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Stock plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock plans |
Schedule of activity related to restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021 |
Nonvested, January 1 |  | 39,470 |  | 36,281 |  | 31,923 | ​
Granted shares | ​ | 23,428 |  | 19,787 |  | 19,818 | ​
Vested shares |  | 16,791 | ​ | 16,403 | ​ | 15,460 | ​
(Surrendered) Forfeited shares | ​ | (12,524) | ​ | 195 | ​ | ​ | ​
Nonvested, December 31 |  | 58,631 |  | 39,470 |  | 36,281 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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