(8)	NET INCOME PER COMMON SHARE

Basic and diluted net income per common share based on weighted-average shares outstanding are calculated as follows:

	Income (Numerator)		Shares (Denominator)		Per Share Amount
	(Dollars in thousands, except per share data)
Three Months Ended June 30, 2018
Basic
Income available to common stockholders	$	30,586		32,716,350	$	0.93
Dilutive effect of stock options		—		742,207
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	30,586		33,458,557	$	0.91
Three Months Ended June 30, 2017
Basic
Income available to common stockholders	$	23,182		31,807,610	$	0.73
Dilutive effect of stock options		—		715,766
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	23,182		32,523,376	$	0.71
Six Months Ended June 30, 2018
Basic
Income available to common stockholders	$	60,206		32,645,693	$	1.84
Dilutive effect of stock options		—		744,269
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	60,206		33,389,962	$	1.80
Six Months Ended June 30, 2017
Basic
Income available to common stockholders	$	45,232		31,768,828	$	1.43
Dilutive effect of stock options		—		731,162
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	45,232		32,499,990	$	1.39

The following table shows the number of options that were excluded from the computation of diluted net income per common share for each period because the options’ exercise prices were greater than the average market price of the common shares:

	Shares
Three Months Ended June 30, 2018		85,802
Three Months Ended June 30, 2017		39,010
Six Months Ended June 30, 2018		117,696
Six Months Ended June 30, 2017		19,614