Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Business Developments - Narrative (Details) $ in Thousands										1 Months Ended	3 Months Ended	12 Months Ended
Business Developments - Narrative (Details) $ in Thousands	Dec. 04, 2025 USD ($)	Dec. 03, 2025 USD ($)	Nov. 14, 2025 USD ($)	Oct. 01, 2025 USD ($)	Aug. 29, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 27, 2024 USD ($)	Feb. 12, 2024 USD ($) loan	Jan. 24, 2024 USD ($)	Nov. 30, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Business Combination [Line Items]
Goodwill												$ 2,897,522	$ 2,868,068	$ 2,631,465
Professional and outside services												75,202	58,253	107,497
Provision for credit losses												$ 210,000	222,000	$ 150,747
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												$ 1,504,704	1,775,318
Reimbursement obligation coverage reduction sought												25.00%
Allowance for credit losses reversed into earnings											$ 5,400
Loans and leases, net												$ 55,877,699	51,815,602
Aggregate UPB								$ 1,400,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Commercial Services Business
Business Combination [Line Items]
Aggregate balance of payroll finance and factored receivables loans transferred											220,200
Discontinued Operations, Disposed of by Sale \| Factored Receivables Loan Portfolio
Business Combination [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			$ 700
Selling costs							1,300
Gain recognized on sale							$ 16,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]							Other income
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Mortgage Servicing Portfolio
Business Combination [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
Business Combination [Line Items]
Exchange for net cash proceeds						$ 4,400
Accrued expenses and other liabilities						$ 3,300						3,300
Commercial portfolio \| Funds held in escrow
Business Combination [Line Items]
Amount derecognized												247,500
Other non-interest income												2,100
Provision for credit losses												1,300
Payroll Finance Loan Portfolio
Business Combination [Line Items]
Loans and leases, net													133,200
ACL re-established against payroll finance loans													$ 300
United Community Bank HSA Portfolio Acquisition
Business Combination [Line Items]
Consideration received			$ 10,500
Deposit premium percentage			8.00%
Elements Financial Federal Credit Union HSA Portfolio Acquisition
Business Combination [Line Items]
Consideration received				$ 53,900
Deposit premium percentage				12.00%
Total deposits settlement				$ 40,900
Allegacy Federal Credit Union HSA Portfolio Acquisition
Business Combination [Line Items]
Consideration received					$ 6,200
Deposit premium percentage					12.00%
Core Deposits \| United Community Bank HSA Portfolio Acquisition
Business Combination [Line Items]
Acquired intangible assets, useful life			9 years
Intangible assets acquired			$ 800
Amortization rate			1.50%
Core Deposits \| Elements Financial Federal Credit Union HSA Portfolio Acquisition
Business Combination [Line Items]
Acquired intangible assets, useful life				9 years
Intangible assets acquired				$ 4,900
Amortization rate				1.50%
Core Deposits \| Allegacy Federal Credit Union HSA Portfolio Acquisition
Business Combination [Line Items]
Acquired intangible assets, useful life					9 years
Intangible assets acquired					$ 700
Amortization rate					1.50%
SecureSave
Business Combination [Line Items]
Equity interest		17.00%
Acquisition date fair value of		$ 8,000
Purchase price	$ 34,900
Equity interests acquired	83.00%
Cash consideration	$ 26,500
Contingent consideration	8,400
Cash portion of contingent consideration payable	35,000
Purchase price allocation	13,500
Goodwill	29,500											$ 29,500
SecureSave \| Core Deposits
Business Combination [Line Items]
Intangible assets	$ 7,600
Acquired intangible assets, useful life	10 years
SecureSave \| Noncompete Agreements
Business Combination [Line Items]
Intangible assets	$ 1,900
Acquired intangible assets, useful life	3 years
Ametros
Business Combination [Line Items]
Equity interest									0.60%
Equity interests acquired									99.40%
Cash consideration									$ 359,700
Purchase price allocation									446,167
Goodwill									$ 228,185
Professional and outside services											$ 3,100
Ametros \| Core Deposits
Business Combination [Line Items]
Acquired intangible assets, useful life									25 years
Intangible assets									$ 182,800
Ametros \| Trade Names
Business Combination [Line Items]
Acquired intangible assets, useful life									5 years
Intangible assets									$ 6,100