Basic earnings per common share are computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock options. The difference in earnings per share under the -class method was significant at and

 

		Year Ended December 31,
		2018				2017				2016
		(Dollar Amounts In Thousands Except Per Share Amounts)
Earnings Per Share
Weighted average common shares outstanding			53,172,695				52,887,359				52,450,896
Net income available to common stockholders		$	136,877			$	93,030			$	81,432
Basic earnings per common share		$	2.57				1.76			$	1.55
Weighted average common shares outstanding			53,172,695				52,887,359				52,450,896
Dilutive effects of assumed conversions and exercise of stock options and warrants			997,184				1,236,598				1,157,476
Weighted average common and dilutive potential common shares outstanding			54,169,879				54,123,957				53,608,372
Net income available to common stockholders		$	136,877			$	93,030			$	81,432
Diluted earnings per common share		$	2.53			$	1.72			$	1.52