Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 1,289,965us-gaap_CashAndDueFromBanks	$ 1,573,361us-gaap_CashAndDueFromBanks
Interest-bearing deposits at banks	6,470,867us-gaap_InterestBearingDepositsInBanks	1,651,138us-gaap_InterestBearingDepositsInBanks
Federal funds sold	83,392us-gaap_FederalFundsSold	99,573us-gaap_FederalFundsSold
Trading account	308,175us-gaap_TradingSecurities	376,131us-gaap_TradingSecurities
Investment securities (includes pledged securities that can be sold or repledged of $1,631,267 at December 31, 2014; $1,696,438 at December 31, 2013)
Available for sale (cost: $8,919,324 at December 31, 2014; $4,444,365 at December 31, 2013)	9,156,932us-gaap_AvailableForSaleSecurities	4,531,786us-gaap_AvailableForSaleSecurities
Held to maturity (fair value: $3,538,282 at December 31, 2014; $3,860,127 at December 31, 2013)	3,507,868us-gaap_HeldToMaturitySecurities	3,966,130us-gaap_HeldToMaturitySecurities
Other (fair value: $328,742 at December 31, 2014; $298,581 at December 31, 2013)	328,742	298,581
Total investment securities	12,993,542us-gaap_MarketableSecurities	8,796,497us-gaap_MarketableSecurities
Loans and leases	66,899,369	64,325,783
Unearned discount	(230,413)	(252,624)
Loans and leases, net of unearned discount	66,668,956	64,073,159
Allowance for credit losses	(919,562)	(916,676)
Loans and leases, net	65,749,394	63,156,483
Premises and equipment	612,984us-gaap_PropertyPlantAndEquipmentNet	633,520us-gaap_PropertyPlantAndEquipmentNet
Goodwill	3,524,625us-gaap_Goodwill	3,524,625us-gaap_Goodwill
Core deposit and other intangible assets	35,027us-gaap_FiniteLivedIntangibleAssetsNet	68,851us-gaap_FiniteLivedIntangibleAssetsNet
Accrued interest and other assets	5,617,564	5,282,212
Total assets	96,685,535us-gaap_Assets	85,162,391us-gaap_Assets
Liabilities
Noninterest-bearing deposits	26,947,880	24,661,007
NOW accounts	2,307,815	1,989,441
Savings deposits	41,085,803us-gaap_DepositsSavingsDeposits	36,621,580us-gaap_DepositsSavingsDeposits
Time deposits	3,063,973us-gaap_TimeDeposits	3,523,838us-gaap_TimeDeposits
Deposits at Cayman Islands office	176,582us-gaap_DepositsForeign	322,746us-gaap_DepositsForeign
Total deposits	73,582,053us-gaap_Deposits	67,118,612us-gaap_Deposits
Federal funds purchased and agreements to repurchase securities	192,676	260,455
Accrued interest and other liabilities	1,567,951us-gaap_OtherLiabilities	1,368,922us-gaap_OtherLiabilities
Long-term borrowings	9,006,959us-gaap_LongTermDebt	5,108,870us-gaap_LongTermDebt
Total liabilities	84,349,639us-gaap_Liabilities	73,856,859us-gaap_Liabilities
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 731,500 shares at December 31, 2014; 381,500 shares at December 31, 2013; Liquidation preference of $10,000 per share: 50,000 shares at December 31, 2014 and December 31, 2013	1,231,500us-gaap_PreferredStockValue	881,500us-gaap_PreferredStockValue
Common stock, $.50 par, 250,000,000 shares authorized, 132,312,931 shares issued at December 31, 2014; 130,516,364 shares issued at December 31, 2013	66,157us-gaap_CommonStockValue	65,258us-gaap_CommonStockValue
Common stock issuable, 41,330 shares at December 31, 2014; 47,231 shares at December 31, 2013	2,608mtb_CommonStockIssuable	2,915mtb_CommonStockIssuable
Additional paid-in capital	3,409,506us-gaap_AdditionalPaidInCapital	3,232,014us-gaap_AdditionalPaidInCapital
Retained earnings	7,807,119	7,188,004
Accumulated other comprehensive income (loss), net	(180,994)	(64,159)
Total shareholders' equity	12,335,896us-gaap_StockholdersEquity	11,305,532us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 96,685,535	$ 85,162,391

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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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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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