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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Allowance for Credit Losses $ (101) $ (112) $ 0 $ 0
Gross Unrealized Losses $ (362) (443)    
Debt Securities        
Debt Securities, Available-for-sale [Line Items]        
Number of securities in security portfolio | security 488      
Number of securities in unrealized loss position | security 33      
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises        
Debt Securities, Available-for-sale [Line Items]        
Number of securities in unrealized loss position | security 21      
SBA pool securities        
Debt Securities, Available-for-sale [Line Items]        
Number of securities in unrealized loss position | security 9      
Allowance for Credit Losses $ 0 0    
Gross Unrealized Losses $ (102) (96)    
Corporate debt securities        
Debt Securities, Available-for-sale [Line Items]        
Number of securities in unrealized loss position | security 3      
Allowance for Credit Losses $ (101) (112)    
Gross Unrealized Losses (229) (233)    
Collateral Pledged        
Debt Securities, Available-for-sale [Line Items]        
Pledged securities, carrying value $ 372,800 $ 438,700