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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of Income:                      
Interest income $ 8,733 $ 8,444 $ 8,289 $ 8,184 $ 8,519 $ 8,471 $ 8,304 $ 8,159 $ 33,650 $ 33,453 $ 31,428
Interest expense 923 935 871 858 907 895 970 944 3,587 3,716 4,604
Net Interest Income 7,810 7,509 7,418 7,326 7,612 7,576 7,334 7,215 30,063 29,737 26,824
Provision for loan loss 85 243 183 114 37 282 444 428 625 1,191 858
Net interest income after provision for loan loss 7,725 7,266 7,235 7,212 7,575 7,294 6,890 6,787 29,438 28,546 25,966
Other income (expense) (3,904) (3,685) (3,682) (4,008) (3,800) (3,818) (3,456) (3,955)      
Net income before income taxes 3,821 3,581 3,553 3,204 3,775 3,476 3,434 2,832      
Income Taxes 1,049 961 956 853 1,114 1,002 881 874 3,819 3,871 3,596
Net income $ 2,772 $ 2,620 $ 2,597 $ 2,351 $ 2,661 $ 2,474 $ 2,553 $ 1,958 $ 10,340 $ 9,646 $ 9,007
Earnings per common share $ 0.60 $ 0.57 $ 0.56 $ 0.51 $ 0.57 $ 0.54 $ 0.55 $ 0.42      
Average common shares outstanding 4,621,122 4,615,379 4,608,453 4,623,322 4,627,338 4,621,298 4,626,309 4,637,172 4,582,058 4,595,900 4,645,929