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Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Jan. 01, 2024 | Jan. 01, 2023
--- | --- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | $ 1,540,000 | $ 1,690,000 | $ 2,302,000 | $ 1,690,000 | $ 2,166,000
Total (a) (b) | [1] | 134,574,000 | 135,581,000 |  |  |
Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 131,203,000 | 131,898,000 |  |  |
30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 1,447,000 | 1,655,000 |  |  |
Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 384,000 | 338,000 |  |  |
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 662,000 | 696,000 | 864,000 | 696,000 | 670,000
Total (a) (b) |  | 60,596,000 | 61,481,000 |  |  |
Commercial and industrial | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 59,671,000 | 60,374,000 |  |  |
Commercial and industrial | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 256,000 | 399,000 |  |  |
Commercial and industrial | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 7,000 | 12,000 |  |  |
Commercial Real Estate | Commercial |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 394,000 | 468,000 | 855,000 | 468,000 | 869,000
Total (a) (b) |  | 20,096,000 | 20,780,000 |  |  |
Commercial Real Estate | Commercial | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 19,351,000 | 20,054,000 |  |  |
Commercial Real Estate | Commercial | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 351,000 | 255,000 |  |  |
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 3,000 |  |  |
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 1,000 | 2,000 | 3,000 | 2,000 | 3,000
Total (a) (b) |  | 826,000 | 835,000 |  |  |
Commercial Real Estate | Residential builder and developer | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 819,000 | 830,000 |  |  |
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 6,000 | 3,000 |  |  |
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 0 |  |  |
Commercial Real Estate | Other commercial construction |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 28,000 | 66,000 | 141,000 | 66,000 | 171,000
Total (a) (b) |  | 4,945,000 | 5,149,000 |  |  |
Commercial Real Estate | Other commercial construction | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 4,867,000 | 5,018,000 |  |  |
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 50,000 | 65,000 |  |  |
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 0 |  |  |
Residential Real Estate | Residential |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 284,000 | 279,000 | 255,000 | 279,000 | 270,000
Total (a) (b) |  | 23,284,000 | 23,166,000 |  |  |
Residential Real Estate | Residential | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 22,053,000 | 21,853,000 |  |  |
Total (a) (b) |  | 22,053,000 | 21,853,000 |  |  |
Residential Real Estate | Residential | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 579,000 | 719,000 |  |  |
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 368,000 | 315,000 |  |  |
Total (a) (b) |  | 368,000 | 315,000 |  |  |
Consumer: | Home equity lines and loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 78,000 | 81,000 | 87,000 | 81,000 | 81,000
Total (a) (b) |  | 4,556,000 | 4,592,000 |  |  |
Consumer: | Home equity lines and loans | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 4,450,000 | 4,482,000 |  |  |
Total (a) (b) |  | 4,450,000 | 4,482,000 |  |  |
Consumer: | Home equity lines and loans | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 28,000 | 29,000 |  |  |
Consumer: | Home equity lines and loans | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 0 |  |  |
Total (a) (b) |  | 0 | 0 |  |  |
Consumer: | Recreational finance |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 26,000 | 31,000 | 30,000 | 31,000 | 36,000
Total (a) (b) |  | 12,913,000 | 12,564,000 |  |  |
Consumer: | Recreational finance | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 12,794,000 | 12,429,000 |  |  |
Total (a) (b) |  | 12,794,000 | 12,429,000 |  |  |
Consumer: | Recreational finance | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 93,000 | 104,000 |  |  |
Consumer: | Recreational finance | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 0 |  |  |
Total (a) (b) |  | 0 | 0 |  |  |
Consumer: | Automobile |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 11,000 | 12,000 | 13,000 | 12,000 | 14,000
Total (a) (b) |  | 5,127,000 | 4,794,000 |  |  |
Consumer: | Automobile | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 5,064,000 | 4,724,000 |  |  |
Total (a) (b) |  | 5,064,000 | 4,724,000 |  |  |
Consumer: | Automobile | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 52,000 | 58,000 |  |  |
Consumer: | Automobile | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 0 | 0 |  |  |
Total (a) (b) |  | 0 | 0 |  |  |
Consumer: | Other |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Amortized Cost |  | 56,000 | 55,000 | $ 54,000 | $ 55,000 | $ 52,000
Total (a) (b) |  | 2,231,000 | 2,220,000 |  |  |
Consumer: | Other | Current |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 2,134,000 | 2,134,000 |  |  |
Consumer: | Other | 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | 32,000 | 23,000 |  |  |
Consumer: | Other | Accruing Loans Past Due 90 Days or More |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans |  | $ 9,000 | $ 8,000 |  |  |
[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.

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