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Goodwill and Other Intangible Assets - Gross Carrying Value and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2024 | Sep. 30, 2024 | Dec. 31, 2024 | Jan. 24, 2024 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | $ 461,000 |  | $ 301,037
Accumulated Amortization |  |  | 126,699 |  | 97,902
Net Carrying Amount |  |  | 334,301 |  | 203,135
ImpairmentIntangibleAssetStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag |  | true |  |  |
Discontinued Operations, Disposed of by Sale | Factored Receivables Loan Portfolio |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Write-off carrying amount | $ 19,700 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Accumulated Amortization | 7,300 |  |  |  |
Gross carrying amount | 27,000 |  |  |  |
Core Deposits |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 328,837 |  | 146,037
Accumulated Amortization |  |  | 76,795 |  | 53,986
Net Carrying Amount |  |  | 252,042 |  | 92,051
Core Deposits | Ametros |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets |  |  |  | $ 182,800 |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 122,063 |  | 151,000
Accumulated Amortization |  |  | 47,186 |  | 43,116
Net Carrying Amount |  |  | 74,877 |  | 107,884
Noncompete Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 4,000 |  | 4,000
Accumulated Amortization |  |  | 1,600 |  | 800
Net Carrying Amount |  |  | 2,400 |  | 3,200
Trade Names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 6,100 |  | 0
Accumulated Amortization |  |  | 1,118 |  | 0
Net Carrying Amount |  |  | $ 4,982 |  | $ 0
Trade Names | Ametros |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets |  |  |  | $ 6,100 |
Customer-Related Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment loss |  | $ 1,900 |  |  |
Fair value of intangible assets | $ 28,000 |  |  |  |

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