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Borrowings - Long-term Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Variable Rate Term Loans Due 2023 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2023 2023
3.55% Fixed Rate Due 2023 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2023 2023
Interest rate of debt instrument 3.55% 3.55%
4.55% fixed/variable due 2028 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2028 2028
Interest rate of debt instrument 4.55% 4.55%
7.41% fixed/variable due 2029 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2029 2029
Interest rate of debt instrument 7.41% 7.41%
5.05% fixed/variable due 2034 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2034 2034
Interest rate of debt instrument 5.05% 5.05%
Fixed Rate Term Loans 2.90% Due 2025 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2025 2025
Interest rate of debt instrument 2.90% 2.90%
Fixed Rate Term Loans 5.75% due 2024 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2024 2024
Interest rate of debt instrument 5.75% 5.75%
Fixed Rate Term Loans 5.40% due 2025 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2025 2025
Interest rate of debt instrument 5.40% 5.40%
Fixed Rate Term Loans 4.65% due 2026 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2026 2026
Interest rate of debt instrument 4.65% 4.65%
Fixed Rate Term Loans 4.70% due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2028 2028
Interest rate of debt instrument 4.70% 4.70%
4.00% due 2024 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2024 2024
Interest rate of debt instrument 4.00% 4.00%
3.40% due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2027 2027
Interest rate of debt instrument 3.40% 3.40%
BSB Capital Trust I - 8.125%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2028 2028
Interest rate of debt instrument 8.125% 8.125%
Provident Trust I - 8.29%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2028 2028
Interest rate of debt instrument 8.29% 8.29%
Southern Financial Statutory Trust I - 10.60%, due 2030 [Member]    
Schedule Of Borrowings [Line Items]    
Debt maturity date 2030 2030
Interest rate of debt instrument 10.60% 10.60%
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