Premises and Equipment - Major Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 32,163	$ 28,863
Less: accumulated depreciation and amortization	13,881	12,749
Premises and equipment, net	18,282	16,114
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,731	3,719
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,122	11,446
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	1,226	1,224
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	8,332	7,576
Software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	3,232	3,206
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 520	$ 1,692