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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investment Securities |  |
Available for sale, Amortized Cost | $ 568,633 | $ 575,288
Available for sale, Gross Unrealized Gains | 2,903 | 1,466
Available for sale, Gross Unrealized Losses | 37,015 | 50,425
Available for sale, Fair Value | 534,521 | 526,329
Held to maturity, Amortized Cost | 73,286 | 78,184
Held to maturity, Gross Unrealized Gains | 4 |
Held to maturity, Gross Unrealized Losses | 9,745 | 13,032
Held to maturity, Fair Value | 63,545 | 65,152
U.S. Treasury securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 132,694 | 176,302
Available for sale, Gross Unrealized Losses | 4,187 | 8,751
Available for sale, Fair Value | 128,507 | 167,551
State and municipals, Taxable |  |
Investment Securities |  |
Available for sale, Amortized Cost | 68,636 | 79,341
Available for sale, Gross Unrealized Gains | 25 | 39
Available for sale, Gross Unrealized Losses | 7,463 | 10,481
Available for sale, Fair Value | 61,198 | 68,899
State and municipals, Tax-exempt |  |
Investment Securities |  |
Available for sale, Amortized Cost | 92,000 | 76,390
Available for sale, Gross Unrealized Gains | 318 | 7
Available for sale, Gross Unrealized Losses | 8,532 | 10,280
Available for sale, Fair Value | 83,786 | 66,117
Held to maturity, Amortized Cost | 10,821 | 10,846
Held to maturity, Gross Unrealized Gains | 4 |
Held to maturity, Gross Unrealized Losses | 655 | 1,103
Held to maturity, Fair Value | 10,170 | 9,743
Residential mortgage-backed securities, U.S. government agencies |  |
Investment Securities |  |
Available for sale, Amortized Cost | 9,962 | 1,403
Available for sale, Gross Unrealized Gains | 147 | 1
Available for sale, Gross Unrealized Losses | 5 | 28
Available for sale, Fair Value | 10,104 | 1,376
Held to maturity, Amortized Cost | 12,639 | 13,847
Held to maturity, Gross Unrealized Losses | 2,088 | 2,643
Held to maturity, Fair Value | 10,551 | 11,204
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available for sale, Amortized Cost | 174,749 | 145,831
Available for sale, Gross Unrealized Gains | 751 | 92
Available for sale, Gross Unrealized Losses | 15,804 | 19,547
Available for sale, Fair Value | 159,696 | 126,376
Held to maturity, Amortized Cost | 49,826 | 53,491
Held to maturity, Gross Unrealized Losses | 7,002 | 9,286
Held to maturity, Fair Value | 42,824 | 44,205
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available for sale, Amortized Cost | 1,915 | 1,927
Available for sale, Gross Unrealized Losses | 27 | 71
Available for sale, Fair Value | 1,888 | 1,856
Private collateralized mortgage obligations |  |
Investment Securities |  |
Available for sale, Amortized Cost | 44,907 | 38,366
Available for sale, Gross Unrealized Gains | 780 | 358
Available for sale, Gross Unrealized Losses | 262 | 152
Available for sale, Fair Value | 45,425 | 38,572
Asset backed securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 19,535 | 23,586
Available for sale, Gross Unrealized Gains | 46 | 66
Available for sale, Gross Unrealized Losses | 298 | 400
Available for sale, Fair Value | 19,283 | 23,252
Corporate debt securities |  |
Investment Securities |  |
Available for sale, Amortized Cost | 23,515 | 31,442
Available for sale, Gross Unrealized Gains | 829 | 894
Available for sale, Gross Unrealized Losses | 437 | 715
Available for sale, Fair Value | 23,907 | 31,621
Negotiable certificates of deposit |  |
Investment Securities |  |
Available for sale, Amortized Cost | 720 | 700
Available for sale, Gross Unrealized Gains | 7 | 9
Available for sale, Fair Value | $ 727 | $ 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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- 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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