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Borrowings - Long-term Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Borrowings [Line Items]    
Debt Maturity, Start Date Jan. 01, 2027  
Debt Maturity, End Date Dec. 31, 2033  
Variable Rate Due 2016 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2016 2016
Senior Notes Due 2017 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2017 2017
1.25% Due 2017 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 1.25% 1.25%
Debt maturity date 2017 2017
1.40% Due 2017 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 1.40% 1.40%
Debt maturity date 2017 2017
1.45% Due 2018 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 1.45% 1.45%
Debt maturity date 2018 2018
2.25% Due 2019 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 2.25% 2.25%
Debt maturity date 2019 2019
2.30% Due 2019 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 2.30% 2.30%
Debt maturity date 2019 2019
2.10% Due 2020 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 2.10% 2.10%
Debt maturity date 2020 2020
2.90% Due 2025 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 2.90% 2.90%
Debt maturity date 2025 2025
8.5% due 2018 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 8.50% 8.50%
Debt maturity date 2018 2018
6.625% due 2017 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 6.625% 6.625%
Debt maturity date 2017 2017
5.585% due 2020, Variable Rate Commenced 2015 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 5.585% 5.585%
Debt Maturity, Start Date Jan. 01, 2015 Jan. 01, 2015
Debt Maturity, End Date Dec. 31, 2020 Dec. 31, 2020
5.629% due 2021, Variable Rate Commencing 2016 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 5.629% 5.629%
Debt Maturity, Start Date Jan. 01, 2016 Jan. 01, 2016
Debt Maturity, End Date Dec. 31, 2021 Dec. 31, 2021
M&T Capital Trust I - 8.234%, due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 8.234% 8.234%
Debt maturity date 2027 2027
M&T Capital Trust II - 8.277%, due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 8.277% 8.277%
Debt maturity date 2027 2027
M&T Capital Trust III - 9.25%, due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 9.25% 9.25%
Debt maturity date 2027 2027
BSB Capital Trust I - 8.125%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 8.125% 8.125%
Debt maturity date 2028 2028
Provident Trust I - 8.29%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 8.29% 8.29%
Debt maturity date 2028 2028
Southern Financial Statutory Trust I - 10.60%, due 2030 [Member]    
Schedule Of Borrowings [Line Items]    
Interest rate of debt instrument 10.60% 10.60%
Debt maturity date 2030 2030
First Maryland Capital I - due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2027 2027
First Maryland Capital II - due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2027 2027
Allfirst Asset Trust - due 2029 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2029 2029
BSB Capital Trust III - due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2033 2033
Provident Statutory Trust III - Due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2033 2033
Southern Financial Capital Trust III - due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2033 2033