Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Basic and diluted earnings per share

Basic and diluted earnings per share has been computed based on the following:

	Years ended
(Dollars in thousands, except per share data)	December 31, 2014		December 31, 2013	December 31, 2012
Net income available to common stockholders, basic and diluted	$	112,755	95,644	75,516
Average outstanding shares - basic	74,641,957		73,191,713	71,928,570
Add: dilutive stock options and awards	45,358		68,565	86
Average outstanding shares - diluted	74,687,315		73,260,278	71,928,656
Basic earnings per share	$	1.51	1.31	1.05
Diluted earnings per share	$	1.51	1.31	1.05