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Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Contract
Dec. 31, 2012
Contract
Dec. 31, 2011
Amortized Cost And Fair Value Debt Securities [Abstract]      
Number of U.S. agency and mortgage-backed securities 40 12  
Number of obligations of state and political subdivisions in an unrealized loss position 21 9  
Percentage of investment portfolio 100.00%    
Weighted-average period of re-pricing of portfolio 4 years 6 months 3 years 7 months 6 days  
Proceeds from maturities, calls, and principal payments of securities available for sale $ 4,600,000 $ 36,300,000 $ 14,900,000
Gross realized gains on securities available for sale 0 1,300,000 65,000
Gross realized losses on securities available for sale 0 0 6,000
Securities book value 3,100,000 24,000,000  
Impairment recognized $ 0