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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Factors Used in Computation of Earnings Per Share | The factors used in the earnings per share computation follow:
| Year Ended December 31,
(Dollars in thousands) | 2021 |  | 2020 |  | 2019
Basic |  |  |  |  |
Net income to common stockholders | $ | 109,768 |  |  | $ | 62,323 |  |  | $ | 58,544 |
Weighted average common shares outstanding | 24,736,713 |  |  | 24,387,932 |  |  | 25,941,395 |
Basic earnings per common share | $ | 4.44 |  |  | $ | 2.56 |  |  | $ | 2.26 |
Diluted |  |  |  |  |
Net income to common stockholders | $ | 109,768 |  |  | $ | 62,323 |  |  | $ | 58,544 |
Weighted average common shares outstanding | 24,736,713 |  |  | 24,387,932 |  |  | 25,941,395 |
Dilutive effects of: |  |  |  |  |
Assumed exercises of stock options | 130,198 |  |  | 64,104 |  |  | 63,808 |
Restricted stock awards | 170,276 |  |  | 86,498 |  |  | 47,242 |
Restricted stock units | 76,049 |  |  | 25,978 |  |  | 3,441 |
Performance stock units - market based | 136,199 |  |  | 51,304 |  |  | 4,119 |
Performance stock units - performance based | — |  |  | — |  |  | — |
Employee stock purchase plan | 2,617 |  |  | — |  |  | — |
Average shares and dilutive potential common shares | 25,252,052 |  |  | 24,615,816 |  |  | 26,060,005 |
Diluted earnings per common share | $ | 4.35 |  |  | $ | 2.53 |  |  | $ | 2.25 |
Schedule of Shares not Considered in Computing Diluted Earnings per Common Share | Shares that were not considered in computing diluted earnings per common share because they were antidilutive or have not met the thresholds to be considered in the dilutive calculation are as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Stock options | 16,939 |  |  | 64,947 |  |  | 66,019 |
Restricted stock awards | 8,463 |  |  | — |  |  | — |
Restricted stock units | 15,000 |  |  | — |  |  | — |
Performance stock units - market based | — |  |  | — |  |  | 55,228 |
Performance stock units - performance based | 259,383 |  |  | 256,625 |  |  | 254,000 |
Employee stock purchase plan | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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