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INVESTMENT SECURITIES - Narrative (Details)
$ in Millions
Dec. 31, 2018
USD ($)
position
security
Dec. 31, 2017
USD ($)
Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in security portfolio 531  
Number of securities in unrealized loss position 293  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 239  
State, county and municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position | position 41  
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities in unrealized loss position 13  
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Pledged Securities, carrying value | $ $ 510.0 $ 403.3