LOANS (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Loans receivable: balance at end of period
Total loans	$ 4,680,600,000	$ 4,180,523,000
Business Activity
Loans receivable: balance at end of period
Individually evaluated for impairment	26,448,000	30,561,000
Collectively evaluated	3,892,432,000	3,138,630,000
Total loans	3,918,880,000	3,169,191,000
Acquired Loans
Loans receivable: balance at end of period
Individually evaluated for impairment	6,570,000	8,384,000
Collectively evaluated	755,150,000	1,002,948,000
Total loans	761,720,000	1,011,332,000
Residential | Mortgages
Loans receivable: balance at end of period
Total loans	1,496,204,000	1,384,274,000
Residential | Mortgages | Business Activity
Loans receivable: balance at end of period
Individually evaluated for impairment	3,238,000	6,237,000
Collectively evaluated	1,223,214,000	1,039,658,000
Total loans	1,226,452,000	1,045,895,000
Residential | Mortgages | Acquired Loans
Loans receivable: balance at end of period
Individually evaluated for impairment	695,000	1,568,000
Collectively evaluated	269,057,000	336,811,000
Total loans	269,752,000	338,379,000
Commercial real estate
Loans receivable: balance at end of period
Total loans	1,611,567,000	1,417,120,000
Commercial real estate | Business Activity
Loans receivable: balance at end of period
Individually evaluated for impairment	22,015,000	22,429,000
Collectively evaluated	1,318,061,000	1,037,582,000
Total loans	1,340,076,000	1,060,011,000
Commercial real estate | Acquired Loans
Loans receivable: balance at end of period
Individually evaluated for impairment	5,637,000	6,295,000
Collectively evaluated	265,854,000	350,814,000
Total loans	271,491,000	357,109,000
Commercial real estate | Business loans
Loans receivable: balance at end of period
Total loans	804,366,000	687,293,000
Commercial real estate | Business loans | Business Activity
Loans receivable: balance at end of period
Individually evaluated for impairment	743,000	1,380,000
Collectively evaluated	752,448,000	616,057,000
Total loans	753,191,000	617,437,000
Commercial real estate | Business loans | Acquired Loans
Loans receivable: balance at end of period
Individually evaluated for impairment	39,000	367,000
Collectively evaluated	51,136,000	69,489,000
Total loans	51,175,000	69,856,000
Consumer
Loans receivable: balance at end of period
Total loans	768,463,000	691,836,000
Consumer | Business Activity
Loans receivable: balance at end of period
Individually evaluated for impairment	452,000	515,000
Collectively evaluated	598,709,000	445,333,000
Total loans	599,161,000	445,848,000
Consumer | Acquired Loans
Loans receivable: balance at end of period
Individually evaluated for impairment	199,000	154,000
Collectively evaluated	169,103,000	245,834,000
Total loans	169,302,000	245,988,000
Commercial
Loans receivable: balance at end of period
Total loans	2,415,933,000	2,104,413,000
Commercial | Business Activity
Loans receivable: balance at end of period
Total loans	2,093,267,000	1,677,448,000
Commercial | Acquired Loans
Loans receivable: balance at end of period
Total loans	322,666,000	426,965,000
Commercial | Mortgages | Acquired Loans
Loans receivable: balance at end of period
Total loans	271,491,000	357,109,000
Commercial | Business loans | Business Activity
Loans receivable: balance at end of period
Total loans	753,191,000	617,437,000
Commercial | Business loans | Acquired Loans
Loans receivable: balance at end of period
Total loans	$ 51,175,000	$ 69,856,000