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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
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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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- 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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