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Share-Based Compensation - Stock Options (Details) - USD ($) | 12 Months Ended | 192 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019
2004 plan |  |  |  |
Additional disclosures |  |  |  |
Granted (in shares) |  |  |  | 0
2020 plan |  |  |  |
Share-Based Compensation |  |  |  |
Number of shares registered | 2,072,245 |  |  |
Employee Stock Option [Member] |  |  |  |
Number of shares |  |  |  |
Outstanding at the beginning of the period (in shares) | 161,832 | 185,125 | 256,425 |
Assumed stock options and warrants from ACBI merger (in shares) |  | 23,410 |  |
Exercised (in shares) | (48,749) | (43,525) | (64,075) |
Forfeited (in shares) |  | (356) | (6,250) |
Expired (in shares) | (5,491) | (2,822) | (975) |
Outstanding at the end of the period (in shares) | 107,592 | 161,832 | 185,125 |
Exercisable at the end of the period (in shares) | 107,592 | 161,832 | 185,125 |
Weighted-Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 66.20 | $ 63.03 | $ 59.01 |
Assumed stock options and warrants from ACBI merger (in dollars per share) |  | 40.73 |  |
Exercised (in dollars per share) | 55.88 | 41.16 | 45.35 |
Expired (in dollars per share) | 32.25 | 36.98 | 24.37 |
Forfeited (in dollars per share) |  | 38.31 | 85.42 |
Outstanding at the end of the period (in dollars per share) | 72.60 | 66.20 | 63.03 |
Exercisable at the end of the period (in dollars per share) | $ 72.60 | $ 66.20 | $ 63.03 |
Aggregate Intrinsic Value |  |  |  |
Exercisable at the end of the period | $ 1,700,000 | $ 2,500,000 | $ 3,800,000 |
Additional disclosures |  |  |  |
Total unrecognized compensation cost related to non vested stock option grants | 0 | 0 | 0 |
Intrinsic value of stock option shares exercised | $ 1,100,000 | $ 1,700,000 | $ 2,300,000 |
Incentive stock options | Maximum |  |  |  |
Share-Based Compensation |  |  |  |
Vesting period | 4 years |  |  |
Incentive stock options | Plan 2004 and 2012 |  |  |  |
Share-Based Compensation |  |  |  |
Vesting percentage | 25.00% |  |  |
Expiration period | 10 years |  |  |

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