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Borrowings - Long-term Borrowings (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Borrowings [Line Items]    
Fixed rates advances from FHLB $ 1,815 $ 576,446
Agreements to repurchase securities 101,679 409,154
Other 8,533 35,174
Long-term borrowings 6,986,186 8,444,914
Variable Rate Term Loans Due 2023 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 249,756 249,688
Variable Rate Term Loans Due 2021 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 349,893 349,794
3.55% Fixed Rate Due 2023 [Member] | M&T Bank Corporation [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 520,454 506,021
Variable Rate Term Loans Due 2022 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 249,758 249,658
Fixed Rate Term Loans 2.25% Due 2019 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount   645,801
Fixed Rate Term Loans 2.05% Due 2020 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 749,254 737,793
Fixed Rate Term Loans 2.10% Due 2020 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 749,864 741,965
Fixed Rate Term Loans 2.625% Due 2021 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 654,136 646,301
Fixed Rate Term Loans 2.50% Due 2022 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 652,714 634,525
Fixed Rate Term Loans 2.90% Due 2025 [Member]    
Schedule Of Borrowings [Line Items]    
Variable\fixed rates term loan amount 749,572 749,488
Variable Rate Due 2020 [Member]    
Schedule Of Borrowings [Line Items]    
Subordinated notes 409,361 409,361
Variable Rate Due 2021 [Member]    
Schedule Of Borrowings [Line Items]    
Subordinated notes 500,000 500,000
3.40% due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Subordinated notes 514,353 481,692
BSB Capital Trust I - 8.125%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 15,728 15,705
Provident Trust I - 8.29%, due 2028 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 28,235 27,489
Southern Financial Statutory Trust I - 10.60%, due 2030 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 6,770 6,713
First Maryland Capital I - due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 147,871 147,333
First Maryland Capital II - due 2027 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 149,943 149,280
Allfirst Asset Trust - due 2029 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 96,930 96,785
BSB Capital Trust III - due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 15,464 15,464
Provident Statutory Trust III - Due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities 55,867 55,143
Southern Financial Capital Trust III - due 2033 [Member]    
Schedule Of Borrowings [Line Items]    
Junior subordinated debentures associated with preferred capital securities $ 8,236 $ 8,141