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Investment Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Securities
Dec. 31, 2012
Securities
Schedule of Available-for-sale Securities [Line Items]    
Number of securities with unrealized loss 64 16
Percentage of gross unrealized loss 3.30% 0.70%
Percentage of amortized investment securities portfolio 1.40% 0.10%
Number of securities in continuous loss position 9 5
Loss duration 12 months 12 months
Gross gain on sale of investment securities $ 428,000 $ 230,000
Gross loss on sale of investment securities 0 8,000
Accrued interest receivable for investment securities 679,000 565,000
Securities pledged to secure public deposits 43,977,000 41,462,000
Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost on available for sale debt securities in continuous loss position 7,478,000 2,653,000
Non-U.S. Agency Mortgage-Backed [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss on available for sale of debt securities $ 378,000 $ 39,000