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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Investment Securities |  |
Available for sale, Amortized Cost | $ 502,298 | $ 541,707
Available for sale, Gross Unrealized Gains | 1,892 | 3,181
Available for sale, Gross Unrealized Losses | 34,929 | 32,325
Available for sale, Fair Value | 469,261 | 512,563
Held to maturity, Amortized Cost | 70,557 | 72,047
Held to maturity, Gross Unrealized Gains |  | 4
Held to maturity, Gross Unrealized Losses | 9,603 | 9,253
Held to maturity, Fair Value | 60,954 | 62,798
U.S. Treasury securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 19,136 | 32,125
Available for sale, Gross Unrealized Losses | 1,116 | 1,127
Available for sale, Fair Value | 18,020 | 30,998
State and municipals, Taxable |  |
Investment Securities |  |
Available for sale, Amortized Cost | 65,273 | 68,618
Available for sale, Gross Unrealized Gains | 18 | 22
Available for sale, Gross Unrealized Losses | 7,077 | 7,018
Available for sale, Fair Value | 58,214 | 61,622
State and municipals, Tax-exempt |  |
Investment Securities |  |
Available for sale, Amortized Cost | 149,342 | 132,586
Available for sale, Gross Unrealized Gains | 173 | 429
Available for sale, Gross Unrealized Losses | 10,347 | 7,898
Available for sale, Fair Value | 139,168 | 125,117
Held to maturity, Amortized Cost | 10,803 | 10,812
Held to maturity, Gross Unrealized Gains |  | 4
Held to maturity, Gross Unrealized Losses | 700 | 620
Held to maturity, Fair Value | 10,103 | 10,196
Residential mortgage-backed securities, U.S. government agencies |  |
Investment Securities |  |
Available for sale, Amortized Cost | 20,978 | 42,801
Available for sale, Gross Unrealized Gains |  | 145
Available for sale, Gross Unrealized Losses | 360 | 247
Available for sale, Fair Value | 20,618 | 42,699
Held to maturity, Amortized Cost | 12,072 | 12,291
Held to maturity, Gross Unrealized Losses | 2,054 | 1,977
Held to maturity, Fair Value | 10,018 | 10,314
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available for sale, Amortized Cost | 159,987 | 174,223
Available for sale, Gross Unrealized Gains | 431 | 962
Available for sale, Gross Unrealized Losses | 15,075 | 15,105
Available for sale, Fair Value | 145,343 | 160,080
Held to maturity, Amortized Cost | 47,682 | 48,944
Held to maturity, Gross Unrealized Losses | 6,849 | 6,656
Held to maturity, Fair Value | 40,833 | 42,288
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available for sale, Amortized Cost | 1,708 | 1,789
Available for sale, Gross Unrealized Losses | 19 | 19
Available for sale, Fair Value | 1,689 | 1,770
Private collateralized mortgage obligations |  |
Investment Securities |  |
Available for sale, Amortized Cost | 48,230 | 48,007
Available for sale, Gross Unrealized Gains | 594 | 766
Available for sale, Gross Unrealized Losses | 361 | 289
Available for sale, Fair Value | 48,463 | 48,484
Asset backed securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 15,647 | 16,544
Available for sale, Gross Unrealized Gains | 22 | 23
Available for sale, Gross Unrealized Losses | 303 | 300
Available for sale, Fair Value | 15,366 | 16,267
Corporate debt securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 21,264 | 24,287
Available for sale, Gross Unrealized Gains | 651 | 829
Available for sale, Gross Unrealized Losses | 271 | 322
Available for sale, Fair Value | 21,644 | 24,794
Negotiable certificates of deposit |  |
Investment Securities |  |
Available for sale, Amortized Cost | 733 | 727
Available for sale, Gross Unrealized Gains | 3 | 5
Available for sale, Fair Value | $ 736 | $ 732

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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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