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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of Income: |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 18,139 | $ 17,293 | $ 17,273 | $ 17,464 | $ 17,149 | $ 17,012 | $ 18,283 | $ 15,862 | $ 70,169 | $ 68,306 | $ 46,429
Interest expense | 2,015 | 2,269 | 2,698 | 3,411 | 3,813 | 4,112 | 3,749 | 3,085 | 10,393 | 14,759 | 6,572
Net Interest Income Before Provision for Loan Losses | 16,124 | 15,024 | 14,575 | 14,053 | 13,336 | 12,900 | 14,534 | 12,777 | 59,776 | 53,547 | 39,857
Provision for loan loss | 1,995 | 1,987 | 1,569 | 1,430 | 728 | 247 | 133 | 30 | 6,981 | 1,138 | 324
Net Interest Income After Provision for Loan Losses | 14,129 | 13,037 | 13,006 | 12,623 | 12,608 | 12,653 | 14,401 | 12,747 | 52,795 | 52,409 | 39,533
Other income (expense) | (5,662) | (7,340) | (7,041) | (7,546) | (6,756) | (7,419) | (6,673) | (8,799) |  |  |
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries | 8,467 | 5,697 | 5,965 | 5,077 | 5,852 | 5,234 | 7,728 | 3,948 |  |  |
Income Taxes | 1,691 | 1,287 | 1,161 | 972 | 1,129 | 959 | 1,548 | 724 | 5,111 | 4,360 | 3,301
Net Income | $ 6,776 | $ 4,410 | $ 4,804 | $ 4,105 | $ 4,723 | $ 4,275 | $ 6,180 | $ 3,224 | $ 20,095 | $ 18,402 | $ 14,949
Earnings per Common Share | $ 0.60 | $ 0.40 | $ 0.43 | $ 0.37 | $ 0.43 | $ 0.38 | $ 0.56 | $ 0.29 | $ 1.80 | $ 1.66 | $ 1.61
Average common shares outstanding | 11,177,765 | 11,142,797 | 11,129,341 | 11,134,870 | 11,137,004 | 11,121,426 | 11,106,367 | 11,089,839 | 11,061,391 | 11,030,441 | 9,179,964

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