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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