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BUSINESS COMBINATION - Preliminary Purchase Price Allocation and Assets Acquired and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 02, 2025
Mar. 31, 2026
Fair value of liabilities assumed:    
Bargain purchase gain   $ 0
Mechanics Bank Acquisition    
Net assets identified    
Purchase price consideration $ 265,803  
Fair value of assets acquired:    
Cash and cash equivalents 156,890  
Total investment securities 1,028,627  
Loans held for sale 39,489  
Loans held for investment 5,645,715  
Allowance for credit losses (83,746)  
Mortgage servicing rights 89,533  
Premises and equipment 31,979  
Other intangible assets, net 190,913  
Deferred tax assets 59,960  
Other assets 283,526  
Total assets acquired 7,442,886  
Fair value of liabilities assumed:    
Deposits 5,743,725  
FHLB advances 1,005,370  
Long-term debt 193,466  
Accrued interest payable and other liabilities 89,062  
Total liabilities assumed 7,031,623  
Net assets acquired 411,263  
Bargain purchase gain 145,460  
Mechanics Bank Acquisition | Core deposit intangibles    
Fair value of liabilities assumed:    
Intangible assets acquired in merger, core deposits 90,800  
Mechanics Bank Acquisition | DUS License    
Fair value of liabilities assumed:    
Intangible assets acquired $ 100,200