Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2013

Net Income Per Common Share [Abstract]

Basic and diluted net income per common share

Basic and diluted net income per common share are calculated as follows:

	Income (Numerator)		Shares (Denominator)		Per  Share Amount
	(Dollars in thousands, except per share data)
Three Months Ended March 31, 2013
Basic
Income available to common stockholders	$	13,372		15,238,701	$	0.88
Effect of stock options		—		243,816
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	13,372		15,482,517	$	0.86
Three Months Ended March 31, 2012
Basic
Income available to common stockholders	$	14,005		15,134,606	$	0.93
Effect of stock options		—		280,905
Diluted
Income available to common stockholders plus assumed exercises of stock options	$	14,005		15,415,511	$	0.91

Average exercise prices of options excluded from the computation of diluted net income per common share

The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each period because the options’ exercise prices were greater than the average market price of the common shares:

	Shares		Average Exercise Price
Three Months Ended March 31, 2013		534,000	$	39.44
Three Months Ended March 31, 2012		607,200	$	38.70