LOANS, Troubled Debt Restructurings (TDRs) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2018 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Dec. 31, 2017 USD ($) Loan
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	214		214		226
TDRs, amount	$ 5,888		$ 5,888		$ 6,135
Loans modified in TDR during the year, number | Loan	16	13	22	31
Loans modified in TDR during the year, amount	$ 620	$ 486	$ 737	$ 1,176
Maximum [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
Threshold balance of TDR loans collectively included in general loan loss allocation and qualitative review	$ 500		$ 500
Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	63		63		72
TDRs, amount	$ 2,700		$ 2,700		$ 2,728
Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	151		151		154
TDRs, amount	$ 3,188		$ 3,188		$ 3,407
Commercial Portfolio Segment [Member] | Minimum [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
Threshold balance of loans individually evaluated for impairment	$ 500		$ 500
Commercial Portfolio Segment [Member] | Business Lending [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	9		9		15
TDRs, amount	$ 556		$ 556		$ 719
Loans modified in TDR during the year, number | Loan	0	3	1	3
Loans modified in TDR during the year, amount	$ 0	$ 363	$ 93	$ 363
Commercial Portfolio Segment [Member] | Business Lending [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	5		5		8
TDRs, amount	$ 210		$ 210		$ 218
Commercial Portfolio Segment [Member] | Business Lending [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	4		4		7
TDRs, amount	$ 346		$ 346		$ 501
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	90		90		95
TDRs, amount	$ 3,953		$ 3,953		$ 4,015
Loans modified in TDR during the year, number | Loan	4	1	4	8
Loans modified in TDR during the year, amount	$ 452	$ 43	$ 452	$ 545
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	47		47		51
TDRs, amount	$ 2,264		$ 2,264		$ 2,265
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	43		43		44
TDRs, amount	$ 1,689		$ 1,689		$ 1,750
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	70		70		71
TDRs, amount	$ 796		$ 796		$ 883
Loans modified in TDR during the year, number | Loan	8	8	11	14
Loans modified in TDR during the year, amount	$ 70	$ 80	$ 92	$ 156
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	0		0		0
TDRs, amount	$ 0		$ 0		$ 0
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	70		70		71
TDRs, amount	$ 796		$ 796		$ 883
Consumer Portfolio Segment [Member] | Consumer Direct [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	26		26		25
TDRs, amount	$ 73		$ 73		$ 69
Loans modified in TDR during the year, number | Loan	3	1	5	4
Loans modified in TDR during the year, amount	$ 12	$ 0	$ 14	$ 14
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	0		0		0
TDRs, amount	$ 0		$ 0		$ 0
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	26		26		25
TDRs, amount	$ 73		$ 73		$ 69
Consumer Portfolio Segment [Member] | Home Equity [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	19		19		20
TDRs, amount	$ 510		$ 510		$ 449
Loans modified in TDR during the year, number | Loan	1	0	1	2
Loans modified in TDR during the year, amount	$ 86	$ 0	$ 86	$ 98
Consumer Portfolio Segment [Member] | Home Equity [Member] | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	11		11		13
TDRs, amount	$ 226		$ 226		$ 245
Consumer Portfolio Segment [Member] | Home Equity [Member] | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | Loan	8		8		7
TDRs, amount	$ 284		$ 284		$ 204