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Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Securities |
Summary of available for sale debt securities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. Treasury securities | ​ | $ | 28,944 | ​ | $ | — | ​ | $ | (638) | ​ | $ | 28,306 | ​
U.S. government agencies and corporations | ​ | ​ | 84,380 | ​ | ​ | — | ​ | ​ | (9,662) | ​ | ​ | 74,718 | ​
Mortgage-backed securities | ​ |  | 176,686 | ​ |  | 52 | ​ |  | (17,550) | ​ |  | 159,188 | ​
Obligations of states and political subdivisions | ​ |  | 149,497 | ​ |  | 1,640 | ​ | ​ | (4,486) | ​ |  | 146,651 | ​
Corporate and other debt securities | ​ | ​ | 25,177 | ​ | ​ | — | ​ | ​ | (3,619) | ​ | ​ | 21,558 | ​
​ | ​ | $ | 464,684 | ​ | $ | 1,692 | ​ | $ | (35,955) | ​ | $ | 430,421 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
Schedule of amortized cost and estimated fair value of securities, by the earlier of contractual maturity or expected maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 |
​ |  | Amortized |  | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Fair Value |
Due in one year or less | ​ | $ | 90,655 | ​ | $ | 87,601 | ​
Due after one year through five years | ​ |  | 174,821 | ​ |  | 159,652 | ​
Due after five years through ten years | ​ |  | 127,667 | ​ |  | 114,580 | ​
Due after ten years | ​ |  | 71,541 | ​ |  | 68,588 | ​
​ | ​ | $ | 464,684 | ​ | $ | 430,421 | ​
Schedule of gross realized gains and losses and the proceeds | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
(Dollars in thousands) |  | 2024 |  | 2023
Realized gains from sales, maturities and calls of securities: | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains | ​ | $ | — | ​ | $ | —
Gross realized losses | ​ |  | — | ​ |  | (5)
Net realized losses | ​ | $ | — | ​ | $ | (5)
Proceeds from sales, maturities, calls and paydowns of securities | ​ | $ | 37,324 | ​ | $ | 19,730
Schedule of securities in an unrealized loss position | Securities in an unrealized loss position at March 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 | ​ | $ | — | ​ | ​ | — | ​ | $ | 28,306 | ​ | $ | 638 | ​ | $ | 28,306 | ​ | $ | 638 | ​
U.S. government agencies and corporations | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 74,718 | ​ | ​ | 9,662 | ​ | ​ | 74,718 | ​ | ​ | 9,662 | ​
Mortgage-backed securities | ​ |  | 6,491 | ​ | ​ | 119 | ​ |  | 147,290 | ​ |  | 17,431 | ​ |  | 153,781 | ​ |  | 17,550 | ​
Obligations of states and political subdivisions | ​ |  | 14,416 | ​ | ​ | 183 | ​ |  | 64,810 | ​ |  | 4,303 | ​ |  | 79,226 | ​ |  | 4,486 | ​
Corporate and other debt securities | ​ | ​ | 2,672 | ​ | ​ | 328 | ​ | ​ | 18,886 | ​ | ​ | 3,291 | ​ | ​ | 21,558 | ​ | ​ | 3,619 | ​
Total | ​ | $ | 23,579 | ​ | $ | 630 | ​ | $ | 334,010 | ​ | $ | 35,325 | ​ | $ | 357,589 | ​ | $ | 35,955 | ​
Securities in an unrealized loss position at December 31, 2023, 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 | ​ | $ | — | ​ | ​ | — | ​ | $ | 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 | ​ | $ | 13,573 | ​ | $ | 504 | ​ | $ | 365,904 | ​ | $ | 33,609 | ​ | $ | 379,477 | ​ | $ | 34,113 | ​

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