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INVESTMENT SECURITIES - Narrative (Details)
$ in Millions
Sep. 30, 2018
USD ($)
position
security
Dec. 31, 2017
USD ($)
Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in security portfolio | security 527  
Number of securities in unrealized loss position 386  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 303  
State, county and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 68  
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 15  
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Pledged securities, carrying value | $ $ 363.1 $ 403.3