Long-term debt	9 Months Ended
Sep. 30, 2011
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	Long-term debt At September 30, 2011, long-term debt included a $5 million, 5% senior note due in February 2022 issued under a Credit Agreement (as defined below). Interest is payable quarterly for the first ten years and payable thereafter at a fixed rate based on the yield of the ten-year U.S. Treasury note plus 150 basis points in effect on the tenth anniversary of the note agreement. Quarterly principal payments of $250,000 commence in the eleventh year of the loan. As an additional condition for receiving the loan, the Bank is required to contribute $100,000 annually for the first five years the loan is outstanding to a nonprofit lending institution formed jointly by CNB and the lender to provide financing to small businesses that would not qualify for bank loans. On November 3, 2010, the Corporation entered into a First Amendment to Credit Agreement (the “Amendment”) with The Prudential Insurance Company of America (“Prudential”) amending and modifying that certain Credit Agreement by and between the Corporation and Prudential, dated as of February 21, 2007 (the “Credit Agreement”). The purpose of the Amendment was to: (a) modify the use of proceeds provisions of the Credit Agreement governing Prudential's $5,000,000 unsecured term loan to the Corporation so that the Corporation could convert its $5,000,000 subordinated loan to the Bank into equity of the Bank that will be treated by the OCC as “Tier I” regulatory capital; (b) waive certain events of default resulting from the Bank's entry into the Formal Agreement with the OCC and failure to meet certain other material obligations, including deferral of dividends to its Series F and G preferred stockholders and deferral of certain obligations to holders of debentures related to its trust preferred securities; (c) waive any default interest that may have accrued during the pendency of such events of default; and (d) amend and restate the financial covenants of the Credit Agreement. On November 30, 2010, upon receipt of OCC approval the subordinated loan was converted into equity, thereby increasing the Bank's Tier 1 leverage capital. However, as a result of the Consent Order entered into on December 22, 2010 and the failure to achieve certain capital ratios required by the OCC, the Corporation was once again in default under this loan and is attempting to obtain a waiver from the lender. As a result of the default, the loan has been reclassified to short-term portion of long-term debt on the accompanying Consolidated Balance Sheets. The Corporation has been in violation of certain covenants of the loan agreement. Although the loan becomes immediately payable as a result of these violations, which are considered an event of default, the lender has informally indicated that no action will be taken as a result of these violations.

Long-term debt

At September 30, 2011, long-term debt included a $5 million, 5% senior note due in February 2022 issued under a Credit Agreement (as defined below). Interest is payable quarterly for the first ten years and payable thereafter at a fixed rate based on the yield of the ten-year U.S. Treasury note plus 150 basis points in effect on the tenth anniversary of the note agreement. Quarterly principal payments of $250,000 commence in the eleventh year of the loan. As an additional condition for receiving the loan, the Bank is required to contribute $100,000 annually for the first five years the loan is outstanding to a nonprofit lending institution formed jointly by CNB and the lender to provide financing to small businesses that would not qualify for bank loans.

On November 3, 2010, the Corporation entered into a First Amendment to Credit Agreement (the “Amendment”) with The Prudential Insurance Company of America (“Prudential”) amending and modifying that certain Credit Agreement by and between the Corporation and Prudential, dated as of February 21, 2007 (the “Credit Agreement”).

The purpose of the Amendment was to: (a) modify the use of proceeds provisions of the Credit Agreement governing Prudential's $5,000,000 unsecured term loan to the Corporation so that the Corporation could convert its $5,000,000 subordinated loan to the Bank into equity of the Bank that will be treated by the OCC as “Tier I” regulatory capital; (b) waive certain events of default resulting from the Bank's entry into the Formal Agreement with the OCC and failure to meet certain other material obligations, including deferral of dividends to its Series F and G preferred stockholders and deferral of certain obligations to holders of debentures related to its trust preferred securities; (c) waive any default interest that may have accrued during the pendency of such events of default; and (d) amend and restate the financial covenants of the Credit Agreement. On November 30, 2010, upon receipt of OCC approval the subordinated loan was converted into equity, thereby increasing the Bank's Tier 1 leverage capital. However, as a result of the Consent Order entered into on December 22, 2010 and the failure to achieve certain capital ratios required by the OCC, the Corporation was once again in default under this loan and is attempting to obtain a waiver from the lender. As a result of the default, the loan has been reclassified to short-term portion of long-term debt on the accompanying Consolidated Balance Sheets.

The Corporation has been in violation of certain covenants of the loan agreement. Although the loan becomes immediately payable as a result of these violations, which are considered an event of default, the lender has informally indicated that no action will be taken as a result of these violations.