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Revenue from Contracts with Customers - Summary of Sources of M&T's Noninterest Income that are Subject to the Amended Guidance (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation Of Revenue [Line Items]        
Brokerage services income $ 12,267 $ 14,676 $ 38,288 $ 48,677
Other revenues from operations:        
Total other income 459,294 459,429 1,375,404 1,367,090
Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 108,647 109,356 320,546 319,589
Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 133,545 $ 124,900 402,561 $ 371,712
ASU 2014-09 [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,267   38,288  
Other revenues from operations:        
Merchant discount and credit card fees 27,771   78,605  
Other 20,906   68,208  
Total other income 303,136   908,208  
ASU 2014-09 [Member] | Business Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 9,238   25,075  
Total other income 25,005   71,857  
ASU 2014-09 [Member] | Commercial Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 13,520   38,774  
Other 1,662   6,871  
Total other income 39,349   118,736  
ASU 2014-09 [Member] | Commercial Real Estate [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 643   1,625  
Other 1,822   4,896  
Total other income 4,839   14,110  
ASU 2014-09 [Member] | Discretionary Portfolio [Member]        
Other revenues from operations:        
Other 386   1,251  
Total other income 386   1,251  
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]        
Other revenues from operations:        
Other 916   2,886  
Total other income 918   2,894  
ASU 2014-09 [Member] | Retail Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 3,908   11,436  
Other 9,397   28,875  
Total other income 78,014   228,636  
ASU 2014-09 [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,267   38,288  
Other revenues from operations:        
Merchant discount and credit card fees 462   1,695  
Other 6,723   23,429  
Total other income 154,625   470,724  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 108,647   320,546  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Business Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 15,767   46,782  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 24,167   73,091  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Real Estate [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 2,374   7,589  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Residential Mortgage Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 2   8  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Retail Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 64,709   188,325  
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 1,628   4,751  
ASU 2014-09 [Member] | Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 133,545   402,561  
ASU 2014-09 [Member] | Trust Income [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer $ 133,545   $ 402,561