INVESTMENT SECURITIES (Details) - Investments classified by maturity date (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment Securities Available-for-Sale:
Due in one year or less	$ 12,903
Due in one year or less	13,054
Due after one year through five years	42,369
Due after one year through five years	43,670
Due after five years through ten years	93,793
Due after five years through ten years	98,615
Due after ten years	57,201
Due after ten years	57,592
Total	281,461	319,147
Total	289,532cnob_SecuritiesAvailableForSaleNet
Investment Securities Held-to-Maturity:
Due in one year or less	5,001
Due in one year or less	5,054
Due after one year through five years	9,211
Due after one year through five years	9,367
Due after five years through ten years	70,030
Due after five years through ten years	72,302
Due after ten years	130,219
Due after ten years	134,423
Total	224,682us-gaap_HeldToMaturitySecurities	215,286us-gaap_HeldToMaturitySecurities
Total	231,445	210,958
Total investment securities	506,143us-gaap_MarketableSecurities
Total investment securities	520,977
Residential Mortgage Backed Securities [Member]
Investment Securities Available-for-Sale:
Investment Securities Available-for-Sale: amortized cost	58,836
Investment Securities Available-for-Sale: fair value	60,356
Total	58,836	48,312
Investment Securities Held-to-Maturity:
Investment Securities Held-to-Maturity: amoritzed cost	5,955
Investment Securities Held-to-Maturity: fair value	5,983
Total	5,983	2,182
Commercial Mortgage Backed Securities [Member]
Investment Securities Available-for-Sale:
Investment Securities Available-for-Sale: amortized cost	3,042
Investment Securities Available-for-Sale: fair value	3,046
Total	3,042	7,145
Investment Securities Held-to-Maturity:
Investment Securities Held-to-Maturity: amoritzed cost	4,266
Investment Securities Held-to-Maturity: fair value	4,316
Total	4,316	4,396
Equity Securities [Member]
Investment Securities Available-for-Sale:
Investment Securities Available-for-Sale: amortized cost	376
Investment Securities Available-for-Sale: fair value	307
Total	376	376
Other Securities [Member]
Investment Securities Available-for-Sale:
Investment Securities Available-for-Sale: amortized cost	12,941
Investment Securities Available-for-Sale: fair value	12,892
Total	$ 12,941	$ 5,671

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