Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total Cost	$ 67,123	$ 62,817
Accumulated Depreciation and Amortization	(36,677)	(35,198)
Net Premises and Equipment	30,446	27,619
Land and Bank Premises
Property, Plant and Equipment [Line Items]
Total Cost	35,010	35,254
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Total Cost	30,192	25,662
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total Cost	$ 1,921	$ 1,901