(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, 2017
Basic
Income available to common stockholders	$	23,182		15,903,805	$	1.46
Dilutive effect of stock options		—		357,883
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	23,182		16,261,688	$	1.42
Three Months Ended June 30, 2016
Basic
Income available to common stockholders	$	17,493		15,549,811	$	1.12
Dilutive effect of stock options		—		292,674
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	17,493		15,842,485	$	1.10
Six Months Ended June 30, 2017
Basic
Income available to common stockholders	$	45,232		15,884,414	$	2.85
Dilutive effect of stock options		—		365,581
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	45,232		16,249,995	$	2.78
Six Months Ended June 30, 2016
Basic
Income available to common stockholders	$	34,072		15,542,114	$	2.19
Dilutive effect of stock options		—		288,563
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	34,072		15,830,677	$	2.15

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 period because the options’ exercise prices were greater than the average market price of the common shares:

	Shares		Average Exercise Price
Three Months Ended June 30, 2017		19,505	$	90.64
Three Months Ended June 30, 2016		241,945		58.52
Six Months Ended June 30, 2017		9,807		90.64
Six Months Ended June 30, 2016		239,198		58.55