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Business Developments - Narrative (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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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 |  |  |  |  |

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