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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Income:                      
Interest income $ 10,868 $ 10,535 $ 10,124 $ 9,721 $ 9,746 $ 9,590 $ 9,387 $ 9,004 $ 41,248 $ 37,727 $ 33,650
Interest expense 1,362 1,333 1,253 1,179 1,081 1,099 1,047 996 5,127 4,223 3,587
Net Interest Income 9,506 9,202 8,871 8,542 8,665 8,491 8,340 8,008 36,121 33,504 30,063
Provision for loan loss 25 99 25 73 197 308 339 277 222 1,121 625
Net interest income after provision of loan loss 9,481 9,103 8,846 8,469 8,468 8,183 8,001 7,731 35,899 32,383 29,438
Other income (expense) (4,462) (4,722) (4,325) (4,487) (3,967) (4,007) (3,773) (4,316)      
Net income before income taxes 5,019 4,381 4,521 3,982 4,501 4,176 4,228 3,415      
Income Taxes 1,583 1,159 1,298 1,143 1,307 1,161 1,254 934 5,183 4,656 3,819
Net income $ 3,436 $ 3,222 $ 3,223 $ 2,839 $ 3,194 $ 3,015 $ 2,974 $ 2,481 $ 12,720 $ 11,664 $ 10,340
Earnings per Common Share $ 0.37 $ 0.35 $ 0.35 $ 0.31 $ 0.35 $ 0.33 $ 0.32 $ 0.27      
Average common shares outstanding 9,266,584 9,252,919 9,241,750 9,241,750 9,241,662 9,225,532 9,211,068 9,218,452 9,162,161 9,144,266 9,164,116