	For the Years Ended December 31,
(in thousands, except shares and per share amounts)	2020		2019		2018
Numerator for both basic and diluted earnings per common share:
Net income available to common shareholders	$	119,400	$	158,873	$	143,112
Denominator:
Total average basic common shares outstanding		67,260,796		56,108,084		48,889,041
Effect of dilutive stock options and other stock compensation		49,788		106,280		133,949
Total diluted average common shares outstanding		67,310,584		56,214,364		49,022,990
Earnings per common share—basic	$	1.78	$	2.83	$	2.93
Earnings per common share—diluted		1.77		2.83		2.92

As of December 31, 2020, 2019 and 2018, respectively, 497,540, 364,391 and 117,600 options to purchase shares were excluded in the diluted shares computation because the exercise price was greater than the average market price of the common shares and, therefore, the effect would be antidilutive.

As of December 31, 2020 and 2019, shares related to the total shareholder return plans were not included in the calculation because the effect would be antidilutive. As of December 31, 2018, contingently issuable shares totaling 42,864 were estimated to be awarded under the 2018 and 2017 total shareholder return plans as stock performance targets were met to date and were included in the diluted calculation. The shares related to the 2017 total shareholder return plan were not included in the calculation because the effect would be antidilutive.

No performance-based restricted stock compensation was estimated to be awarded as of December 31, 2020. Performance-based restricted stock compensation totaling 25,616 and 17,081 shares were estimated to be awarded as of December 31, 2019 and 2018, respectively.

On November 22, 2019, Wesbanco issued 13,351,837 shares of common stock to complete its acquisition of OLBK and granted 34,998 shares of restricted stock to certain OLBK employees. These shares are included in average shares outstanding beginning on that date. For additional information relating to the OLBK acquisition, refer to Note 2, “Mergers and Acquisitions.”

On August 20, 2018, Wesbanco issued 7,920,387 shares of common stock, 6,690 of which were from treasury stock, to complete its acquisition of FFKT and granted 18,685 shares of restricted stock to certain FFKT employees of which 4,922 shares were forfeited prior to vesting in 2020. These shares are included in average shares outstanding beginning on that date. For additional information relating to the FFKT acquisition, refer to Note 2, “Mergers and Acquisitions.”

On April 5, 2018, Wesbanco issued 2,498,761 shares of common stock to complete its acquisition of FTSB and granted 9,465 shares of restricted stock to certain FTSB employees. These shares are included in average shares outstanding beginning on that date. For additional information relating to the FTSB acquisition, refer to Note 2, “Mergers and Acquisitions.”