Employee Benefit Plans (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock issued as stock awards	15,475	16,876
Proceeds from exercise of stock options	$ 1,397,000	$ 488,000
Total intrinsic value of stock options exercised (less than 0.2 million for six months ended 2012)	200,000	200,000
Stock-based compensation expense	100,000	100,000
Unrecognized stock-based compensation expense	500,000
Weighted-average period, unrecognized expense expected to be recognized	1 year 9 months
Stock-based compensation expense related to restricted shares	300,000	300,000
Total expense associated with the retirement benefit plan	400,000	400,000
Contributions made by company	200,000	200,000
Stock Appreciation Rights (SARs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incentive stock options and SARs exercisable period	10 years
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incentive stock options and SARs exercisable period	10 years
Non-Vested Restricted Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized stock-based compensation expense	$ 3,100,000
Weighted-average period, unrecognized expense expected to be recognized	4 years 1 month 28 days
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Common stock issued upon the exercise of stock options, SARs and stock awards	750,000