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Earnings Per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding restricted stock units were vested and stock options were exercised, using the treasury stock method. 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 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=124432515&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=124432515&loc=d3e3630-109257 + Details
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