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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 41,499 | $ 41,178 | $ 40,038 | $ 38,526 | $ 37,230 | $ 36,186 | $ 34,181 | $ 33,370 | $ 161,241 | $ 140,967 | $ 94,207
Total interest expense | 8,092 | 8,154 | 7,644 | 7,206 | 6,774 | 6,459 | 5,503 | 5,078 | 31,096 | 23,814 | 14,808
Net interest income | 33,407 | 33,024 | 32,394 | 31,320 | 30,456 | 29,727 | 28,678 | 28,292 | 130,145 | 117,153 | 79,399
Provision for loan and lease losses | 25,200 | 6,750 | 3,750 | 3,000 | 5,055 | 4,175 | 1,550 | 1,825 | 38,700 | 12,605 | 4,683
Total other income, net of securities gains | 1,573 | 1,445 | 1,467 | 1,202 | 1,225 | 1,752 | 3,215 | 1,049 |  |  |
Net securities (losses) gains |  | 4,131 | 103 |  | 1,138 | 2,067 | 221 | 506 |  |  |
Other expense | 15,252 | 14,551 | 14,352 | 14,353 | 13,579 | 13,301 | 14,974 | 12,631 |  |  |
Income before income taxes | (5,472) | 17,299 | 15,862 | 15,169 | 14,185 | 16,070 | 15,590 | 15,391 | 42,858 | 61,237 | 27,410
Income tax expense | (3,448) | 5,443 | 5,003 | 4,778 | 4,617 | 5,228 | 5,069 | 5,012 | 11,776 | 19,926 | 8,845
Net income | (2,024) | 11,856 | 10,859 | 10,391 | 9,568 | 10,842 | 10,521 | 10,379 | 31,082 | 41,311 | 18,565
Preferred dividends |  |  |  | 22 | 28 | 28 | 28 | 28 |  | 112 | 112
Net income available to common stockholders | $ (2,024) | $ 11,856 | $ 10,859 | $ 10,369 | $ 9,540 | $ 10,814 | $ 10,493 | $ 10,351 | $ 31,060 | $ 41,199 | $ 18,453
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ (0.07) | $ 0.39 | $ 0.36 | $ 0.35 | $ 0.32 | $ 0.36 | $ 0.35 | $ 0.35 | $ 1.02 | $ 1.37 | $ 0.80
Diluted (in Dollars per share) | $ (0.07) | $ 0.39 | $ 0.36 | $ 0.34 | $ 0.31 | $ 0.36 | $ 0.35 | $ 0.34 | $ 1.01 | $ 1.36 | $ 0.79

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