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BORROWINGS, Preferred Securities (Details)
$ in Millions
12 Months Ended
Jul. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Trust
Mandatorily Redeemable Preferred Securities [Abstract]    
Number of unconsolidated subsidiary business trusts owned | Trust   2
Business Trusts [Member]    
Mandatorily Redeemable Preferred Securities [Abstract]    
Number of unconsolidated subsidiary business trusts owned | Trust   2
Percent ownership of unconsolidated subsidiary trusts   100.00%
Community Statutory Trust III [Member]    
Mandatorily Redeemable Preferred Securities [Abstract]    
Redemption of debentures and associated preferred securities $ 25.2  
Preferred Debt [Member] | Community Capital Trust IV [Member]    
Terms of preferred securities for each trust [Abstract]    
Issuance date   Dec. 08, 2006
Par amount   $ 75.0
Variable interest rate basis   3 month LIBOR
Effective interest rate   4.44%
Maturity date   Dec. 15, 2036
Call price   Par
Preferred Debt [Member] | Community Capital Trust IV [Member] | LIBOR [Member]    
Terms of preferred securities for each trust [Abstract]    
Term of variable rate   3 months
Variable interest rate, basis spread   1.65%
Preferred Debt [Member] | MBVT Statutory Trust I [Member]    
Terms of preferred securities for each trust [Abstract]    
Issuance date   Dec. 15, 2004
Par amount   $ 20.6
Variable interest rate basis   3 month LIBOR
Effective interest rate   4.74%
Maturity date   Dec. 15, 2034
Call price   Par
Preferred Debt [Member] | MBVT Statutory Trust I [Member] | LIBOR [Member]    
Terms of preferred securities for each trust [Abstract]    
Term of variable rate   3 months
Variable interest rate, basis spread   1.95%