LOANS, Credit Quality (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	$ 5,372,556	$ 5,333,268	$ 5,234,839
Performing Pass Rated Loans to Total Loans Percent	95.67%	95.45%
Performing Special Mention Loans to Total Loans Percent	1.12%	0.96%
Performing Classified Loans to Total Loans Percent	2.35%	2.60%
Non Performing Loans to Total Loans Percent	0.86%	0.99%
Percent of Loans	100.00%	100.00%
Non-accrual Loans Held-for-sale, Residential Mortgages	1,500
Non-accrual Loans Held-for-sale, Home Equity	600
Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	5,139,982	5,090,493
Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	60,193	51,186
Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	126,353	138,998
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	46,028	52,591
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	2,504,594	2,460,664
Commercial and Industrial [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	2,361,736	2,327,344
Commercial and Industrial [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	51,409	38,873
Commercial and Industrial [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	77,627	79,179
Commercial and Industrial [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	13,822	15,268
CRE - Permanent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,021,271	994,838
CRE - Permanent [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	979,978	944,589
CRE - Permanent [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	7,112	9,191
CRE - Permanent [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	30,143	36,272
CRE - Permanent [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	4,038	4,786
CRE - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	183,586	198,334
CRE - Construction [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	159,862	167,710
CRE - Construction [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,662	2,962
CRE - Construction [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	11,637	15,534
CRE - Construction [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	10,425	12,128
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,204,857	1,193,172
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,139,840	1,112,299
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	8,774	12,153
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	41,780	51,806
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	14,463	16,914
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	648,195	652,225
Residential Mortgages [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	635,690	636,829
Residential Mortgages [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	0	0
Residential Mortgages [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	896	2,243
Residential Mortgages [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	11,609	13,153
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	753,297	762,608
Home Equity [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	748,727	757,064
Home Equity [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	0	0
Home Equity [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	389	137
Home Equity [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	4,181	5,407
All Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	261,613	264,599
All Other Consumer [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	253,989	256,957
All Other Consumer [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	10	160
All Other Consumer [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	5,661	5,633
All Other Consumer [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,953	1,849
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,663,105	1,679,432
Consumer [Member] | Performing Financing Receivable [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	1,638,406	1,650,850
Consumer [Member] | Performing Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	10	160
Consumer [Member] | Performing Financing Receivable [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	6,946	8,013
Consumer [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross	$ 17,743	$ 20,409