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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Basic and diluted earnings per share | Basic and diluted earnings per share has been computed based on the following:
| Three Months ended |  | Nine Months ended
(Dollars in thousands, except per share data) | September 30, 2021 |  | September 30, 2020 |  | September 30, 2021 |  | September 30, 2020
Net income available to common stockholders, basic and diluted | $ | 75,619 |  |  | 77,757 |  |  | 234,048 |  |  | 184,540 |
Average outstanding shares - basic | 95,510,772 |  |  | 95,411,656 |  |  | 95,494,211 |  |  | 94,704,198 |
Add: dilutive restricted stock units and stock options | 75,430 |  |  | 30,920 |  |  | 79,308 |  |  | 43,696 |
Average outstanding shares - diluted | 95,586,202 |  |  | 95,442,576 |  |  | 95,573,519 |  |  | 94,747,894 |
Basic earnings per share | $ | 0.79 |  |  | 0.81 |  |  | 2.45 |  |  | 1.95 |
Diluted earnings per share | $ | 0.79 |  |  | 0.81 |  |  | 2.45 |  |  | 1.95 |
Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 | — |  |  | 93,253 |  |  | — |  |  | 78,605 |
______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock unit 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=124432515&loc=d3e3550-109257 + Details
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