XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.25.1

Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | $ 5,267,000 |  | $ 19,234,000
Year two |  | 17,723,000 |  | 15,083,000
Year three |  | 14,213,000 |  | 17,786,000
Year four |  | 17,002,000 |  | 11,704,000
Year five |  | 11,034,000 |  | 8,328,000
Prior |  | 35,500,000 |  | 28,783,000
Total (a) (b) | [1] | 134,574,000 |  | 135,581,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Year one |  | 1,000 |  |
Year two |  | 17,000 |  |
Year three |  | 22,000 |  |
Year four |  | 20,000 |  |
Year five |  | 12,000 |  |
Prior |  | 44,000 |  |
Total |  | 160,000 | $ 163,000 |
Commercial and industrial |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 2,251,000 |  | 9,221,000
Year two |  | 8,513,000 |  | 6,895,000
Year three |  | 6,271,000 |  | 6,345,000
Year four |  | 5,961,000 |  | 3,509,000
Year five |  | 3,147,000 |  | 1,668,000
Prior |  | 7,332,000 |  | 5,895,000
Revolving Loans |  | 26,973,000 |  | 27,815,000
Revolving Loans Converted to Term Loans |  | 148,000 |  | 133,000
Total (a) (b) |  | 60,596,000 |  | 61,481,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Year one |  | 0 |  |
Year two |  | 3,000 |  |
Year three |  | 8,000 |  |
Year four |  | 9,000 |  |
Year five |  | 2,000 |  |
Prior |  | 5,000 |  |
Revolving Loans |  | 23,000 |  |
Revolving Loans Converted to Term Loans |  | 0 |  |
Total |  | 50,000 |  |
Commercial and industrial | Pass |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 2,222,000 |  | 9,021,000
Year two |  | 8,230,000 |  | 6,454,000
Year three |  | 5,812,000 |  | 5,845,000
Year four |  | 5,456,000 |  | 3,258,000
Year five |  | 2,918,000 |  | 1,534,000
Prior |  | 6,474,000 |  | 5,147,000
Revolving Loans |  | 25,358,000 |  | 26,262,000
Revolving Loans Converted to Term Loans |  | 94,000 |  | 79,000
Total (a) (b) |  | 56,564,000 |  | 57,600,000
Commercial and industrial | Criticized accrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 29,000 |  | 189,000
Year two |  | 272,000 |  | 385,000
Year three |  | 393,000 |  | 402,000
Year four |  | 403,000 |  | 210,000
Year five |  | 188,000 |  | 75,000
Prior |  | 588,000 |  | 528,000
Revolving Loans |  | 1,461,000 |  | 1,359,000
Revolving Loans Converted to Term Loans |  | 36,000 |  | 37,000
Total (a) (b) |  | 3,370,000 |  | 3,185,000
Commercial and industrial | Criticized nonaccrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 11,000
Year two |  | 11,000 |  | 56,000
Year three |  | 66,000 |  | 98,000
Year four |  | 102,000 |  | 41,000
Year five |  | 41,000 |  | 59,000
Prior |  | 270,000 |  | 220,000
Revolving Loans |  | 154,000 |  | 194,000
Revolving Loans Converted to Term Loans |  | 18,000 |  | 17,000
Total (a) (b) |  | 662,000 |  | 696,000
Commercial Real Estate |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Total |  | 22,000 | $ 25,000 |
Commercial Real Estate | Commercial |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 538,000 |  | 714,000
Year two |  | 442,000 |  | 1,867,000
Year three |  | 1,845,000 |  | 2,076,000
Year four |  | 1,925,000 |  | 1,501,000
Year five |  | 1,500,000 |  | 2,382,000
Prior |  | 13,391,000 |  | 11,819,000
Revolving Loans |  | 455,000 |  | 421,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 20,096,000 |  | 20,780,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Year one |  | 0 |  |
Year two |  | 0 |  |
Year three |  | 0 |  |
Year four |  | 0 |  |
Year five |  | 0 |  |
Prior |  | 22,000 |  |
Revolving Loans |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  |
Total |  | 22,000 |  |
Commercial Real Estate | Commercial | Pass |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 538,000 |  | 674,000
Year two |  | 402,000 |  | 1,477,000
Year three |  | 1,492,000 |  | 1,358,000
Year four |  | 1,310,000 |  | 1,222,000
Year five |  | 1,196,000 |  | 1,774,000
Prior |  | 11,051,000 |  | 9,611,000
Revolving Loans |  | 447,000 |  | 413,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 16,436,000 |  | 16,529,000
Commercial Real Estate | Commercial | Criticized accrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 39,000
Year two |  | 39,000 |  | 389,000
Year three |  | 352,000 |  | 665,000
Year four |  | 560,000 |  | 253,000
Year five |  | 279,000 |  | 591,000
Prior |  | 2,029,000 |  | 1,839,000
Revolving Loans |  | 7,000 |  | 7,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 3,266,000 |  | 3,783,000
Commercial Real Estate | Commercial | Criticized nonaccrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 1,000
Year two |  | 1,000 |  | 1,000
Year three |  | 1,000 |  | 53,000
Year four |  | 55,000 |  | 26,000
