	84,851
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	10,827	13,154
Held-to-maturity, Fair value	69,034	71,698
U.S. Treasury securities
Investment Securities
Available-for-sale, Amortized Cost	189,190	197,920
Available-for-sale, Gross Unrealized Losses	8,375	13,863
Available-for-sale	180,815	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		2,152
State and municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	85,468	67,831
Available-for-sale, Gross Unrealized Gains	109
Available-for-sale, Gross Unrealized Losses	8,186	10,731
Available-for-sale	77,391	57,100
State and municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	76,570	75,742
Available-for-sale, Gross Unrealized Gains	67
Available-for-sale, Gross Unrealized Losses	8,467	8,618
Available-for-sale	68,170	67,124
Held-to-maturity, Amortized Cost	11,175	11,201
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	835	660
Held-to-maturity, Fair value	10,340	10,542
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	1,451	758
Available-for-sale, Gross Unrealized Gains	30
Available-for-sale, Gross Unrealized Losses		34
Available-for-sale	1,481	724
Held-to-maturity, Amortized Cost	14,151	15,400
Held-to-maturity, Gross Unrealized Losses	2,298	2,653
Held-to-maturity, Fair value	11,853	12,747
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	144,244	89,935
Available-for-sale, Gross Unrealized Gains	1,362
Available-for-sale, Gross Unrealized Losses	15,536	17,264
Available-for-sale	130,070	72,671
Held-to-maturity, Amortized Cost	54,535	58,250
Held-to-maturity, Gross Unrealized Losses	7,694	9,841
Held-to-maturity, Fair value	46,841	48,409
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	4,608	11,729
Available-for-sale, Gross Unrealized Losses	60	360
Available-for-sale	4,548	11,369
Private collateralized mortgage obligations
Investment Securities
Available-for-sale, Amortized Cost	42,624
Available-for-sale, Gross Unrealized Gains	635
Available-for-sale, Gross Unrealized Losses	12
Available-for-sale	43,247
Asset backed securities
Investment Securities
Available-for-sale, Amortized Cost	24,115
Available-for-sale, Gross Unrealized Gains	44
Available-for-sale, Gross Unrealized Losses	314
Available-for-sale	23,845
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	32,307	4,000
Available-for-sale, Gross Unrealized Gains	622
Available-for-sale, Gross Unrealized Losses	717	270
Available-for-sale	32,212	$ 3,730
Negotiable certificates of deposit
Investment Securities
Available-for-sale, Amortized Cost	693
Available-for-sale, Gross Unrealized Gains	14
Available-for-sale	$ 707

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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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