Premises and Equipment - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Renewal_Terms Lease	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation on premises and equipment	$ 2,756	$ 2,659	$ 2,147
Rental expense, net of rental income	$ 699	736	490
Sale leaseback transaction, lease term	17 years
Sale leaseback transaction, number of automatic renewals | Renewal_Terms	2
Sale leaseback transaction, two automatic lease renewal, period	5 years
Sale leaseback transaction, sale of property, amount	$ 1,200
Sale leaseback transaction, deferred gain	489
Sale leaseback transaction, gain recognized	$ 22	19	$ 17
Facilities [Member]
Property, Plant and Equipment [Line Items]
Non cancelable operating leases having remaining term less than one year | Lease	19
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Non cancelable operating leases having remaining term less than one year | Lease	13
Capital Addition Purchase Commitments [Member] | Worthington, Ohio [Member]
Property, Plant and Equipment [Line Items]
Contractual commitment to construct / remodel the facility	$ 5,948
Amount of construction completed	2,006
Capital Addition Purchase Commitments [Member] | Clearfield, Pennsylvania [Member]
Property, Plant and Equipment [Line Items]
Contractual commitment to construct / remodel the facility		$ 9,935
Amount of construction completed	5,658
Construction in process	$ 4,277