LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Aged analysis of the company's loans [Abstract]
Total Loans		$ 4,821,172	$ 4,801,375
Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		20,045	18,805
Total Past Due		42,269	49,612
Current		4,188,034	4,134,109
Total Loans		4,230,303	4,183,721
Legacy Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		20,387	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		1,837	1,801
Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		3,720	2,923
Total Past Due		6,110	6,246
Current		577,585	604,109
Acquired Impaired	[1]	7,174	7,299
Total Loans		590,869	617,654
Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		1,900	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		490	394
Consumer Mortgage [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,596,191	1,581,458
Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		181,601	188,296
Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,509,421	1,497,271
Business Lending [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,254,998	1,233,628
Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		254,423	263,643
Consumer Indirect [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		900,136	890,339
Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		41,015	45,421
Consumer Direct [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		174,780	178,051
Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		14,755	17,025
Home Equity [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		304,198	300,245
Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		99,075	103,269
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,777,792	1,769,754
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		11,642	11,394
Total Past Due		21,308	23,287
Current		1,574,883	1,558,171
Total Loans		1,596,191	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		8,452	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		1,214	1,411
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,884	1,396
Total Past Due		3,324	3,163
Current		178,277	185,133
Acquired Impaired	[1]	0	0
Total Loans		181,601	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		1,098	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		342	394
Commercial Portfolio Segment [Member] | Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,509,421	1,497,271
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		6,417	5,381
Total Past Due		9,023	9,949
Current		1,245,975	1,223,679
Total Loans		1,254,998	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		2,560	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		46	126
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,420	1,186
Total Past Due		1,549	1,721
Current		245,700	254,623
Acquired Impaired	[1]	7,174	7,299
Total Loans		254,423	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		129	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		941,151	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		7,976	11,677
Current		892,160	878,662
Total Loans		900,136	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		7,793	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		183	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		126	245
Current		40,889	45,176
Acquired Impaired	[1]	0	0
Total Loans		41,015	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		126	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		189,535	195,076
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1	1
Total Past Due		912	1,466
Current		173,868	176,585
Total Loans		174,780	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		858	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		53	51
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		13	14
Total Past Due		141	154
Current		14,614	16,871
Acquired Impaired	[1]	0	0
Total Loans		14,755	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		122	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		6	0
Consumer Portfolio Segment [Member] | Home Equity [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		403,273	403,514
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,985	2,029
Total Past Due		3,050	3,233
Current		301,148	297,012
Total Loans		304,198	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		724	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		341	111
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		403	327
Total Past Due		970	963
Current		98,105	102,306
Acquired Impaired	[1]	0	0
Total Loans		99,075	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		425	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		$ 142	$ 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.