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BORROWINGS, Preferred Securities (Details)
$ in Millions
12 Months Ended
Sep. 16, 2019
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Trust
Mandatorily Redeemable Preferred Securities [Abstract]      
Number of unconsolidated subsidiary business trust owned | Trust     1
Business Trusts [Member]      
Mandatorily Redeemable Preferred Securities [Abstract]      
Percent ownership of unconsolidated subsidiary trust     100.00%
MBVT Statutory Trust I [Member]      
Mandatorily Redeemable Preferred Securities [Abstract]      
Redemption of debentures and associated preferred securities $ 20.6    
Kinderhook Capital Trust [Member]      
Mandatorily Redeemable Preferred Securities [Abstract]      
Redemption of debentures and associated preferred securities $ 2.1    
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     3.54%
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%