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Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income available to common equity $ 221,295mtb_NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment $ 214,343mtb_NetIncomeLossAvailableToCommonStockholdersDilutedBeforeUnvestedStockBasedCompensationAwardsAdjustment
Less: Income attributable to unvested stock-based compensation awards (2,458)mtb_IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted (2,612)mtb_IncomeAttributableToUnvestedStockBasedCompensationAwardsDiluted
Net income available to common shareholders $ 218,837us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 211,731us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Adjusted weighted-average shares outstanding:    
Common and unvested stock-based compensation awards 133,542mtb_CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards 131,800mtb_CommonSharesOutstandingIncludingCommonStockIssuableAndUnvestedStockBasedCompensationAwards
Less: Unvested stock-based compensation awards (1,493)mtb_UnvestedStockBasedCompensationAwards (1,588)mtb_UnvestedStockBasedCompensationAwards
Plus: Incremental shares from assumed conversion of stock-based compensation awards 720us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 914us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted-average shares outstanding 132,769us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 131,126us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share $ 1.65us-gaap_EarningsPerShareDiluted $ 1.61us-gaap_EarningsPerShareDiluted