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BUSINESS COMBINATION - Preliminary Purchase Price Allocation and Assets Acquired and Liabilities (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 02, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair value of liabilities assumed:          
Bargain purchase gain   $ 90,363,000 $ 0 $ 90,363,000 $ 0
Mechanics Bank Acquisition          
Net assets identified          
Purchase price consideration $ 265,803,348        
Fair value of assets acquired:          
Cash and cash equivalents 156,890,000        
Total investment securities 1,028,627,000        
Loans held for sale 39,489,000        
Loans held for investment 5,625,463,000        
Allowance for credit losses (63,494,000)        
Mortgage servicing rights 89,704,000        
Premises and equipment, net 31,979,000        
Other intangible assets, net 114,207,000        
Deferred tax assets 81,420,000        
Other assets 283,208,000        
Total assets acquired 7,387,493,000        
Fair value of liabilities assumed:          
Deposits 5,743,725,000        
FHLB advances 1,005,370,000        
Long-term debt 193,466,000        
Accrued interest payable and other liabilities 88,766,000        
Total liabilities assumed 7,031,327,000        
Net assets acquired 356,166,000        
Bargain purchase gain $ 90,363,000