LOANS, Carrying Amounts of Loans Purchased and Sold (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	$ 339,692
Sales	15,599
Commercial Portfolio Segment [Member] | Business Lending [Member]
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	253,469
Sales	0
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	26,733
Sales	15,599
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	13,926
Sales	0
Consumer Portfolio Segment [Member] | Consumer Direct [Member]
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	6,022
Sales	0
Consumer Portfolio Segment [Member] | Home Equity [Member]
Carrying Amounts of Loans Purchased and Sold [Abstract]
Purchases	39,542
Sales	$ 0