Revenue Recognition Of Non-Interest Income (Schedule Of Disaggregation Of Insurance Service And Other Fees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	$ 10,688	$ 9,365	$ 7,898
Commercial Property And Casualty Insurance Commissions [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	4,014	3,541	2,918
Personal Property And Casualty Insurance Commissions [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	3,416	3,067	2,608
Employee Benefits Sales Commissions [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	1,136	855	528
Profit Sharing And Contingent Revenue [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	1,050	905	928
Wealth Management And Other Financial Services [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	517	563	425
Insurance Claims Services Revenue [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	453	305	390
Other Insurance-Related Revenue [Member]
Disaggregation of Revenue [Line Items]
Total insurance service and other fees	$ 102	$ 129	$ 101