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Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Common stock per share dividend amount $ 0.70us-gaap_CommonStockDividendsPerShareCashPaid $ 0.70us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock [Member] | Series A Warrants [Member]    
Exercise of warrants into shares of common stock 2,315us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= mtb_SeriesAWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise of warrants into shares of common stock 904us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_ClassOfWarrantOrRightAxis
= mtb_SeriesAWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Retained Earnings [Member]    
Common stock per share dividend amount $ 0.70us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.70us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember