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BUSINESS COMBINATIONS (Additional Information) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 07, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Asset Acquisition [Line Items]        
Other assets acquisition $ 197,100      
Total assets   $ 16,484,544   $ 16,476,540
Cash and cash equivalents   618,355   203,461
Premises and equipment   45,518   46,698
Bank owned life insurance (BOLI)   257,348   255,528
Other assets   124,426   108,946
Goodwill   765,822   765,822
Fair value of liabilities assumed   0 $ 80,230  
Noninterest-bearing deposits   7,878,810   8,164,364
Interest-bearing deposits   $ 4,518,711   $ 4,671,881
Suncrest Bank        
Asset Acquisition [Line Items]        
Cash consideration 39,600      
Total assets 1,380,000      
Cash and cash equivalents 329,000      
Fair value of acquired investment securities 131,100      
Acquired net loans at fair value 765,900      
Premises and equipment 6,100      
Bank owned life insurance (BOLI) 9,000      
Other assets 33,700      
Loans recorded at a fair value 224,700      
Loans net of a discount 13,100      
Loans credit discount 8,600      
Deposit premium 3,900      
Goodwill 102,100      
Fair value of liabilities assumed 1,190,000      
Noninterest-bearing deposits 512,800      
Interest-bearing deposits 669,800      
Other liabilities $ 6,200      
Non-recurring merger related expenses     $ 6,000