Employee Benefit Plans (Summary Of Status Of Post-Retirement Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 8,882	$ 10,259	$ 6,564
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	16,754	14,919
Service cost	1,165	1,017	902
Interest cost	934	849	780
Actuarial loss	2,930	412
Excise tax cost	53
Benefits paid	(374)	(443)
Benefit obligation at end of year	21,462	16,754	14,919
Employer contributions	374	443
Funded status at end of year	$ (21,462)	$ (16,754)