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MANDATORILY REDEEMABLE PREFERRED SECURITIES (Details)
$ in Millions
6 Months Ended
Sep. 16, 2019
USD ($)
Jun. 30, 2020
USD ($)
Trust
Mandatorily Redeemable Preferred Securities [Abstract]    
Number of unconsolidated subsidiary business trusts owned | Trust   2
Business Trust [Member]    
Mandatorily Redeemable Preferred Securities [Abstract]    
Percent ownership of unconsolidated subsidiary trusts   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  
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
Effective interest rate   1.96%
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] | Steuben Statutory Trust II [Member]    
Terms of preferred securities for each trust [Abstract]    
Issuance date   Jul. 16, 2007
Par amount   $ 2.0
Effective interest rate   1.86%
Maturity date   Sep. 15, 2037
Call price   Par
Preferred Debt [Member] | Steuben Statutory Trust II [Member] | LIBOR [Member]    
Terms of preferred securities for each trust [Abstract]    
Term of variable rate   3 months
Variable interest rate, basis spread   1.55%