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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Basic and diluted earnings per share | Basic and diluted earnings per share has been computed based on the following:
| Years ended
(Dollars in thousands, except per share data) | December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Net income available to common stockholders, basic and diluted | $ | 266,400 |  |  | 210,544 |  |  | 181,878 |
Average outstanding shares - basic | 94,883,864 |  |  | 88,255,290 |  |  | 83,603,515 |
Add: dilutive restricted stock units and stock options | 48,489 |  |  | 130,485 |  |  | 73,670 |
Average outstanding shares - diluted | 94,932,353 |  |  | 88,385,775 |  |  | 83,677,185 |
Basic earnings per share | $ | 2.81 |  |  | 2.39 |  |  | 2.18 |
Diluted earnings per share | $ | 2.81 |  |  | 2.38 |  |  | 2.17 |
Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 | 88,240 |  |  | — |  |  | 1,357 |
______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock units or the exercise price of a stock option exceeds the market price of the Company’s stock.

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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=6371337&loc=d3e3550-109257 + Details
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