LOANS, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 45,401	$ 45,341
Charge-offs	(12,183)	(12,071)
Recoveries	5,939	5,684
Provision	8,076	6,447	$ 7,178
Balance, end of period	47,233	45,401	45,341
Acquired Impaired [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	168	173
Charge-offs	(97)	(103)
Recoveries	0	0
Provision	37	98
Balance, end of period	108	168	173
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	10,198	10,286
Charge-offs	(647)	(1,374)
Recoveries	115	80
Provision	428	1,206
Balance, end of period	10,094	10,198	10,286
Commercial Portfolio Segment [Member] | Business Lending [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	15,749	15,787
Charge-offs	(1,872)	(2,146)
Recoveries	616	877
Provision	2,727	1,231
Balance, end of period	17,220	15,749	15,787
Consumer Portfolio Segment [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	2,666	2,701
Charge-offs	(218)	(244)
Recoveries	139	62
Provision	(188)	147
Balance, end of period	2,399	2,666	2,701
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	2,997	3,083
Charge-offs	(1,706)	(1,490)
Recoveries	901	722
Provision	787	682
Balance, end of period	2,979	2,997	3,083
Consumer Portfolio Segment [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	12,422	11,544
Charge-offs	(7,643)	(6,714)
Recoveries	4,168	3,943
Provision	4,835	3,649
Balance, end of period	13,782	12,422	11,544
Unallocated Financing Receivables [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	1,201	1,767
Charge-offs	0	0
Recoveries	0	0
Provision	(550)	(566)
Balance, end of period	$ 651	$ 1,201	$ 1,767