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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, 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 Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 57,223 | $ 55,351 | $ 53,084 | $ 50,475 | $ 50,211 | $ 46,338 | $ 43,691 | $ 41,084 | $ 216,133 | $ 181,324 | $ 161,241
Total interest expense | 17,062 | 15,389 | 14,139 | 12,328 | 10,403 | 9,319 | 8,590 | 7,943 | 58,918 | 36,255 | 31,096
Net interest income | 40,161 | 39,962 | 38,945 | 38,147 | 39,808 | 37,019 | 35,101 | 33,141 | 157,215 | 145,069 | 130,145
Provision for loan losses | 1,100 | 1,100 | 1,100 | 17,800 | 2,000 | 1,450 | 1,450 | 1,100 | 21,100 | 6,000 | 38,700
Total other income, net of securities gains | 1,515 | 1,429 | 1,388 | 1,407 | 2,024 | 1,756 | 1,422 | 1,406 |  |  |
Net securities gains |  |  |  |  |  |  |  | 1,596 |  |  |
Other expense | 18,266 | 18,287 | 17,108 | 17,059 | 16,566 | 18,641 | 25,303 | 18,249 |  |  |
Income before income taxes | 22,310 | 22,004 | 22,125 | 4,695 | 23,266 | 18,684 | 9,770 | 16,794 | 71,134 | 68,514 | 42,858
Income tax expense | 3,638 | 2,102 | 4,598 | 444 | 12,686 | 5,607 | 2,087 | 4,914 | 10,782 | 25,294 | 11,776
Net income | $ 18,672 | $ 19,902 | $ 17,527 | $ 4,251 | $ 10,580 | $ 13,077 | $ 7,683 | $ 11,880 | $ 60,352 | $ 43,220 | $ 31,082
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.58 | $ 0.62 | $ 0.54 | $ 0.13 | $ 0.33 | $ 0.41 | $ 0.24 | $ 0.37 | $ 1.87 | $ 1.35 | $ 1.02
Diluted (in Dollars per share) | $ 0.58 | $ 0.61 | $ 0.54 | $ 0.13 | $ 0.33 | $ 0.41 | $ 0.24 | $ 0.37 | $ 1.86 | $ 1.34 | $ 1.01

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