LOANS, Troubled Debt Restructurings (TDRs) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Loan	Mar. 31, 2018 USD ($) Loan	Dec. 31, 2018 USD ($) Loan
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	227		218
TDRs, amount	$ 5,909		$ 5,525
Loans modified in TDR during the year, number | Loan	20	7
Loans modified in TDR during the year, amount	$ 767	$ 136
Maximum [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
Threshold balance of TDR loans collectively included in general loan loss allocation and qualitative review	$ 500
Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	66		62
TDRs, amount	$ 2,534		$ 2,388
Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	161		156
TDRs, amount	$ 3,375		$ 3,137
Commercial Portfolio Segment [Member] | Minimum [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
Threshold balance of loans individually evaluated for impairment	$ 500
Commercial Portfolio Segment [Member] | Business Lending [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	5		6
TDRs, amount	$ 248		$ 327
Loans modified in TDR during the year, number | Loan	0	1
Loans modified in TDR during the year, amount	$ 0	$ 93
Commercial Portfolio Segment [Member] | Business Lending [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	3		4
TDRs, amount	$ 87		$ 162
Commercial Portfolio Segment [Member] | Business Lending [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	2		2
TDRs, amount	$ 161		$ 165
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	100		92
TDRs, amount	$ 4,241		$ 3,755
Loans modified in TDR during the year, number | Loan	8	0
Loans modified in TDR during the year, amount	$ 665	$ 0
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	50		46
TDRs, amount	$ 2,214		$ 1,986
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	50		46
TDRs, amount	$ 2,027		$ 1,769
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	85		77
TDRs, amount	$ 916		$ 857
Loans modified in TDR during the year, number | Loan	11	4
Loans modified in TDR during the year, amount	$ 98	$ 41
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	0		0
TDRs, amount	$ 0		$ 0
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	85		77
TDRs, amount	$ 916		$ 857
Consumer Portfolio Segment [Member] | Consumer Direct [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	15		22
TDRs, amount	$ 1		$ 71
Loans modified in TDR during the year, number | Loan	0	2
Loans modified in TDR during the year, amount	$ 0	$ 2
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	0		0
TDRs, amount	$ 0		$ 0
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	15		22
TDRs, amount	$ 1		$ 71
Consumer Portfolio Segment [Member] | Home Equity [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	22		21
TDRs, amount	$ 503		$ 515
Loans modified in TDR during the year, number | Loan	1	0
Loans modified in TDR during the year, amount	$ 4	$ 0
Consumer Portfolio Segment [Member] | Home Equity [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	13		12
TDRs, amount	$ 233		$ 240
Consumer Portfolio Segment [Member] | Home Equity [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	9		9
TDRs, amount	$ 270		$ 275