Earnings per Common Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share, Basic, Other Disclosures [Abstract]

Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted EPS

The following table reconciles the number of shares used in calculating the basic and diluted earnings per share for the years ended December 31:

(Dollars in thousands, except per-share amounts)	2012		2011		2010
Net income	$	42,594	$	40,266	$	40,394
Basic weighted-average shares outstanding	40,333,333		40,159,141		39,971,073
Incremental shares due to:
Stock options	15,520		45,232		81,942
Performance shares	134,079		146,157		132,455
Restricted stock units	70,217		32,455		33,859
Diluted weighted-average shares outstanding	40,553,149		40,382,985		40,219,329
Basic net income per share	$	1.06	$	1.00	$	1.01
Diluted net income per share	$	1.05	$	1.00	$	1.00
Anti-dilutive shares excluded from the calculation:
Performance shares	—		77,767		—
Restricted stock units	315		1,500		5,750
Total anti-dilutive shares excluded from the calculation	315		79,267		5,750