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]
Depreciation	$ 5,884	$ 6,235	$ 6,088
Property, plant and equipment, gross	162,671	160,401
Less: accumulated depreciation	(89,989)	(85,236)
Property, Plant and Equipment, Net, Total	72,682	75,165
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,647	31,546
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 90,261	$ 88,698
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years	30 years
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years	10 years
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,763	$ 40,157
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years	7 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years