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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of Income:                      
Interest income $ 9,746 $ 9,590 $ 9,387 $ 9,004 $ 8,733 $ 8,444 $ 8,289 $ 8,184 $ 37,727 $ 33,650 $ 33,453
Interest expense 1,081 1,099 1,047 996 923 935 871 858 4,223 3,587 3,716
Net Interest Income 8,665 8,491 8,340 8,008 7,810 7,509 7,418 7,326 33,504 30,063 29,737
Provision for loan loss 197 308 339 277 85 243 183 114 1,121 625 1,191
Net interest income after provision for loan loss 8,468 8,183 8,001 7,731 7,725 7,266 7,235 7,212 32,383 29,438 28,546
Other income (expense) (3,967) (4,007) (3,773) (4,316) (3,904) (3,685) (3,682) (4,008)      
Net income before income taxes 4,501 4,176 4,228 3,415 3,821 3,581 3,553 3,204      
Income Taxes 1,307 1,161 1,254 934 1,049 961 956 853 4,656 3,819 3,871
Net income $ 3,194 $ 3,015 $ 2,974 $ 2,481 $ 2,772 $ 2,620 $ 2,597 $ 2,351 $ 11,664 $ 10,340 $ 9,646
Earnings per common share $ 0.70 $ 0.65 $ 0.65 $ 0.54 $ 0.60 $ 0.57 $ 0.56 $ 0.51      
Average common shares outstanding 4,620,831 4,612,766 4,605,534 4,609,226 4,621,122 4,615,379 4,608,453 4,623,322 4,572,133 4,582,058 4,595,900