Premises And Equipment, Net (Major Classes Of Premises And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 97,619	$ 90,980
Accumulated depreciation and amortization	(52,430)	(48,582)
Premises and equipment, net	45,189	42,398
Depreciation and amortization	6,177	5,958	$ 5,429
Land And Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	6,003	6,003
Buildings And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	52,900	52,005
Furniture Fixtures Equipment And Vehicles [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	38,716	32,972
Occupancy And Equipment Expense [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 4,900	$ 4,600	$ 4,400