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Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items] |  |  |  |  |
Net interest income | $ 27,546 | $ 11,722 | $ 50,820 | $ 34,320 |
Noninterest income | 1,173 | 1,543 | 5,422 | 5,095 |
Net income | 1,766 | 5,094 | 10,542 | 14,941 | 19,925
Legacy ConnectOne [Member] |  |  |  |  |
Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items] |  |  |  |  |
Net interest income |  |  | 78,872 | 71,091 |
Noninterest income |  |  | 6,168 | 5,948 |
Noninterest expense |  |  | (41,073) | (34,352) |
Net income |  |  | $ 26,490 | $ 26,125 |
Pro forma earnings per share from continuing operations: |  |  |  |  |
Basic (in Dollars per share) |  |  | $ 0.89 | $ 0.91 |
Diluted (in Dollars per share) |  |  | $ 0.88 | $ 0.90 |

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