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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Data Abstract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 21,084 |  | $ 20,551 |  | $ 20,042 |  | $ 18,850 |  | $ 18,469 | $ 18,332 | $ 17,950 | $ 17,747 | $ 80,527 | $ 72,498 | $ 53,827
Total interest expense | 2,017 |  | 1,876 |  | 1,669 |  | 1,319 |  | 1,178 | 1,139 | 1,061 | 1,000 | 6,881 | 4,378 | 4,090
NET INTEREST INCOME | 19,067 |  | 18,675 |  | 18,373 |  | 17,531 |  | 17,291 | 17,193 | 16,889 | 16,747 | 73,646 | 68,120 | 49,737
Provision for loan losses | 400 |  | 950 |  | 950 |  | 1,050 |  | 990 | 1,110 | 990 | 780 |  |  |
Noninterest income | 6,051 |  | 6,058 |  | 6,055 |  | 5,887 |  | 6,076 | 6,485 | 5,737 | 4,946 | 24,051 | 23,244 | 18,306
Merger related costs | 452 |  | 270 |  | 104 |  | 62 |  | 19 | 31 | 224 | 289 | 888 | 563 | 6,392
Noninterest expense | 14,947 |  | 15,521 |  | 15,660 |  | 14,551 |  | 14,981 | 15,194 | 14,559 | 14,155 | 61,567 | 59,452 | 53,979
INCOME BEFORE INCOME TAXES | 9,319 |  | 7,992 |  | 7,714 |  | 7,755 |  | 7,377 | 7,343 | 6,853 | 6,469 | 32,780 | 28,042 | 10,554
INCOME TAXES | 4,084 | [1] | 2,009 | [1] | 2,004 | [1] | 1,972 | [1] | 2,014 | 1,967 | 1,833 | 1,671 | 10,069 | 7,485 | 2,499
NET INCOME | $ 5,235 |  | $ 5,983 |  | $ 5,710 |  | $ 5,783 |  | $ 5,363 | $ 5,376 | $ 5,020 | $ 4,798 | $ 22,711 | $ 20,557 | $ 8,055
Earnings per share - basic and diluted | $ 0.19 |  | $ 0.22 |  | $ 0.21 |  | $ 0.21 |  | $ 0.20 | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.82 | $ 0.76 | $ 0.36
[1] | Income tax expense for the fourth quarter was elevated due to the additional $1.8 million of tax expense from the re-measurement of the Company’s net deferred tax asset.

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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://www.xbrl.org/2003/role/presentationRef -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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- 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 No definition available. + Details
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: 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(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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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