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Transfers and Servicing of Financial Assets - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 27, 2024 USD ($) | Feb. 12, 2024 USD ($) loan | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2021 USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on sale of loans |  |  |  |  | $ (11,800) | $ 2,000 | $ 3,900 |  |
Gain (loss) on sale of loans excluding charges |  |  |  |  | $ 7,900 |  |  |  |
Multi-family loans | $ 303,900 |  |  |  |  |  |  |  |
Multi-family loans, carrying amount | 302,500 |  |  |  |  |  |  |  |
Multi-family loans, accrued interest receivable | 1,400 |  |  |  |  |  |  |  |
Exchange for net cash proceeds | $ 311,600 |  |  |  |  |  |  |  |
Reimbursement obligation coverage percentage | 12.00% |  |  |  | 12.00% |  |  |  |
Accrued expenses and other liabilities |  |  |  |  | $ 1,775,318 | 1,603,744 |  |  |
Reimbursement obligation coverage reduction sought |  |  |  |  | 25.00% |  |  |  |
Allowance for credit losses reversed into earnings |  |  |  |  |  |  |  | $ 5,400 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Other income |  |  |  |
Loans and leases, net |  |  |  |  | $ 51,815,602 | 50,090,315 |  |  |
Aggregate UPB |  |  | $ 1,400,000 |  |  |  |  |  |
Cash proceeds from sale of business |  |  |  | $ 4,100 |  |  |  |  |
Carrying value of mortgage servicing rights |  |  |  |  | 1,234 | 8,523 | 9,515 |  | $ 9,237
Payroll Finance Loan Portfolio |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases, net |  |  |  |  | 133,200 |  |  |  |
ACL re-established against payroll finance loans |  |  |  |  | 300 |  |  |  |
Consumer portfolio | Residential Mortgage Loans Servicing Retained |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | 4,400 | 6,500 | 32,100 |  |
Commercial Loan |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of loans not originated for sale |  |  |  |  | 146,500 | 625,100 | 676,400 |  |
Mortgage banking activities |  |  |  |  | 500 | 900 | 3,300 |  |
Residential |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of loans not originated for sale |  |  |  |  | 9,100 | 12,800 | 35,800 |  |
Mortgage banking activities |  |  |  |  | (700) | 1,100 | 600 |  |
Retained servicing rights |  |  |  |  | 400,000 | 1,800,000 |  |  |
Bank servicing fees |  |  |  |  | 1,300 | $ 4,000 | $ 5,900 |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Commercial Services Business |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Aggregate balance of payroll finance and factored receivables loans transferred |  |  |  |  |  |  |  | $ 220,200 |
Discontinued Operations, Disposed of by Sale | Factored Receivables Loan Portfolio |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Aggregate balance of payroll finance and factored receivables loans transferred |  | $ 124,100 |  |  |  |  |  |  |
Proceeds from sale of loan portfolio |  | 129,200 |  |  |  |  |  |  |
Write-off carrying amount |  | 19,700 |  |  |  |  |  |  |
Selling costs |  | 1,300 |  |  |  |  |  |  |
Gain recognized on sale |  | $ 16,000 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mortgage Servicing Portfolio |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Gain recognized on sale |  |  | $ 11,700 |  |  |  |  |  |
Individual residential mortgage loans | loan |  |  | 9,184 |  |  |  |  |  |
Cash proceeds from sale of business |  |  | $ 18,400 |  |  |  |  |  |
Mortgage servicing rights |  |  | $ 6,700 |  |  |  |  |  |
Multifamily Loans |  |  |  |  |  |  |  |  |
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |  |  |  |  |  |  |  |
Exchange for net cash proceeds | $ 4,400 |  |  |  |  |  |  |  |
Accrued expenses and other liabilities | $ 3,300 |  |  |  | $ 3,300 |  |  |  |

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