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ACQUISITIONS (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2021
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Total assets   $ 3,948,226 $ 3,948,226 $ 3,666,567
Loans, net of allowance for loan losses   2,122,951 2,122,951 2,215,168
Total deposits   3,419,556 3,419,556 $ 3,130,534
NXT Bancorporation, Inc        
Business Acquisition [Line Items]        
Total assets   232,000 232,000  
Loans, net of allowance for loan losses   196,000 196,000  
Total deposits   181,000 181,000  
NXT Bancorporation, Inc        
Business Acquisition [Line Items]        
Stock consideration per share 67.6783      
Purchase Price Per Share $ 400      
Cash consideration $ 10,600      
Stock consideration (number of shares) 1,800,000      
pre-tax acquisition expenses   $ 380 $ 537