Year five |  | 25,000 |  | 17,000
Prior |  | 311,000 |  | 369,000
Revolving Loans |  | 1,000 |  | 1,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 394,000 |  | 468,000
Commercial Real Estate | Residential builder and developer |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 125,000 |  | 396,000
Year two |  | 346,000 |  | 278,000
Year three |  | 193,000 |  | 74,000
Year four |  | 71,000 |  | 12,000
Year five |  | 11,000 |  | 4,000
Prior |  | 14,000 |  | 11,000
Revolving Loans |  | 66,000 |  | 60,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 826,000 |  | 835,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Year one |  | 0 |  |
Year two |  | 0 |  |
Year three |  | 0 |  |
Year four |  | 0 |  |
Year five |  | 0 |  |
Prior |  | 0 |  |
Revolving Loans |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  |
Total |  | 0 |  |
Commercial Real Estate | Residential builder and developer | Pass |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 124,000 |  | 380,000
Year two |  | 327,000 |  | 236,000
Year three |  | 171,000 |  | 40,000
Year four |  | 41,000 |  | 12,000
Year five |  | 11,000 |  | 4,000
Prior |  | 14,000 |  | 10,000
Revolving Loans |  | 66,000 |  | 60,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 754,000 |  | 742,000
Commercial Real Estate | Residential builder and developer | Criticized accrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 1,000 |  | 15,000
Year two |  | 18,000 |  | 42,000
Year three |  | 22,000 |  | 34,000
Year four |  | 30,000 |  | 0
Year five |  | 0 |  | 0
Prior |  | 0 |  | 0
Revolving Loans |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 71,000 |  | 91,000
Commercial Real Estate | Residential builder and developer | Criticized nonaccrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 1,000
Year two |  | 1,000 |  | 0
Year three |  | 0 |  | 0
Year four |  | 0 |  | 0
Year five |  | 0 |  | 0
Prior |  | 0 |  | 1,000
Revolving Loans |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 1,000 |  | 2,000
Commercial Real Estate | Other commercial construction |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 4,000 |  | 150,000
Year two |  | 167,000 |  | 1,499,000
Year three |  | 1,534,000 |  | 1,795,000
Year four |  | 1,727,000 |  | 648,000
Year five |  | 523,000 |  | 472,000
Prior |  | 945,000 |  | 540,000
Revolving Loans |  | 45,000 |  | 45,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 4,945,000 |  | 5,149,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |
Year one |  | 0 |  |
Year two |  | 0 |  |
Year three |  | 0 |  |
Year four |  | 0 |  |
Year five |  | 0 |  |
Prior |  | 0 |  |
Revolving Loans |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  |
Total |  | 0 |  |
Commercial Real Estate | Other commercial construction | Pass |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 4,000 |  | 108,000
Year two |  | 165,000 |  | 1,395,000
Year three |  | 1,407,000 |  | 1,091,000
Year four |  | 982,000 |  | 269,000
Year five |  | 213,000 |  | 175,000
Prior |  | 500,000 |  | 379,000
Revolving Loans |  | 39,000 |  | 42,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 3,310,000 |  | 3,459,000
Commercial Real Estate | Other commercial construction | Criticized accrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 42,000
Year two |  | 2,000 |  | 104,000
Year three |  | 126,000 |  | 687,000
Year four |  | 729,000 |  | 346,000
Year five |  | 309,000 |  | 297,000
Prior |  | 435,000 |  | 145,000
Revolving Loans |  | 6,000 |  | 3,000
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | 1,607,000 |  | 1,624,000
Commercial Real Estate | Other commercial construction | Criticized nonaccrual |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Year one |  | 0 |  | 0
Year two |  | 0 |  | 0
Year three |  | 1,000 |  | 17,000
Year four |  | 16,000 |  | 33,000
Year five |  | 1,000 |  | 0
Prior |  | 10,000 |  | 16,000
Revolving Loans |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0
Total (a) (b) |  | $ 28,000 |  | $ 66,000
[1] | Loans and leases of $2.1 billion and $1.5 billion at March 31, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes were included in Long-term borrowings and were $1.8 billion at March 31, 2025 and $1.2 billion at December 31, 2024.

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=mtb_CriticizedAccrualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=mtb_CriticizedNonaccrualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_ResidentialBuilderAndDeveloperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_OtherCommercialConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |