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INVESTMENT SECURITIES - Narrative (Details)
$ in Millions
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in security portfolio 547  
Number of securities in unrealized loss position 24  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 9  
State, county and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 1  
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 4  
SBA pool securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 10  
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Pledged securities, carrying value | $ $ 658.5 $ 679.6