Shareholders' Equity (Share Based Compensation) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	May. 08, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized			500,000
Shares authorized							1,500,000
Remaining shares issuable under 2009 Plan	314,793				314,793
Allocated Share-based Compensation Expense					$ 921,000	$ 732,000
Income tax benefit					300,000	$ 200,000
Unrecognized compensation cost related to unvested awards	$ 2,700,000				$ 2,700,000
Recognition weighted-average period					2 years 1 month 5 days
Outstanding - January 1, Options (in shares)		1,244,166			1,244,166
Outstanding - January 1, Weighted Avg Exercise Price (in dollars per share)		$ 17.49			$ 17.49
Granted, Options (in shares)					176,125	201,217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 23.28
Exercised, Options (in shares)					(135,507)
Exercised, Weighted Avg Exercise Price (in dollars per share)					$ 14.34
Exercised, Aggregate Intrinsic Value (In thousands)					$ 1,039,000
Forfeited or Expired, Options (in shares)					(4,281)
Forfeited or Expired, Weighted Avg Exercise Price (in dollars per share)					$ 19.48
Outstanding - June 30, Options (in shares)	1,280,503				1,280,503
Outstanding - June 30, Weighted Avg Exercise Price (in dollars per share)	$ 18.62				$ 18.62
Outstanding - June 30, Weighted Avg Remaining Contractual Term					3 years 8 months 28 days
Outstanding - June 30, Aggregate Intrinsic Value (In thousands)	$ 3,279,000				$ 3,279,000
Exercisable -June 30, Options (in shares)	694,823				694,823
Exercisable - June 30, Weighted Avg Exercise Price (in dollars per share)	$ 17.30				$ 17.30
Exercisable - June 30, Weighted Avg Remaining Contractual Term					2 years 3 months 23 days
Exercisable - June 30, Aggregate Intrinsic Value (In thousands)	$ 2,455,000				$ 2,455,000
Restricted Stock Awards Disclosure [Abstract]
Restricted Stock Awards, Value, Granted To Director					77,500	$ 75,000
Aggregate shares of restricted stock granted (in shares)	4,530	4,974	4,502	4,020
Issuance of restricted common stock for services	$ 97,000	$ 116,000	$ 105,000	$ 94,000	$ 213,000
Weighted average fair value per share (in dollars per share)	$ 21.38	$ 23.35	$ 23.29	$ 23.30
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plan, Term					10 years