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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
security
Sep. 30, 2021
branch
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]                
Allowance for credit losses $ 0     $ (81) $ (112) $ (68) $ 0 $ 0
Unrealized losses (192)       (443)      
Expected credit losses 0              
Debt securities, held-to-maturity, allowance for credit loss 0       0      
Debt Securities | Available-for-sale Debt Securities                
Debt Securities, Available-for-sale [Line Items]                
Number of securities in security portfolio | security   450            
Number of securities in unrealized loss position | security   13            
Debt Securities | Held-to-maturity Securities                
Debt Securities, Available-for-sale [Line Items]                
Number of securities in security portfolio | security   11            
Number of securities in unrealized loss position | security   11            
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Available-for-sale Debt Securities                
Debt Securities, Available-for-sale [Line Items]                
Number of securities in unrealized loss position   6 9          
SBA pool securities                
Debt Securities, Available-for-sale [Line Items]                
Allowance for credit losses 0       0      
Unrealized losses (66)       (96)      
SBA pool securities | Available-for-sale Debt Securities                
Debt Securities, Available-for-sale [Line Items]                
Number of securities in unrealized loss position | security   5            
Corporate debt securities                
Debt Securities, Available-for-sale [Line Items]                
Allowance for credit losses 0       (112)      
Unrealized losses (121)       (233)      
Corporate debt securities | Available-for-sale Debt Securities                
Debt Securities, Available-for-sale [Line Items]                
Number of securities in unrealized loss position | security   2            
Collateral Pledged                
Debt Securities, Available-for-sale [Line Items]                
Pledged securities, carrying value $ 354,200       $ 438,700