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Net Income Per Common Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income Per Common Share | (16) NET INCOME PER COMMON SHARE Basic and diluted net income per common share are calculated as follows:
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
|  | (Dollars in thousands, except per share data) |
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 99,586 |  |  |  | 32,672,522 |  |  | $ | 3.05 |
Dilutive effect of stock options |  |  | — |  |  |  | 538,430 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 99,586 |  |  |  | 33,210,952 |  |  | $ | 3.00 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 134,879 |  |  |  | 32,639,396 |  |  | $ | 4.13 |
Dilutive effect of stock options |  |  | — |  |  |  | 690,448 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 134,879 |  |  |  | 33,329,844 |  |  | $ | 4.05 |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 125,814 |  |  |  | 32,689,228 |  |  | $ | 3.85 |
Dilutive effect of stock options |  |  | — |  |  |  | 741,486 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 125,814 |  |  |  | 33,430,714 |  |  | $ | 3.76 |
The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each year because the options were anti-dilutive for the period.
|  | Shares |  |  | Average Exercise Price |
December 31, 2020 |  |  | 402,575 |  |  | $ | 52.72 |
December 31, 2019 |  |  | 180,989 |  |  |  | 54.73 |
December 31, 2018 |  |  | 92,738 |  |  |  | 53.17 |

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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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