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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Income: |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 17,149 | $ 17,012 | $ 18,283 | $ 15,862 | $ 12,003 | $ 11,753 | $ 11,537 | $ 11,136 | $ 68,306 | $ 46,429 | $ 41,248
Interest expense | 3,813 | 4,112 | 3,749 | 3,085 | 1,817 | 1,765 | 1,527 | 1,463 | 14,759 | 6,572 | 5,127
Net Interest Income Before Provision for Loan Losses | 13,336 | 12,900 | 14,534 | 12,777 | 10,186 | 9,988 | 10,010 | 9,673 | 53,547 | 39,857 | 36,121
Provision for loan loss | 728 | 247 | 133 | 30 | 105 | 47 | 132 | 40 | 1,138 | 324 | 222
Net Interest Income After Provision for Loan Losses | 12,608 | 12,653 | 14,401 | 12,747 | 10,081 | 9,941 | 9,878 | 9,633 | 52,409 | 39,533 | 35,899
Other income (expense) | (6,783) | (7,445) | (6,731) | (8,816) | (6,052) | (5,443) | (4,832) | (5,030) |  |  |
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries | 5,825 | 5,208 | 7,670 | 3,931 | 4,029 | 4,498 | 5,046 | 4,603 |  |  |
Income Taxes | 1,102 | 933 | 1,490 | 707 | 836 | 623 | 932 | 836 | 4,232 | 3,227 | 5,183
Net Income | $ 4,723 | $ 4,275 | $ 6,180 | $ 3,224 | $ 3,193 | $ 3,875 | $ 4,114 | $ 3,767 | $ 18,402 | $ 14,949 | $ 12,720
Earnings per Common Share | $ 0.43 | $ 0.38 | $ 0.56 | $ 0.29 | $ 0.34 | $ 0.42 | $ 0.44 | $ 0.41 | $ 1.66 | $ 1.61 | $ 1.38
Average common shares outstanding | 11,137,004 | 11,121,426 | 11,106,367 | 11,089,839 | 9,285,261 | 9,274,507 | 9,265,898 | 9,265,959 | 11,030,441 | 9,179,964 | 9,162,161

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 + Details
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