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ACQUISITIONS (Acquisitions Fair Values) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 04, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair value of liabilities assumed      
Goodwill resulting from acquisition   $ 576,005 $ 446,345
AIM Bancshares, Inc.      
Fair value of consideration paid:      
Common stock (in shares) 5,185,045    
Common stock (5,185,045 shares) $ 217,202    
Cash 47,275 $ 47,300  
Total consideration paid 264,477    
Fair value of assets acquired      
Cash and cash equivalents 470,085    
Securities:      
Carried at fair value 267,936    
Other securities 3,210    
Loans held to maturity 1,087,041    
Allowance for credit losses for loans (12,055)    
Net loans held to maturity 1,074,986    
Premises, furniture and equipment, net 27,867    
Other real estate, net 1,119    
Core deposit intangibles and customer relationships, net 3,102    
Cash surrender value on life insurance 13,418    
Other assets 20,159    
Total assets 1,881,882    
Fair value of liabilities assumed      
Deposits 1,670,715    
Short term borrowings 26,306    
Other liabilities 11,807    
Total liabilities assumed 1,708,828    
Fair value of net assets acquired 173,054    
Goodwill resulting from acquisition $ 91,423