Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Common Share

Schedule of computation of basic and diluted earnings per share

	Years Ended December 31,
(Dollars in thousands)	2012		2011		2010
Numerator:
Net income available to common shareholders—numerator for basic and diluted earnings per share	$	30,032	$	22,595	$	51,882
Denominator:
Denominator for basic earnings per share—weighted-average shares outstanding		14,698		13,677		12,618
Effect of dilutive securities:
Employee stock options and restricted stock		98		74		102
Dilutive potential shares:
Denominator for diluted earnings per share—adjusted weighted-average shares		14,796		13,751		12,720
Basic earnings per common share	$	2.04	$	1.65	$	4.11
Diluted earnings per common share	$	2.03	$	1.63	$	4.08

Schedule of antidilutive securities excluded from computation of diluted earnings per share

	Years Ended December 31,
(Dollars in thousands)	2012		2011		2010
Number of shares		138,729		256,664		152,919
Range of exercise prices	$	31.10 to $40.99	$	26.01 to $40.99	$	27.57 to $40.99