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STOCK-BASED COMPENSATION PLANS | 3 Months Ended
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Mar. 31, 2021
STOCK-BASED COMPENSATION PLANS |
STOCK-BASED COMPENSATION PLANS | ​ ​ 10. STOCK-BASED COMPENSATION PLANS The Corporation has a Stock Incentive Plan for a selected group of officers and an Independent Directors Stock Incentive Plan. The 2021 restricted stock awards under the Stock Incentive Plan vest ratably over three years, and the 2021 restricted stock issued under the Independent Directors Stock Incentive Plan vests over one year. Following is a summary of restricted stock awards granted in the three-month period ended March 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in Thousands) |  | ​ |  | Aggregate
​ | ​ | ​ | ​ | Grant
​ | ​ | ​ | ​ | Date
​ | ​ | Number of | ​ | Fair
​ | ​ | Shares | ​ | Value
1st quarter 2021 awards: | ​ | ​ | ​ | ​ | ​
Time-based awards to independent directors | ​ | 10,989 | ​ | $ | 220
Time-based awards to employees | ​ | 46,178 | ​ | ​ | 924
Performance-based awards to employees | ​ | 17,224 | ​ | ​ | 345
Total | ​ | 74,391 | ​ | $ | 1,489
​ Compensation cost related to restricted stock is recognized based on the fair value of the stock at the grant date over the vesting period, adjusted for estimated and actual forfeitures. Total annual stock-based compensation for the year ending December 31, 2021 is estimated to total $1,600,000. Total stock-based compensation expense attributable to restricted stock awards amounted to $341,000 in the first quarter 2021 and $194,000 in the first quarter 2020.

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