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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of Income:                      
Interest income $ 12,003 $ 11,753 $ 11,537 $ 11,136 $ 10,868 $ 10,535 $ 10,124 $ 9,721 $ 46,429 $ 41,248 $ 37,727
Interest expense 1,817 1,765 1,527 1,463 1,362 1,333 1,253 1,179 6,572 5,127 4,223
Net Interest Income Before Provision for Loan Losses 10,186 9,988 10,010 9,673 9,506 9,202 8,871 8,542 39,857 36,121 33,504
Provision for loan loss 105 47 132 40 25 99 25 73 324 222 1,121
Net Interest Income After Provision for Loan Losses 10,081 9,941 9,878 9,633 9,481 9,103 8,846 8,469 39,533 35,899 32,383
Other income (expense) (6,052) (5,443) (4,832) (5,030) (4,462) (4,722) (4,325) (4,487)      
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries 4,029 4,498 5,046 4,603 5,019 4,381 4,521 3,982      
Income Taxes 836 623 932 836 1,583 1,159 1,298 1,143 3,227 5,183 4,656
Net Income $ 3,193 $ 3,875 $ 4,114 $ 3,767 $ 3,436 $ 3,222 $ 3,223 $ 2,839 $ 14,949 $ 12,720 $ 11,664
Basic and Diluted Earnings Per Share $ 0.34 $ 0.42 $ 0.44 $ 0.41 $ 0.37 $ 0.35 $ 0.35 $ 0.31 $ 1.61 $ 1.38 $ 1.27
Average common shares outstanding 9,285,261 9,274,507 9,265,898 9,265,959 9,266,584 9,252,919 9,241,750 9,241,750 9,179,964 9,162,161 9,144,266