LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Aged analysis of the company's loans [Abstract]
Total loans		$ 4,904,802	$ 4,801,375
Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		18,259	18,805
Total past due		46,699	49,612
Current		4,293,361	4,134,109
Total loans		4,340,060	4,183,721
Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		26,867	29,006
Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		1,573	1,801
Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		3,891	2,923
Total past due		7,068	6,246
Acquired impaired	[1]	7,008	7,299
Current		550,666	604,109
Total loans		564,742	617,654
Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		2,841	2,929
Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		336	394
Consumer Mortgage [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		1,603,559	1,581,458
Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		175,736	188,296
Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total loans		1,536,546	1,497,271
Business Lending [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		1,290,576	1,233,628
Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		245,970	263,643
Consumer Indirect [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		956,144	890,339
Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		36,988	45,421
Consumer Direct [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		183,332	178,051
Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		12,627	17,025
Home Equity [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		306,449	300,245
Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total loans		93,421	103,269
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Aged analysis of the company's loans [Abstract]
Total loans		1,779,295	1,769,754
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		11,621	11,394
Total past due		22,496	23,287
Current		1,581,063	1,558,171
Total loans		1,603,559	1,581,458
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		9,857	10,482
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		1,018	1,411
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		2,223	1,396
Total past due		4,058	3,163
Acquired impaired	[1]	0	0
Current		171,678	185,133
Total loans		175,736	188,296
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		1,565	1,373
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		270	394
Commercial Portfolio Segment [Member] | Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total loans		1,536,546	1,497,271
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		4,714	5,381
Total past due		10,716	9,949
Current		1,279,860	1,223,679
Total loans		1,290,576	1,233,628
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		5,660	4,442
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		342	126
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,260	1,186
Total past due		1,600	1,721
Acquired impaired	[1]	7,008	7,299
Current		237,362	254,623
Total loans		245,970	263,643
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		340	535
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		0	0
Consumer Portfolio Segment [Member] | Consumer Indirect [Member]
Aged analysis of the company's loans [Abstract]
Total loans		993,132	935,760
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	0
Total past due		9,498	11,677
Current		946,646	878,662
Total loans		956,144	890,339
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		9,356	11,575
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		142	102
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	0
Total past due		168	245
Acquired impaired	[1]	0	0
Current		36,820	45,176
Total loans		36,988	45,421
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		168	245
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		0	0
Consumer Portfolio Segment [Member] | Consumer Direct [Member]
Aged analysis of the company's loans [Abstract]
Total loans		195,959	195,076
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	1
Total past due		1,205	1,466
Current		182,127	176,585
Total loans		183,332	178,051
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		1,179	1,414
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		26	51
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	14
Total past due		84	154
Acquired impaired	[1]	0	0
Current		12,543	16,871
Total loans		12,627	17,025
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		84	140
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		0	0
Consumer Portfolio Segment [Member] | Home Equity [Member]
Aged analysis of the company's loans [Abstract]
Total loans		399,870	403,514
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,924	2,029
Total past due		2,784	3,233
Current		303,665	297,012
Total loans		306,449	300,245
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		815	1,093
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		45	111
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		408	327
Total past due		1,158	963
Acquired impaired	[1]	0	0
Current		92,263	102,306
Total loans		93,421	103,269
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total past due		684	636
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + days past due and still accruing		$ 66	$ 0

[1] Acquired impaired loans were not classified as nonperforming assets as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cashflows, is being recognized on all acquired impaired loans.