LOAN LOSS ALLOWANCE (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Credit quality information
Loans	4,728,663,000	$ 4,680,600,000
Business Activity
Credit quality information
Loans	4,013,669,000	3,918,880,000
Acquired Loans
Credit quality information
Number of grades in internal loan rating system	11
Allowance for losses on acquired loans under Subtopic ASC 310-30	4,000,000
Loans	714,994,000	761,720,000
Residential | Mortgages
Credit quality information
Number of grades in internal loan rating system	3
Loans	1,473,239,000	1,496,204,000
Residential | Mortgages | Business Activity
Credit quality information
Loans	1,215,814,000	1,226,452,000
Residential | Mortgages | Acquired Loans
Credit quality information
Loans	257,425,000	269,752,000
Residential | Mortgages | 1-4 family
Credit quality information
Loans	1,444,521,000	1,468,142,000
Residential | Mortgages | 1-4 family | Business Activity
Credit quality information
Loans	1,188,018,000	1,199,408,000
Residential | Mortgages | 1-4 family | Acquired Loans
Credit quality information
Loans	256,503,000	268,734,000
Residential | Mortgages | Construction
Credit quality information
Loans	28,718,000	28,062,000
Residential | Mortgages | Construction | Business Activity
Credit quality information
Loans	27,796,000	27,044,000
Residential | Mortgages | Construction | Acquired Loans
Credit quality information
Loans	922,000	1,018,000
Commercial real estate
Credit quality information
Loans	1,672,099,000	1,611,567,000
Commercial real estate | Business Activity
Credit quality information
Loans	1,411,990,000	1,340,076,000
Commercial real estate | Acquired Loans
Credit quality information
Loans	260,109,000	271,491,000
Commercial real estate | Other commercial and industrial loans
Credit quality information
Loans	1,294,527,000	1,244,959,000
Commercial real estate | Other commercial and industrial loans | Business Activity
Credit quality information
Loans	1,086,893,000	1,030,837,000
Commercial real estate | Other commercial and industrial loans | Acquired Loans
Credit quality information
Loans	207,634,000	214,122,000
Commercial real estate | Construction
Credit quality information
Loans	186,846,000	173,390,000
Commercial real estate | Construction | Business Activity
Credit quality information
Loans	182,800,000	169,189,000
Commercial real estate | Construction | Acquired Loans
Credit quality information
Loans	4,046,000	4,201,000
Commercial real estate | Single and multi-family
Credit quality information
Loans	190,726,000	193,218,000
Commercial real estate | Single and multi-family | Business Activity
Credit quality information
Loans	142,297,000	140,050,000
Commercial real estate | Single and multi-family | Acquired Loans
Credit quality information
Loans	48,429,000	53,168,000
Commercial real estate | Other commercial real estate | Business Activity
Credit quality information
Loans	1,086,893,000	1,030,837,000
Commercial real estate | Other commercial real estate | Acquired Loans
Credit quality information
Loans	207,634,000	214,122,000
Commercial real estate | Business loans
Credit quality information
Loans	826,815,000	804,366,000
Commercial real estate | Business loans | Business Activity
Credit quality information
Loans	778,671,000	753,191,000
Commercial real estate | Business loans | Acquired Loans
Credit quality information
Loans	48,144,000	51,175,000
Commercial real estate | Business loans | Asset based lending
Credit quality information
Loans	354,106,000	341,246,000
Commercial real estate | Business loans | Asset based lending | Business Activity
Credit quality information
Loans	354,106,000	341,246,000
Commercial real estate | Business loans | Other commercial and industrial loans
Credit quality information
Loans	472,709,000	463,120,000
Commercial real estate | Business loans | Other commercial and industrial loans | Business Activity
Credit quality information
Loans	424,565,000	411,945,000
Commercial real estate | Business loans | Other commercial and industrial loans | Acquired Loans
Credit quality information
Loans	48,144,000	51,175,000
Consumer
Credit quality information
Loans	756,510,000	768,463,000
Consumer | Business Activity
Credit quality information
Loans	607,194,000	599,161,000
Consumer | Acquired Loans
Credit quality information
Loans	149,316,000	169,302,000
Consumer | Home equity
Credit quality information
Loans	317,615,000	318,632,000
Consumer | Home equity | Business Activity
Credit quality information
Loans	255,368,000	252,681,000
Consumer | Home equity | Acquired Loans
Credit quality information
Loans	62,247,000	65,951,000
Consumer | Auto and other
Credit quality information
Loans	438,895,000	449,831,000
Consumer | Auto and other | Business Activity
Credit quality information
Loans	351,826,000	346,480,000
Consumer | Auto and other | Acquired Loans
Credit quality information
Loans	87,069,000	103,351,000
Consumer | Other
Credit quality information
Number of grades in internal loan rating system	2
Commercial
Credit quality information
Loans	2,498,914,000	2,415,933,000
Commercial | Business Activity
Credit quality information
Loans	2,190,661,000	2,093,267,000
Commercial | Acquired Loans
Credit quality information
Loans	308,253,000	322,666,000
Pass | Residential | Mortgages | Maximum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	59 days
