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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
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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

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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