LOANS, Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Aged analysis of the company's loans [Abstract]
Total Loans		$ 4,801,375	$ 4,236,206
Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		18,805	17,676
Total Past Due		49,612	54,940
Current		4,134,109	3,908,458
Total Loans		4,183,721	3,963,398
Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		29,006	34,436
Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		1,801	2,828
Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		2,923	3,055
Total Past Due		6,246	6,721
Acquired Impaired	[1]	7,299	5,312
Current		604,109	260,775
Total Loans		617,654	272,808
Acquired Loans [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		2,929	3,388
Acquired Loans [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		394	278
Consumer Mortgage [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,581,458	1,544,401
Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		188,296	68,983
Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,497,271	1,262,484
Business Lending [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,233,628	1,124,594
Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		263,643	137,890
Consumer Indirect [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		890,339	832,745
Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		45,421	1,223
Consumer Direct [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		178,051	178,585
Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		17,025	5,443
Home Equity [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		300,245	283,073
Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		103,269	59,269
Residential Portfolio Segment [Member] | Consumer Mortgage [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,769,754	1,613,384
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		11,394	13,201
Total Past Due		23,287	29,344
Current		1,558,171	1,515,057
Total Loans		1,581,458	1,544,401
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		10,482	13,978
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		1,411	2,165
Residential Portfolio Segment [Member] | Consumer Mortgage [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,396	2,122
Total Past Due		3,163	4,246
Acquired Impaired	[1]	0	0
Current		185,133	64,737
Total Loans		188,296	68,983
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		1,373	1,892
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		394	232
Commercial Portfolio Segment [Member] | Business Lending [Member]
Aged analysis of the company's loans [Abstract]
Total Loans		1,497,271	1,262,484
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		5,381	2,291
Total Past Due		9,949	9,379
Current		1,223,679	1,115,215
Total Loans		1,233,628	1,124,594
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		4,442	6,738
Commercial Portfolio Segment [Member] | Business Lending [Member] | Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		126	350
Commercial Portfolio Segment [Member] | Business Lending [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1,186	489
Total Past Due		1,721	1,097
Acquired Impaired	[1]	7,299	5,312
Current		254,623	131,481
Total Loans		263,643	137,890
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		535	608
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		935,760	833,968
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	10
Total Past Due		11,677	10,621
Current		878,662	822,124
Total Loans		890,339	832,745
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		11,575	10,529
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		102	82
Consumer Portfolio Segment [Member] | Consumer Indirect [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		0	0
Total Past Due		245	40
Acquired Impaired	[1]	0	0
Current		45,176	1,183
Total Loans		45,421	1,223
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		245	40
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		195,076	184,028
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		1	2
Total Past Due		1,466	1,427
Current		176,585	177,158
Total Loans		178,051	178,585
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		1,414	1,389
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		51	36
Consumer Portfolio Segment [Member] | Consumer Direct [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		14	18
Total Past Due		154	192
Acquired Impaired	[1]	0	0
Current		16,871	5,251
Total Loans		17,025	5,443
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		140	174
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		403,514	342,342
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loan [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		2,029	2,172
Total Past Due		3,233	4,169
Current		297,012	278,904
Total Loans		300,245	283,073
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loan [Member] | Past Due 30 - 89 Days [Member]
Aged analysis of the company's loans [Abstract]
Total Past Due		1,093	1,802
Consumer Portfolio Segment [Member] | Home Equity [Member] | Legacy Loan [Member] | 90+ Days Past Due [Member]
Aged analysis of the company's loans [Abstract]
90 + Days Past Due and Still Accruing		111	195
Consumer Portfolio Segment [Member] | Home Equity [Member] | Acquired Loans [Member]
Aged analysis of the company's loans [Abstract]
Nonaccrual		327	426
Total Past Due		963	1,146
Acquired Impaired	[1]	0	0
Current		102,306	58,123
Total Loans		103,269	59,269
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		636	674
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		$ 0	$ 46

[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.