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ACQUISITIONS - Carrying Value of PCD Loans Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Aug. 26, 2022
Dec. 03, 2021
Sep. 03, 2021
Charter Bankshares, Inc.        
Business Acquisition [Line Items]        
Allowance for credit losses on PCD loans at acquisition $ 2,000 $ 9,000    
Par value of PCD acquired loans at acquisition 827,000 848,000    
Charter Bankshares, Inc. | PCD loans aquired        
Business Acquisition [Line Items]        
Purchase price of PCD loans at acquisition   24,031    
Allowance for credit losses on PCD loans at acquisition   1,709    
Par value of PCD acquired loans at acquisition   $ 25,740    
County Bancorp, Inc.        
Business Acquisition [Line Items]        
Allowance for credit losses on PCD loans at acquisition 3,000   $ 11,000  
Par value of PCD acquired loans at acquisition 1,014,000   1,015,000  
County Bancorp, Inc. | PCD loans aquired        
Business Acquisition [Line Items]        
Purchase price of PCD loans at acquisition     64,720  
Allowance for credit losses on PCD loans at acquisition     3,490  
Par value of PCD acquired loans at acquisition     $ 68,210  
Mackinac Financial Corporation        
Business Acquisition [Line Items]        
Allowance for credit losses on PCD loans at acquisition 2,000     $ 6,000
Par value of PCD acquired loans at acquisition $ 940,000     930,000
Mackinac Financial Corporation | PCD loans aquired        
Business Acquisition [Line Items]        
Purchase price of PCD loans at acquisition       10,605
Allowance for credit losses on PCD loans at acquisition       1,896
Par value of PCD acquired loans at acquisition       $ 12,501