Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights				The Corporation maintains two stock-based compensation plans from which new grants could be issued. The Corporation’s stock-based compensation plans permit Parent Corporation common stock to be issued to key employees and directors of the Corporation and its subsidiaries. The options granted under the plans are intended to be either incentive stock options or non-qualified options. Under the 2009 Equity Incentive Plan, a total of 363,081 shares are available for grant and issuance as of September 30, 2014. Under the 2003 Non-Employee Director Stock Option Plan, a total of 380,644 shares remain available for grant and issuance under the plan as of September 30, 2014. In addition, a total of 237,621 shares remain available for grant and issuance under Legacy ConnectOne equity plans. Options may be exercised with shares issued from Treasury shares, newly issued shares or a combination of both.Options have been granted to purchase common stock principally at the fair market value of the stock at the date of grant. Options are exercisable over a three-year vesting period starting one year after the date of grant and generally expire ten years from the date of grant.Stock-based compensation expense for share-based payment awards is based on the grant date fair value estimated on the date of grant. The Corporation recognizes compensation costs for those shares expected to vest on a straight-line basis over the requisite service period of the award, which is generally the option vesting term of three years. The Corporation estimates the forfeiture rate based on its historical experience during the preceding seven fiscal years.
Share Based Compensation Arrangement by Share Based Payment Award Number of Plans		2		2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Allocated Share-based Compensation Expense (in Dollars)				$ 51,000	$ 60,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross						18,829
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	37,110
Common Stock Underlying Grant Options		0	0	31,257	31,257
Restricted Stock [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Stock Issued During Period, Shares, Restricted Stock Award, Gross				52,467	18,829
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)		425,329		425,329
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 292 days
Employee Stock Option [Member]
Stock-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)		$ 0		$ 0
Minimum [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				30 days
Maximum [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				5 years
Employee Director Stock Option Plan 2009 [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		363,081		363,081
Non Employee Director Stock Option Plan 2003 Member
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		380,644		380,644
Legacy ConnectOne Equity Plan [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		237,621		237,621