LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Internal risk-rating categories for the Company's commercial portfolio
Total	$ 3,334,561	$ 3,077,026
Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	784,202	687,511
Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,249,260	2,122,153
Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	223,859	188,768
Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	77,240	78,594
Pass [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	3,087,877	2,825,056
Pass [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	736,996	647,984
Pass [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,068,995	1,928,148
Pass [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	210,372	177,693
Pass [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	71,514	71,231
Potential weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	125,464	118,479
Potential weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	21,841	16,420
Potential weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	91,984	92,651
Potential weakness [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	8,608	6,195
Potential weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	3,031	3,213
Definite weakness [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	117,507	129,627
Definite weakness [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	24,409	21,979
Definite weakness [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	85,767	98,688
Definite weakness [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	4,779	4,880
Definite weakness [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,552	4,080
Parital loss probable [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	3,713	3,864
Parital loss probable [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	956	1,128
Parital loss probable [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	2,514	2,666
Parital loss probable [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	100
Parital loss probable [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total	143	70
Definite loss [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total
Definite loss [Member] | Commercial and Industrial [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total
Definite loss [Member] | Commercial Real Estate [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total
Definite loss [Member] | Commercial Construction [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total
Definite loss [Member] | Small Business [Member]
Internal risk-rating categories for the Company's commercial portfolio
Total