Shareholders' Equity (Share Based Compensation) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 period	Mar. 31, 2013	Jun. 09, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized			1,000,000
Remaining shares issuable under 2009 Plan	206,081
Allocated Share-based Compensation Expense	$ 461,000	$ 592,000
Income tax benefit	95,000	135,000
Unrecognized compensation cost related to unvested awards	973,000
Recognition weighted-average period	2 years 1 month 28 days
Outstanding - January 1, Options (in shares)	1,317,678
Outstanding - January 1, Weighted Avg Exercise Price (in dollars per share)	$ 16.78
Granted, Options (in shares)	0	241,000
Granted, Weighted Avg Exercise Price (in dollars per share)	$ 0.00
Exercised, Options (in shares)	(59,204)
Exercised, Weighted Avg Exercise Price (in dollars per share)	$ 18.22
Exercised, Aggregate Intrinsic Value (In thousands)	285,000
Forfeited or Expired, Options (in shares)	(3,800)
Forfeited or Expired, Weighted Avg Exercise Price (in dollars per share)	$ 17.50
Outstanding - March 31, Options (in shares)	1,254,674
Outstanding - March 31, Weighted Avg Exercise Price (in dollars per share)	$ 16.71
Outstanding - March 31, Weighted Avg Remaining Contractual Term	3 years 1 month 20 days
Outstanding - March 31, Aggregate Intrinsic Value (In thousands)	7,323,000
Exercisable - March 31, Options (in shares)	898,594
Exercisable - March 31, Weighted Avg Exercise Price (in dollars per share)	$ 16.41
Exercisable - March 31, Weighted Avg Remaining Contractual Term	2 years 2 months 25 days
Exercisable - March 31, Aggregate Intrinsic Value (In thousands)	5,521,000
Restricted Stock Awards Disclosure [Abstract]
Restricted stock awards granted to director	75,000	69,000
Aggregate shares of restricted stock granted (in shares)	4,020	4,685
Grant date fair value	$ 94,000	$ 86,000
Weighted average fair value per share (in dollars per share)	$ 23.30	$ 18.41
Number Of Offering Period In Annual Period	4
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plan, Term	10 years