QUARTERLY FINANCIAL INFORMATION OF CONNECTONE BANCORP, INC. (UNAUDITED) (Details) - Schedule of Quarterly Financial Information (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Quarterly Financial Information [Abstract]
Total interest income	$ 33,130	$ 32,343	$ 14,401	$ 14,337	$ 14,644	$ 14,541	$ 13,979	$ 14,104			$ 94,207	$ 57,268	$ 55,272
Total interest expense	4,550	4,797	2,733	2,727	2,778	2,819	2,751	2,734			14,808	11,082	11,776
Net interest income	28,580	27,546	11,668	11,610	11,866	11,722	11,228	11,370			79,399	46,186	43,496
Provision for loan losses	2,474	1,300	284	625	350				4,683	325	4,683	350	325
Total other income, net of securities gains	1,358	1,062	1,150	1,106	1,307	1,200	1,107	1,526
Net securities gains	718	111	574	1,415	449	343	600	319			2,818	1,711	2,012
Other expense	15,164	25,400	6,744	7,496	6,459	6,205	6,076	6,538
Income before income taxes	13,018	2,019	6,364	6,010	6,813	7,060	6,859	6,677			27,410	27,409	25,184
Provision from income taxes	4,995	253	1,986	1,612	1,829	1,966	1,936	1,753
Net income	8,023	1,766	4,378	4,398	4,984	5,094	4,923	4,924			18,565	19,925	17,507
Net income available to common stockholders	$ 7,995	$ 1,738	$ 4,350	$ 4,370	$ 4,955	$ 5,066	$ 4,895	$ 4,868			$ 18,453	$ 19,784	$ 17,226
Earnings per share:
Basic (in Dollars per share)	$ 0.27	$ 0.06	$ 0.27	$ 0.27	$ 0.30	$ 0.31	$ 0.30	$ 0.30			$ 0.80	$ 1.21	$ 1.05
Diluted (in Dollars per share)	$ 0.27	$ 0.06	$ 0.26	$ 0.27	$ 0.30	$ 0.31	$ 0.30	$ 0.30			$ 0.79	$ 1.21	$ 1.05
Weighted average common shares outstanding:
Basic (in Shares)	29,699,301	29,636,001	16,372,885	16,350,183	16,350,183	16,349,480	16,348,915	16,348,215			23,029,813	16,349,204	16,340,197
Diluted (in Shares)	30,149,244	30,108,103	16,430,376	16,405,540	16,396,931	16,385,155	16,375,774	16,373,588			23,479,074	16,385,692	16,351,046