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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 15, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) loan commitment | Dec. 31, 2021 USD ($) commitment loan | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Accrued interest |  | $ 95,000,000 | $ 105,500,000 |  |
Financing receivable, excluding accrued interest, after allowance for credit loss |  | $ 12,726,456,000 | 15,335,435,000 |  |
Loans held for sale, average life from purchase to sale (days) |  | 30 days |  |  |
Loans and leases receivable |  | $ 11,889,120,000 | 13,144,894,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | 135,311,000 | 130,924,000 | $ 137,804,000 | $ 144,176,000
Allowance for credit loss, period increase (decrease) |  | 4,400,000 | (6,900,000) |  |
Charge-offs |  | 95,066,000 | 77,196,000 | 40,381,000 |
Loans reported as TDR |  |  | 16,800,000 | 16,500,000 |
Number of commitments to lend additional funds (commitment) |  | $ 3,000,000 |  |  |
Troubled debt restructurings |  |  | $ 0 | $ 0 |
Minimum performance requirement (months) |  |  | 6 months |  |
Contractual terms for loans (months) |  | 6 months |  |  |
Number of loans | loan |  |  | 259 | 202 |
Commitments to lend additional funds to debtors | commitment |  |  | 0 | 0 |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Accrued interest receivable | Accrued interest receivable |  |
Purchases |  | $ 757,188,000 | $ 483,980,000 | $ 1,907,222,000 |
Amount at par value of financing receivable purchased with credit deterioration | $ 228,700,000 |  |  |  |
Asset Pledged as Collateral |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable |  | 7,000,000,000 | $ 7,100,000,000 |  |
Troubled Debt Restructurings |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Contractual terms for loans (months) |  |  | 9 months |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable |  | 74,700,000 | $ 998,200,000 |  |
Interest income |  | 26,600,000 | 79,400,000 | 279,200,000 |
Charge-offs |  | 10,700,000 | 11,000,000 |  |
Specialty lending | FDIC |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Purchases | 631,000,000 |  |  |  |
Amount at par value of financing receivable purchased with credit deterioration | $ 228,700,000 |  |  |  |
Other commercial and industrial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Purchases |  | 22,073,000 | 2,975,000 | 0 |
Commercial real estate non-owner occupied |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Amount deferred, CARES Act |  |  | 0 |  |
Consumer loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Amount deferred, CARES Act |  |  | 0 |  |
Commercial and industrial, including specialty lending |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable |  | 6,211,105,000 | 6,672,830,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | 23,503,000 | 17,582,000 | 12,702,000 | 12,239,000
Charge-offs |  | 16,915,000 | 16,248,000 | 1,550,000 |
Commercial and industrial, including specialty lending | Loans Originated Under Small Business Administration (SBA) CARES Act Paycheck Protection Program, Subsequently Determined Ineligible for Forgiveness |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Charge-offs |  |  | 11,000,000 |  |
Commercial real estate non-owner occupied |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable |  | 1,177,650,000 | 1,290,730,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | 16,859,000 | 11,219,000 | 6,210,000 | $ 19,452,000
Charge-offs |  | 4,527,000 | $ 6,075,000 | $ 944,000 |
Debt Forgiveness |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | loan |  |  | 0 | 0 |
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 |  | $ 15,800,000 | $ 11,500,000 |  |

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