CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 336,470us-gaap_CashAndDueFromBanks	$ 183,227us-gaap_CashAndDueFromBanks
Due from banks - interest-bearing	119,981us-gaap_InterestBearingDepositsInBanks	552,719us-gaap_InterestBearingDepositsInBanks
Federal funds sold and securities purchased under resale agreements	200,000	200,000
Securities available-for-sale - cost $5,894,509 and $6,267,691 at December 31, 2014 and December 31, 2013, respectively:
Securities pledged as collateral	14,654	12,376
Held in portfolio	5,868,329	6,228,741
Securities held-to-maturity - fair value $3,484,647 and 2,883,935 at December 31, 2014 and December 31, 2013, respectively
Securities pledged as collateral	521,262
Held in portfolio	2,905,769	2,957,843
Trading securities	173,188us-gaap_TradingSecurities	82,357us-gaap_TradingSecurities
Loans and leases, excluding covered loans	20,337,206	17,170,438
Less: Allowance for loan and lease losses	310,149	302,584
Loans and leases, excluding covered loans, net	20,027,057	16,867,854
Covered loans, net of allowance for loan losses	502,371	700,989
Net loans and leases	20,529,428	17,568,843
Premises and equipment, net	207,700us-gaap_PropertyPlantAndEquipmentNet	198,398us-gaap_PropertyPlantAndEquipmentNet
Deferred tax asset	230,376us-gaap_DeferredTaxAssetsLiabilitiesNet	217,990us-gaap_DeferredTaxAssetsLiabilitiesNet
Goodwill	635,868us-gaap_Goodwill	642,622us-gaap_Goodwill
Customer-relationship intangibles, net	34,831	40,621
Affordable housing investments	203,010cyn_AffordableHousingInvestments	188,207cyn_AffordableHousingInvestments
Customers' acceptance liability	17,664us-gaap_DueFromCustomerAcceptances	10,521us-gaap_DueFromCustomerAcceptances
Other real estate owned ($12,760 and $25,481 covered by FDIC loss share at December 31, 2014 and December 31, 2013, respectively)	23,496	38,092
FDIC indemnification asset	50,511us-gaap_FDICIndemnificationAsset	89,227us-gaap_FDICIndemnificationAsset
Other assets	537,826us-gaap_OtherAssets	506,167us-gaap_OtherAssets
Total assets	32,610,363us-gaap_Assets	29,717,951us-gaap_Assets
Liabilities
Demand deposits	18,030,021us-gaap_DemandDepositAccounts	16,058,968us-gaap_DemandDepositAccounts
Interest checking deposits	2,736,391	2,467,890
Money market deposits	6,198,798us-gaap_DepositsMoneyMarketDeposits	6,022,457us-gaap_DepositsMoneyMarketDeposits
Savings deposits	469,931us-gaap_DepositsSavingsDeposits	441,521us-gaap_DepositsSavingsDeposits
Time deposits-under $100,000	155,568us-gaap_TimeDepositsLessThan100000	176,488us-gaap_TimeDepositsLessThan100000
Time deposits-$100,000 and over	517,394us-gaap_TimeDeposits100000OrMore	512,113us-gaap_TimeDeposits100000OrMore
Total deposits	28,108,103us-gaap_Deposits	25,679,437us-gaap_Deposits
Short-term borrowings	322,861us-gaap_DebtCurrent	3,889us-gaap_DebtCurrent
Long-term debt	638,600us-gaap_LongTermDebt	735,968us-gaap_LongTermDebt
Reserve for off-balance sheet credit commitments	27,811	33,944
Acceptances outstanding	17,664	10,521
Other liabilities	499,514us-gaap_OtherLiabilities	473,438us-gaap_OtherLiabilities
Total liabilities	29,614,553us-gaap_Liabilities	26,937,197us-gaap_Liabilities
Redeemable noncontrolling interest	39,978	39,768
Commitments and contingencies
Shareholders' Equity
Preferred stock, par value $1.00 per share; 5,000,000 shares authorized; 275,000 shares issued at December 31, 2014 and December 31, 2013, respectively	267,616us-gaap_PreferredStockValue	267,616us-gaap_PreferredStockValue
Common stock, par value $1.00 per share; 75,000,000 shares authorized; 55,162,455 and 54,667,295 shares issued at December 31, 2014 and December 31, 2013, respectively	55,162us-gaap_CommonStockValue	54,667us-gaap_CommonStockValue
Additional paid-in capital	578,046us-gaap_AdditionalPaidInCapital	541,210us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss	(7,074)	(15,641)
Retained earnings	2,084,361	1,918,163
Treasury shares, at cost - 377,224 and 483,523 shares at December 31, 2014 and December 31, 2013, respectively	(22,279)us-gaap_TreasuryStockValue	(25,029)us-gaap_TreasuryStockValue
Total common shareholders' equity	2,688,216cyn_CommonStockholderEquity	2,473,370cyn_CommonStockholderEquity
Total shareholders' equity	2,955,832	2,740,986
Total liabilities and shareholders' equity	$ 32,610,363	$ 29,717,951

Investments in entities formed to provide affordable housing.

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Items including common stock value, paid in capital, retained earnings, common stock purchased for the treasury and excluding noncontrolling interests (minority interests) and preferred stockholders interests.

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Represents investments in debt securities classified as held-to-maturity and excludes securities that are pledged as collateral for borrowings, whereby the secured party has the right by contract or custom to sell or re-pledge the collateral.

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No definition available.

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Accrued liability to reflect exposure relating to off-balance sheet items such as commitments to extend credit, banker's acceptances and standby letters of credit.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

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Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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Amounts receivable from customers on short-term negotiable time drafts drawn on and accepted by the institution (also known as banker's acceptance transactions) that are outstanding on the reporting date.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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No definition available.

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Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Net carrying amount of loans and leases receivable covered by loss sharing agreements.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

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The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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