Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share

Schedule of computation of basic and diluted earnings per share

	Years Ended December 31,
(Dollars and shares in thousands)	2015		2014		2013
Basic earnings per common share:
Net income available to common shareholders	$	99,473	$	74,364	$	47,865
Weighted-average basic common shares		23,966		23,897		19,866
Basic earnings per common share	$	4.15	$	3.11	$	2.41
Diluted earnings per share:
Net income available to common shareholders	$	99,473	$	74,364	$	47,865
Weighted-average basic common shares		23,966		23,897		19,866
Effect of dilutive securities		258		257		211
Weighted-average dilutive shares		24,224		24,154		20,077
Diluted earnings per common share	$	4.11	$	3.08	$	2.38

Schedule of anti-dilutive securities excluded from computation of diluted earnings per common share

	Year Ended December 31,
(Dollars in thousands)	2015					2014					2013
Number of shares					47,865					22,497					21,361
Range of exercise prices	$	61.42	to	$	66.32	$	61.49	to	$	66.32	$	41.45	to	$	41.45