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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
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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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- 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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