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BUSINESS COMBINATIONS - Carrying Amount of Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2022
Mar. 31, 2022
Business Acquisition [Line Items]    
Allowance for credit losses at acquisition   $ (26,103)
Bryn Mawr Bank Corporation Acquisition    
Business Acquisition [Line Items]    
Book balance of loans at acquisition $ 235,791  
Allowance for credit losses at acquisition (26,103) $ (26,100)
Non-credit related discount (1,421)  
Total purchase credit deteriorated (PCD) loans acquired $ 208,267