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INVESTMENT SECURITIES - Narrative (Details)
$ in Millions
Mar. 31, 2018
USD ($)
security
position
Dec. 31, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Pledged securities, carrying value | $ $ 368.3 $ 403.3
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in security portfolio | security 390  
Number of securities in unrealized loss position 277  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in unrealized loss position 226  
State, county and municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in unrealized loss position 41  
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of securities in unrealized loss position 10