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LOANS AND ALLOWANCE FOR LOAN LOSSES - Carrying Amount of PCI Loans (Details) - Purchased credit impaired loans
$ in Thousands
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]  
Outstanding balance $ 39,439
Carrying amount, net of allowance 39,355
Commercial  
Financing Receivable, Impaired [Line Items]  
Outstanding balance 21,008
Residential  
Financing Receivable, Impaired [Line Items]  
Outstanding balance 16,943
Consumer  
Financing Receivable, Impaired [Line Items]  
Outstanding balance $ 1,488