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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) loan commitment | Dec. 31, 2022 USD ($) commitment loan | Dec. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Accrued interest | $ 88,200,000 | $ 95,000,000 |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable | Accrued interest receivable |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | $ 14,311,987,000 | $ 12,726,456,000 |  |
Loans held for sale, average life from purchase to sale (days) | 30 days |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | $ 136,775,000 | 135,311,000 | $ 130,924,000 | $ 137,804,000
Allowance for credit loss, period increase | 1,500,000 | 4,400,000 |  |
Number of commitments to lend additional funds (commitment) | $ 0 |  |  |
Loans reported as TDR |  | $ 16,800,000 |  |
Minimum performance requirement (months) |  | 6 months |  |
Contractual terms for loans (months) | 6 months |  |  |
Troubled debt restructurings |  | $ 0 | $ 0 |
Number of loans | loan |  | 259 |  |
Commitments to lend additional funds to debtors | commitment |  | 0 | 0 |
Loans receivable, PPP | $ 22,800,000 | $ 74,700,000 |  |
Loans and leases receivable | 13,127,634,000 | 11,963,855,000 |  |
Purchases | 198,393,000 | $ 757,188,000 | $ 483,980,000 |
Debt Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | loan |  | 0 | 0 |
Asset Pledged as Collateral |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases receivable | 8,000,000,000.0 | $ 7,000,000,000.0 |  |
Troubled Debt Restructurings |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Contractual terms for loans (months) |  | 9 months |  |
Other commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Purchases | 9,019,000 | $ 22,073,000 | $ 2,975,000 |
Commercial Real Estate | Other commercial and industrial | Collateral-dependent loans |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | $ 31,900,000 | $ 15,800,000 |  |

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