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Quarterly Financial Information of ConnectOne Bancorp, Inc. (Unaudited) (Details) - Schedule of Quarterly Financial Information - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Schedule of Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 50,211 | $ 46,338 | $ 43,691 | $ 41,084 | $ 41,499 | $ 41,178 | $ 40,038 | $ 38,526 | $ 181,324 | $ 161,241 | $ 140,967
Total interest expense | 10,403 | 9,319 | 8,590 | 7,943 | 8,092 | 8,154 | 7,644 | 7,206 | 36,255 | 31,096 | 23,814
Net interest income | 39,808 | 37,019 | 35,101 | 33,141 | 33,407 | 33,024 | 32,394 | 31,320 | 145,069 | 130,145 | 117,153
Provision for loan losses | 2,000 | 1,450 | 1,450 | 1,100 | 25,200 | 6,750 | 3,750 | 3,000 | 6,000 | 38,700 | 12,605
Total other income, net of securities gains | 2,024 | 1,756 | 1,422 | 1,406 | 1,573 | 1,445 | 1,467 | 1,202 |  |  |
Net securities gains |  |  |  | 1,596 |  | 4,131 | 103 |  |  |  |
Other expense | 16,566 | 18,641 | 25,303 | 18,249 | 15,252 | 14,551 | 14,352 | 14,353 |  |  |
Income before income taxes | 23,266 | 18,684 | 9,770 | 16,794 | (5,472) | 17,299 | 15,862 | 15,169 | 68,514 | 42,858 | 61,237
Income tax expense | 12,686 | 5,607 | 2,087 | 4,914 | (3,448) | 5,443 | 5,003 | 4,778 | 25,294 | 11,776 | 19,926
Net income | $ 10,580 | $ 13,077 | $ 7,683 | $ 11,880 | (2,024) | 11,856 | 10,859 | 10,391 | 43,220 | 31,082 | 41,311
Preferred dividends |  |  |  |  |  |  |  | 22 |  | 22 | 112
Net income available to common stockholders |  |  |  |  | $ (2,024) | $ 11,856 | $ 10,859 | $ 10,369 | $ 43,220 | $ 31,060 | $ 41,199
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.33 | $ 0.41 | $ 0.24 | $ 0.37 | $ (0.07) | $ 0.39 | $ 0.36 | $ 0.35 | $ 1.35 | $ 1.02 | $ 1.37
Diluted (in Dollars per share) | $ 0.33 | $ 0.41 | $ 0.24 | $ 0.37 | $ (0.07) | $ 0.39 | $ 0.36 | $ 0.34 | $ 1.34 | $ 1.01 | $ 1.36

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