Pass | Residential | Mortgages | Business Activity
Credit quality information
Loans	1,210,446,000	1,221,843,000
Pass | Residential | Mortgages | Acquired Loans
Credit quality information
Loans	254,788,000	267,463,000
Pass | Residential | Mortgages | Acquired Loans | Maximum
Credit quality information
Period within which loans are current, based on which risk rating is assigned	59 days
Pass | Residential | Mortgages | 1-4 family | Business Activity
Credit quality information
Loans	1,183,064,000	1,195,209,000
Pass | Residential | Mortgages | 1-4 family | Acquired Loans
Credit quality information
Loans	253,866,000	266,445,000
Pass | Residential | Mortgages | Construction | Business Activity
Credit quality information
Loans	27,382,000	26,634,000
Pass | Residential | Mortgages | Construction | Acquired Loans
Credit quality information
Loans	922,000	1,018,000
Pass | Commercial real estate | Business Activity
Credit quality information
Loans	1,343,194,000	1,263,664,000
Pass | Commercial real estate | Acquired Loans
Credit quality information
Loans	236,143,000	243,082,000
Pass | Commercial real estate | Construction | Business Activity
Credit quality information
Loans	179,868,000	166,295,000
Pass | Commercial real estate | Construction | Acquired Loans
Credit quality information
Loans	2,765,000	2,904,000
Pass | Commercial real estate | Single and multi-family | Business Activity
Credit quality information
Loans	140,022,000	137,533,000
Pass | Commercial real estate | Single and multi-family | Acquired Loans
Credit quality information
Loans	41,145,000	44,497,000
Pass | Commercial real estate | Other commercial real estate | Business Activity
Credit quality information
Loans	1,023,304,000	959,836,000
Pass | Commercial real estate | Other commercial real estate | Acquired Loans
Credit quality information
Loans	192,233,000	195,681,000
Pass | Commercial real estate | Business loans | Business Activity
Credit quality information
Loans	764,805,000	746,092,000
Pass | Commercial real estate | Business loans | Acquired Loans
Credit quality information
Loans	44,922,000	45,757,000
Pass | Commercial real estate | Business loans | Asset based lending | Business Activity
Credit quality information
Loans	354,106,000	341,246,000
Pass | Commercial real estate | Business loans | Other commercial and industrial loans | Business Activity
Credit quality information
Loans	410,699,000	404,846,000
Pass | Commercial real estate | Business loans | Other commercial and industrial loans | Acquired Loans
Credit quality information
Loans	44,922,000	45,757,000
Special mention
Credit quality information
Loans	11,461,000	17,913,000
Special mention | Business Activity
Credit quality information
Loans	8,175,000	9,113,000
Special mention | Acquired Loans
Credit quality information
Loans	3,286,000	8,800,000
Special mention | Residential | Mortgages | Minimum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	60 days
Special mention | Residential | Mortgages | Maximum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	89 days
Special mention | Residential | Mortgages | Business Activity
Credit quality information
Loans	888,000	556,000
Special mention | Residential | Mortgages | Acquired Loans
Credit quality information
Loans	707,000	638,000
Special mention | Residential | Mortgages | Acquired Loans | Minimum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	60 days
Special mention | Residential | Mortgages | Acquired Loans | Maximum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	89 days
Special mention | Residential | Mortgages | 1-4 family | Business Activity
Credit quality information
Loans	888,000	146,000
Special mention | Residential | Mortgages | 1-4 family | Acquired Loans
Credit quality information
Loans	707,000	638,000
Special mention | Residential | Mortgages | Construction | Business Activity
Credit quality information
Loans		410,000
Special mention | Commercial real estate | Business Activity
Credit quality information
Loans	6,891,000	6,933,000
Special mention | Commercial real estate | Acquired Loans
Credit quality information
Loans	2,328,000	5,401,000
Special mention | Commercial real estate | Single and multi-family | Acquired Loans
Credit quality information
Loans	120,000	533,000
Special mention | Commercial real estate | Other commercial real estate | Business Activity
Credit quality information
Loans	6,891,000	6,933,000
Special mention | Commercial real estate | Other commercial real estate | Acquired Loans
Credit quality information
Loans	2,208,000	4,868,000
Special mention | Commercial real estate | Business loans | Business Activity
Credit quality information
Loans	187,000	560,000
Special mention | Commercial real estate | Business loans | Acquired Loans
Credit quality information
Loans		1,723,000
Special mention | Commercial real estate | Business loans | Other commercial and industrial loans | Business Activity
Credit quality information
Loans	187,000	560,000
Special mention | Commercial real estate | Business loans | Other commercial and industrial loans | Acquired Loans
Credit quality information
Loans		1,723,000
Substandard
Credit quality information
Loans	89,494,000	90,834,000
Substandard | Business Activity
Credit quality information
Loans	68,228,000	66,995,000
Substandard | Acquired Loans
