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Quarterly Financial Data (Unaudited) - Unaudited Quarterly Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Total interest and dividend income $ 20,489 $ 17,465 $ 16,758 $ 16,704 $ 16,965 $ 17,133 $ 17,207 $ 16,824 $ 71,416 $ 68,129 $ 65,712
Net interest income 17,279 14,648 13,826 13,451 13,588 13,670 13,274 12,677 59,204 53,209 48,133
Provision for loan losses 1,247 846 3,115 930 2,343 1,188 1,746 1,104 6,138 6,381 4,937
Non-interest income 3,676 3,248 3,771 3,071 2,803 3,079 3,264 3,518 13,766 12,664 10,719
Non-interest expense 12,995 10,343 10,793 9,682 8,890 9,208 8,833 9,014 43,813 35,945 33,282
Net income $ 4,728 $ 4,703 $ 2,951 $ 4,297 $ 3,890 $ 4,563 $ 4,336 $ 4,347 $ 16,679 $ 17,136 $ 15,104
Net income per share, basic $ 0.33 $ 0.38 $ 0.24 $ 0.34 $ 0.31 $ 0.37 $ 0.35 $ 0.35 $ 1.29 $ 1.38 $ 1.23
Net income per share, diluted $ 0.33 $ 0.38 $ 0.24 $ 0.34 $ 0.31 $ 0.37 $ 0.35 $ 0.35 $ 1.29 $ 1.38 $ 1.23