Premises and Equipment - Summary of Major Components of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 19,742	$ 18,099
Less: Accumulated depreciation and amortization	(8,849)	(8,363)
Premises and equipment, net	10,893	9,736
Land [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	1,768	1,768
Land improvements [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	195	195
Bank buildings [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	8,581	8,395
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	8,252	7,330
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment	$ 946	$ 411