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Premises and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Renewal_Terms
Dec. 31, 2012
Dec. 31, 2011
Depreciation on premises and equipment $ 2,147 $ 1,948 $ 1,823
Rental expense, net of rental income 490 351 349
Sale leaseback transaction, lease term 17 years    
Sale leaseback transaction, number of automatic renewals 2    
Sale leaseback transaction, two automatic lease renewal, period 5 years 5 years  
Sale leaseback transaction, sale of property, amount 1,200    
Sale leaseback transaction, deferred gain 489    
Sale leaseback transaction, gain recognized 17 19 16
Facilities [Member]
      
Non cancelable operating leases having remaining term less than one year 20    
Vehicles [Member]
      
Non cancelable operating leases having remaining term less than one year 4    
Capital Addition Purchase Commitments [Member]
      
Contractual commitment to expand its main office facility in Clearfield, Pennsylvania at a cost 4,128    
Construction-related expenditures $ 3,112