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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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All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Gain (Loss) On Sale Of Loans And Leases, Excluding Charges

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