6. Earnings per share

Basic earnings per share (EPS) is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed in the same manner as basic EPS but also reflects the potential dilution that could occur from the grant of stock-based compensation awards. The Company maintains two active share-based compensation plans that may generate additional potentially dilutive common shares. For granted and unexercised stock-settled stock appreciation rights (SSARs), dilution would occur if Company-issued SSARs were exercised and converted into common stock. As of the three months ended March 31, 2020 and 2019, there were 28,070 and 29,708 potentially dilutive shares related to issued and unexercised SSARs. For restricted stock, dilution would occur from the Company’s previously granted but unvested shares. There were 6,303 and 11,058 potentially dilutive shares related to unvested restricted share grants as of the three months ended March 31, 2020 and 2019, respectively.

In the computation of diluted EPS, the Company uses the treasury stock method to determine the dilutive effect of its granted but unexercised stock options and SSARs and unvested restricted stock. Under the treasury stock method, the assumed proceeds, as defined, received from shares issued in a hypothetical stock option exercise or restricted stock grant, are assumed to be used to purchase treasury stock. Proceeds include amounts received from the exercise of outstanding stock options and compensation cost for future service that the Company has not yet recognized in earnings. The Company does not consider awards from share-based grants in the computation of basic EPS.

The following table illustrates the data used in computing basic and diluted EPS for the periods indicated:



	Three months ended March 31,
	2020		2019
(dollars in thousands except per share data)
Basic EPS:
Net income available to common shareholders	$	2,634	$	2,802
Weighted-average common shares outstanding		3,792,741		3,774,004
Basic EPS	$	0.69	$	0.74

Diluted EPS:
Net income available to common shareholders	$	2,634	$	2,802
Weighted-average common shares outstanding		3,792,741		3,774,004
Potentially dilutive common shares		34,373		40,766
Weighted-average common and potentially dilutive shares outstanding		3,827,114		3,814,770
Diluted EPS	$	0.69	$	0.73