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]
Subtotal	$ 59,534	$ 59,638
Less: Accumulated Depreciation and Amortization	30,855	30,409
Total	28,679	29,229
Depreciation and amortization	2,186	1,896	$ 1,685
Total rental expense	688	644	604
Rental income	169	102	$ 94
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Subtotal	36,018	37,003
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Subtotal	20,399	20,196
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Subtotal	$ 3,117	$ 2,439