Employee Benefits (Other Information Regarding Options Outstanding And Exercisable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, # of shares	249,700
Options Outstanding, WAEP	$ 18.98
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	245,500
Options Exercisable, WAEP	$ 19.24
Options Exercisable, Aggregate Intrinsic Value
Range Of Exercise Price $ 2.54 - $ 6.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower	$ 2.54
Range of exercise price, Upper	$ 6.00
Options Outstanding, # of shares	38,950
Options Outstanding, WAEP	$ 5.11
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	2 years 4 months 17 days
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	35,950
Options Exercisable, WAEP	$ 5.33
Options Exercisable, Aggregate Intrinsic Value
Range Of Exercise Price $ 6.01 - $ 10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower	$ 6.01
Range of exercise price, Upper	$ 10.00
Options Outstanding, # of shares	28,400
Options Outstanding, WAEP	$ 9.14
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	3 years 7 months 24 days
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	27,200
Options Exercisable, WAEP	$ 9.27
Options Exercisable, Aggregate Intrinsic Value
Range Of Exercise Price $ 10.01 - $ 17.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower	$ 10.01
Range of exercise price, Upper	$ 17.50
Options Outstanding, # of shares	2,300
Options Outstanding, WAEP	$ 17.43
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	1 year 1 month 28 days
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	2,300
Options Exercisable, WAEP	$ 17.43
Options Exercisable, Aggregate Intrinsic Value
Range Of Exercise Price $ 17.51 - $ 20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower	$ 17.51
Range of exercise price, Upper	$ 20.00
Options Outstanding, # of shares	39,300
Options Outstanding, WAEP	$ 17.80
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	4 years 4 days
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	39,300
Options Exercisable, WAEP	$ 17.80
Options Exercisable, Aggregate Intrinsic Value
Range Of Exercise Price $ 20.01 - $ 25.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower	$ 20.01
Range of exercise price, Upper	$ 25.93
Options Outstanding, # of shares	140,750
Options Outstanding, WAEP	$ 25.15
Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs)	2 years 9 months 15 days
Options Outstanding, Aggregate Intrinsic Value
Options Exercisable, # of shares	140,750
Options Exercisable, WAEP	$ 25.15
Options Exercisable, Aggregate Intrinsic Value