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Quarterly Financial Data (Unaudited) (Details) - 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
Quarterly Financial Data Abstract |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 24,447 | $ 23,563 | $ 22,474 | $ 21,282 | $ 21,084 | $ 20,551 | $ 20,042 | $ 18,850 | $ 91,766 | $ 80,527 | $ 72,498
Total interest expense | 4,373 | 3,644 | 2,912 | 2,336 | 2,017 | 1,876 | 1,669 | 1,319 | 13,265 | 6,881 | 4,378
NET INTEREST INCOME | 20,074 | 19,919 | 19,562 | 18,946 | 19,067 | 18,675 | 18,373 | 17,531 | 78,501 | 73,646 | 68,120
Provision for loan losses | 525 | 950 | 750 | 775 | 400 | 950 | 950 | 1,050 | 3,000 | 3,350 | 3,870
Noninterest income | 6,705 | 6,478 | 6,306 | 6,010 | 6,051 | 6,058 | 6,055 | 5,887 | 25,499 | 24,051 | 23,244
Merger related costs | (180) | 0 | 0 | 25 | 452 | 270 | 104 | 62 | (155) | 888 | 563
Noninterest expense | 16,163 | 16,180 | 15,458 | 15,071 | 14,852 | 15,425 | 15,565 | 14,456 | 62,717 | 61,186 | 59,452
INCOME BEFORE INCOME TAXES | 10,271 | 9,267 | 9,660 | 9,085 | 9,414 | 8,088 | 7,809 | 7,850 | 38,283 | 33,161 | 28,042
INCOME TAXES | 1,585 | 1,183 | 1,587 | 1,359 | 4,179 | 2,105 | 2,099 | 2,067 | 5,714 | 10,450 | 7,485
NET INCOME | $ 8,686 | $ 8,084 | $ 8,073 | $ 7,726 | $ 5,235 | $ 5,983 | $ 5,710 | $ 5,783 | $ 32,569 | $ 22,711 | $ 20,557
Earnings per share - basic and diluted | $ 0.31 | $ 0.29 | $ 0.29 | $ 0.28 | $ 0.19 | $ 0.22 | $ 0.21 | $ 0.21 |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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