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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding. The following table sets forth the computation of basic and diluted earnings per share:
| Years Ended December 31,
(Dollars and shares in thousands, except per share amounts) | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |
Net income | $ | 49,990 |  |  | $ | 47,319 |  |  | $ | 87,651 |
Denominator: |  |  |  |  |
Weighted average shares outstanding - basic | 18,681 |  |  | 18,573 |  |  | 18,374 |
Effect of dilutive shares | 25 |  |  | 140 |  |  | 285 |
Weighted average shares outstanding - diluted | 18,706 |  |  | 18,713 |  |  | 18,659 |
Basic earnings per share | $ | 2.68 |  |  | $ | 2.55 |  |  | $ | 4.77 |
Diluted earnings per share | $ | 2.67 |  |  | $ | 2.53 |  |  | $ | 4.70 |
Dilutive shares are calculated using the treasury stock method and primarily include unvested restricted stock units. Anti-dilutive shares are excluded from the calculation of diluted shares and diluted earnings per share. For 2020, 2019, and 2018, 8,454, 20,520 and 36,642 shares were excluded, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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