Short-Term Borrowings - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Short-term Debt [Line Items]        
Maturity period of federal funds     1 day 4 days
Federal funds purchased $ 0 $ 0    
Securities sold under repurchase agreements 1,231,000 638,000    
Available fund lines from correspondent banks $ 18,800,000