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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Data Abstract |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 25,847 | $ 25,931 | $ 25,529 | $ 24,679 | $ 24,447 | $ 23,563 | $ 22,474 | $ 21,282 | $ 101,986 | $ 91,766 | $ 80,527
Total interest expense | 4,682 | 5,174 | 5,038 | 4,714 | 4,373 | 3,644 | 2,912 | 2,336 | 19,608 | 13,265 | 6,881
NET INTEREST INCOME | 21,165 | 20,757 | 20,491 | 19,965 | 20,074 | 19,919 | 19,562 | 18,946 | 82,378 | 78,501 | 73,646
Provision for loan losses | 600 | 550 | 750 | 550 | 525 | 950 | 750 | 775 | 2,450 | 3,000 | 3,350
Noninterest income | 7,647 | 7,441 | 6,994 | 6,520 | 6,705 | 6,478 | 6,306 | 6,010 | 28,602 | 25,499 | 24,051
Merger related costs (income) | 104 | 112 | (19) | 0 | (180) | 0 | 0 | 25 | 197 | (155) | 888
Noninterest expense | 16,247 | 16,311 | 16,723 | 15,977 | 16,163 | 16,180 | 15,458 | 15,071 |  |  |
INCOME BEFORE INCOME TAXES | 11,861 | 11,225 | 10,031 | 9,958 | 10,271 | 9,267 | 9,660 | 9,085 | 43,075 | 38,283 | 33,161
Income taxes | 2,186 | 2,071 | 1,488 | 1,570 | 1,585 | 1,183 | 1,587 | 1,359 | 7,315 | 5,714 | 10,450
NET INCOME | $ 9,675 | $ 9,154 | $ 8,543 | $ 8,388 | $ 8,686 | $ 8,084 | $ 8,073 | $ 7,726 | $ 35,760 | $ 32,569 | $ 22,711
Earnings per share - basic and diluted | $ 0.35 | $ 0.33 | $ 0.31 | $ 0.30 | $ 0.31 | $ 0.29 | $ 0.29 | $ 0.28 |  |  |

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