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Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Securities |
Summary of available for sale debt securities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. Treasury securities | ​ | $ | 4,992 | ​ | $ | — | ​ | $ | (141) | ​ | $ | 4,851 | ​
U.S. government agencies and corporations | ​ | ​ | 65,072 | ​ | ​ | — | ​ | ​ | (5,501) | ​ | ​ | 59,571 | ​
Mortgage-backed securities | ​ |  | 211,518 | ​ |  | 1,705 | ​ |  | (8,763) | ​ |  | 204,460 | ​
Obligations of states and political subdivisions | ​ |  | 151,070 | ​ |  | 900 | ​ | ​ | (3,402) | ​ |  | 148,568 | ​
Corporate and other debt securities | ​ | ​ | 22,750 | ​ | ​ | 113 | ​ | ​ | (1,279) | ​ | ​ | 21,584 | ​
Total | ​ | $ | 455,402 | ​ | $ | 2,718 | ​ | $ | (19,086) | ​ | $ | 439,034 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. Treasury securities | ​ | $ | 10,985 | ​ | $ | — | ​ | $ | (285) | ​ | $ | 10,700 | ​
U.S. government agencies and corporations | ​ | ​ | 68,772 | ​ | ​ | — | ​ | ​ | (8,113) | ​ | ​ | 60,659 | ​
Mortgage-backed securities | ​ |  | 197,923 | ​ |  | 69 | ​ |  | (15,556) | ​ |  | 182,436 | ​
Obligations of states and political subdivisions | ​ |  | 147,532 | ​ |  | 691 | ​ |  | (4,613) | ​ |  | 143,610 | ​
Corporate and other debt securities | ​ |  | 23,404 | ​ |  | 29 | ​ |  | (2,213) | ​ |  | 21,220 | ​
Total | ​ | $ | 448,616 | ​ | $ | 789 | ​ | $ | (30,780) | ​ | $ | 418,625 | ​
Schedule of amortized cost and estimated fair value of securities, by the earlier of contractual maturity or expected maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 |
​ |  | Amortized |  | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Fair Value |
Due in one year or less | ​ | $ | 80,094 | ​ | $ | 78,338 | ​
Due after one year through five years | ​ |  | 191,949 | ​ |  | 183,995 | ​
Due after five years through ten years | ​ |  | 143,936 | ​ |  | 138,453 | ​
Due after ten years | ​ |  | 39,423 | ​ |  | 38,248 | ​
Total | ​ | $ | 455,402 | ​ | $ | 439,034 | ​
Schedule of gross realized gains and losses and the proceeds | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
(Dollars in thousands) |  | 2025 |  | 2024 |  | 2025 | ​ | 2024
Realized gains from sales, maturities and calls of securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Gross realized losses | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Net realized losses | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Proceeds from sales, maturities, calls and paydowns of securities | ​ | $ | 19,234 | ​ | $ | 16,344 | ​ | $ | 50,567 | ​ | $ | 89,240
Schedule of securities in an unrealized loss position | Securities in an unrealized loss position at September 30, 2025, by duration of the period of the unrealized loss, are shown below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
(Dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss |
U.S. Treasury securities | ​ | $ | — | ​ | $ | — | ​ | $ | 4,851 | ​ | $ | 141 | ​ | $ | 4,851 | ​ | $ | 141 | ​
U.S. government agencies and corporations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 59,571 | ​ | ​ | 5,501 | ​ | ​ | 59,571 | ​ | ​ | 5,501 | ​
Mortgage-backed securities | ​ |  | 590 | ​ | ​ | 29 | ​ |  | 120,220 | ​ |  | 8,734 | ​ |  | 120,810 | ​ |  | 8,763 | ​
Obligations of states and political subdivisions | ​ |  | 16,827 | ​ | ​ | 246 | ​ |  | 70,393 | ​ |  | 3,156 | ​ |  | 87,220 | ​ |  | 3,402 | ​
Corporate and other debt securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,971 | ​ | ​ | 1,279 | ​ | ​ | 16,971 | ​ | ​ | 1,279 | ​
Total | ​ | $ | 17,417 | ​ | $ | 275 | ​ | $ | 272,006 | ​ | $ | 18,811 | ​ | $ | 289,423 | ​ | $ | 19,086 | ​
Securities in an unrealized loss position at December 31, 2024, by duration of the period of the unrealized loss, are shown below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
(Dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss |
U.S. Treasury securities | ​ | $ | — | ​ | $ | — | ​ | $ | 10,700 | ​ | $ | 285 | ​ | $ | 10,700 | ​ | $ | 285 | ​
U.S. government agencies and corporations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 60,659 | ​ | ​ | 8,113 | ​ | ​ | 60,659 | ​ | ​ | 8,113 | ​
Mortgage-backed securities | ​ | ​ | 53,734 | ​ | ​ | 1,253 | ​ |  | 123,307 | ​ |  | 14,303 | ​ |  | 177,041 | ​ |  | 15,556 | ​
Obligations of states and political subdivisions | ​ | ​ | 31,981 | ​ | ​ | 412 | ​ | ​ | 66,743 | ​ |  | 4,201 | ​ | ​ | 98,724 | ​ | ​ | 4,613 | ​
Corporate and other debt securities | ​ |  | 474 | ​ | ​ | 26 | ​ |  | 19,717 | ​ | ​ | 2,187 | ​ |  | 20,191 | ​ |  | 2,213 | ​
Total | ​ | $ | 86,189 | ​ | $ | 1,691 | ​ | $ | 281,126 | ​ | $ | 29,089 | ​ | $ | 367,315 | ​ | $ | 30,780 | ​

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