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Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Securities |
Summary of available for sale debt securities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. Treasury securities | ​ | $ | 45,883 | ​ | $ | — | ​ | $ | (780) | ​ | $ | 45,103 | ​
U.S. government agencies and corporations | ​ | ​ | 96,407 | ​ | ​ | — | ​ | ​ | (9,313) | ​ | ​ | 87,094 | ​
Mortgage-backed securities | ​ |  | 177,734 | ​ |  | 185 | ​ |  | (16,223) | ​ |  | 161,696 | ​
Obligations of states and political subdivisions | ​ |  | 148,875 | ​ |  | 2,280 | ​ | ​ | (4,044) | ​ |  | 147,111 | ​
Corporate and other debt securities | ​ | ​ | 25,193 | ​ | ​ | — | ​ | ​ | (3,753) | ​ | ​ | 21,440 | ​
​ | ​ | $ | 494,092 | ​ | $ | 2,465 | ​ | $ | (34,113) | ​ | $ | 462,444 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. Treasury securities | ​ | $ | 60,886 | ​ | $ | — | ​ | $ | (2,053) | ​ | $ | 58,833 | ​
U.S. government agencies and corporations | ​ | ​ | 143,241 | ​ | ​ | — | ​ | ​ | (12,967) | ​ | ​ | 130,274 | ​
Mortgage-backed securities | ​ |  | 200,393 | ​ |  | 65 | ​ |  | (20,540) | ​ |  | 179,918 | ​
Obligations of states and political subdivisions | ​ |  | 127,317 | ​ |  | 300 | ​ |  | (6,790) | ​ |  | 120,827 | ​
Corporate and other debt securities | ​ |  | 25,291 | ​ |  | — | ​ |  | (2,552) | ​ |  | 22,739 | ​
​ | ​ | $ | 557,128 | ​ | $ | 365 | ​ | $ | (44,902) | ​ | $ | 512,591 | ​
Schedule of amortized cost and estimated fair value of securities, by the earlier of contractual maturity or expected maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 |
​ |  | Amortized |  | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Fair Value |
Due in one year or less | ​ | $ | 113,791 | ​ | $ | 110,669 | ​
Due after one year through five years | ​ |  | 181,243 | ​ |  | 166,910 | ​
Due after five years through ten years | ​ |  | 118,265 | ​ |  | 105,879 | ​
Due after ten years | ​ |  | 80,793 | ​ |  | 78,986 | ​
​ | ​ | $ | 494,092 | ​ | $ | 462,444 | ​
Schedule of gross realized gains and losses and the proceeds | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021
Realized gains from sales, maturities and calls of securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains | ​ | $ | — | ​ | $ | — | ​ | $ | 42
Gross realized losses | ​ |  | (5) | ​ |  | — | ​ |  | —
Net realized losses | ​ | $ | (5) | ​ | $ | — | ​ | $ | 42
Proceeds from sales, maturities, calls and paydowns of securities | ​ | $ | 100,812 | ​ | $ | 55,328 | ​ | $ | 114,019
Schedule of securities in an unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | — | ​ | ​ | — | ​ | $ | 45,103 | ​ | $ | 780 | ​ | $ | 45,103 | ​ | $ | 780 | ​
U.S. government agencies and corporations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 87,094 | ​ | ​ | 9,313 | ​ | ​ | 87,094 | ​ | ​ | 9,313 | ​
Mortgage-backed securities | ​ |  | 5,528 | ​ | ​ | 68 | ​ |  | 150,023 | ​ |  | 16,155 | ​ |  | 155,551 | ​ |  | 16,223 | ​
Obligations of states and political subdivisions | ​ |  | 4,659 | ​ | ​ | 72 | ​ |  | 65,630 | ​ |  | 3,972 | ​ |  | 70,289 | ​ |  | 4,044 | ​
Corporate and other debt securities | ​ | ​ | 3,386 | ​ | ​ | 364 | ​ | ​ | 18,054 | ​ | ​ | 3,389 | ​ | ​ | 21,440 | ​ | ​ | 3,753 | ​
Total temporarily impaired securities | ​ | $ | 13,573 | ​ | $ | 504 | ​ | $ | 365,904 | ​ | $ | 33,609 | ​ | $ | 379,477 | ​ | $ | 34,113 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | 50,556 | ​ | $ | 1,368 | ​ | $ | 8,277 | ​ | $ | 685 | ​ | $ | 58,833 | ​ | $ | 2,053 | ​
U.S. government agencies and corporations | ​ | ​ | 71,948 | ​ | ​ | 1,578 | ​ | ​ | 58,326 | ​ | ​ | 11,389 | ​ | ​ | 130,274 | ​ | ​ | 12,967 | ​
Mortgage-backed securities | ​ | ​ | 73,301 | ​ |  | 5,441 | ​ |  | 104,563 | ​ |  | 15,099 | ​ |  | 177,864 | ​ |  | 20,540 | ​
Obligations of states and political subdivisions | ​ | ​ | 60,838 | ​ | ​ | 2,434 | ​ | ​ | 32,120 | ​ | ​ | 4,356 | ​ | ​ | 92,958 | ​ | ​ | 6,790 | ​
Corporate and other debt securities | ​ |  | 15,049 | ​ |  | 1,702 | ​ |  | 6,681 | ​ |  | 850 | ​ |  | 21,730 | ​ |  | 2,552 | ​
Total temporarily impaired securities | ​ | $ | 271,692 | ​ | $ | 12,523 | ​ | $ | 209,967 | ​ | $ | 32,379 | ​ | $ | 481,659 | ​ | $ | 44,902 | ​

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