Credit quality information
Loans	21,266,000	23,839,000
Substandard | Residential | Mortgages | Minimum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	90 days
Substandard | Residential | Mortgages | Business Activity
Credit quality information
Loans	4,480,000	4,053,000
Substandard | Residential | Mortgages | Acquired Loans
Credit quality information
Loans	1,930,000	1,651,000
Substandard | Residential | Mortgages | Acquired Loans | Minimum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	90 days
Substandard | Residential | Mortgages | 1-4 family | Business Activity
Credit quality information
Loans	4,066,000	4,053,000
Substandard | Residential | Mortgages | 1-4 family | Acquired Loans
Credit quality information
Loans	1,930,000	1,651,000
Substandard | Residential | Mortgages | Construction | Business Activity
Credit quality information
Loans	414,000
Substandard | Commercial real estate | Business Activity
Credit quality information
Loans	61,832,000	69,406,000
Substandard | Commercial real estate | Acquired Loans
Credit quality information
Loans	21,638,000	23,008,000
Substandard | Commercial real estate | Construction | Business Activity
Credit quality information
Loans	2,932,000	2,894,000
Substandard | Commercial real estate | Construction | Acquired Loans
Credit quality information
Loans	1,281,000	1,297,000
Substandard | Commercial real estate | Single and multi-family | Business Activity
Credit quality information
Loans	2,275,000	2,517,000
Substandard | Commercial real estate | Single and multi-family | Acquired Loans
Credit quality information
Loans	7,164,000	8,138,000
Substandard | Commercial real estate | Other commercial real estate | Business Activity
Credit quality information
Loans	56,625,000	63,995,000
Substandard | Commercial real estate | Other commercial real estate | Acquired Loans
Credit quality information
Loans	13,193,000	13,573,000
Substandard | Commercial real estate | Business loans | Business Activity
Credit quality information
Loans	13,679,000	6,539,000
Substandard | Commercial real estate | Business loans | Acquired Loans
Credit quality information
Loans	3,222,000	3,695,000
Substandard | Commercial real estate | Business loans | Other commercial and industrial loans | Business Activity
Credit quality information
Loans	13,679,000	6,539,000
Substandard | Commercial real estate | Business loans | Other commercial and industrial loans | Acquired Loans
Credit quality information
Loans	3,222,000	3,695,000
Doubtful | Commercial real estate | Business Activity
Credit quality information
Loans	73,000	73,000
Doubtful | Commercial real estate | Other commercial real estate | Business Activity
Credit quality information
Loans	73,000	73,000
Performing | Consumer | Business Activity
Credit quality information
Loans	605,750,000	597,699,000
Performing | Consumer | Acquired Loans
Credit quality information
Loans	147,727,000	167,550,000
Performing | Consumer | Home equity | Business Activity
Credit quality information
Loans	254,176,000	251,524,000
Performing | Consumer | Home equity | Acquired Loans
Credit quality information
Loans	61,371,000	65,368,000
Performing | Consumer | Auto and other | Business Activity
Credit quality information
Loans	351,574,000	346,175,000
Performing | Consumer | Auto and other | Acquired Loans
Credit quality information
Loans	86,356,000	102,182,000
Performing | Consumer | Other | Maximum
Credit quality information
Period within which loans are current, based on which risk rating is assigned	119 days
Performing | Consumer | Other | Acquired Loans | Maximum
Credit quality information
Period within which loans are current, based on which risk rating is assigned	119 days
Nonperforming | Consumer | Business Activity
Credit quality information
Loans	1,444,000	1,462,000
Nonperforming | Consumer | Acquired Loans
Credit quality information
Loans	1,589,000	1,752,000
Nonperforming | Consumer | Home equity | Business Activity
Credit quality information
Loans	1,192,000	1,157,000
Nonperforming | Consumer | Home equity | Acquired Loans
Credit quality information
Loans	876,000	583,000
Nonperforming | Consumer | Auto and other | Business Activity
Credit quality information
Loans	252,000	305,000
Nonperforming | Consumer | Auto and other | Acquired Loans
Credit quality information
Loans	713,000	1,169,000
Nonperforming | Consumer | Other | Minimum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	120 days
Nonperforming | Consumer | Other | Acquired Loans | Maximum
Credit quality information
Delinquency period of loans based on which risk rating is assigned to loans	120 days
Non-Accrual
Credit quality information
Loans	22,009,000	21,705,000
Non-Accrual | Business Activity
Credit quality information
Loans	14,636,000	14,778,000
Non-Accrual | Acquired Loans
Credit quality information
Loans	7,373,000	6,927,000
Classified
Credit quality information
Loans	111,503,000	112,539,000
Classified | Business Activity
Credit quality information
Loans	82,864,000	81,773,000
Classified | Acquired Loans
Credit quality information
Loans	28,639,000	30,766,000
Criticized
Credit quality information
Loans	122,964,000	130,452,000
Criticized | Business Activity
Credit quality information
Loans	91,039,000	90,886,000
Criticized | Acquired Loans
Credit quality information
Loans	31,925,000	$ 39,566,000