LOANS, Amount of Business Lending Loans by Credit Quality Category (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 4,025,455	$ 3,865,576
Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,214,796	1,233,944
Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,664,922	3,418,221
Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,025,910	1,002,854
Legacy Loan [Member] | All Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,639,012	2,415,367
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	360,533	447,355
Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	188,886	231,090
Acquired Loans [Member] | All Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	171,647	216,265
Pass [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	960,673	963,338
Pass [Member] | Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	842,417	818,469
Pass [Member] | Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	118,256	144,869
Special Mention [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	125,755	125,067
Special Mention [Member] | Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	95,057	92,739
Special Mention [Member] | Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	30,698	32,328
Classified [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	116,910	130,167
Classified [Member] | Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	86,915	90,035
Classified [Member] | Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	29,995	40,132
Doubtful [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,521	1,611
Doubtful [Member] | Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,521	1,611
Doubtful [Member] | Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Acquired Impaired [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,937	13,761
Acquired Impaired [Member] | Legacy Loan [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Acquired Impaired [Member] | Acquired Loans [Member] | Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,937	13,761
Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,624,499	2,403,261
Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	169,507	213,201
Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,513	12,106
Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,140	3,064
Consumer Mortgage [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,487,326	1,345,287
Consumer Mortgage [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	83,281	103,128
Consumer Mortgage [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,475,386	1,334,868
Consumer Mortgage [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	81,628	100,443
Consumer Mortgage [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,940	10,419
Consumer Mortgage [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,653	2,685
Consumer Indirect [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	708,529	637,357
Consumer Indirect [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,781	10,161
Consumer Indirect [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	708,135	637,284
Consumer Indirect [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,781	10,161
Consumer Indirect [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	394	73
Consumer Indirect [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Direct [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	168,695	156,266
Consumer Direct [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,801	15,208
Consumer Direct [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	168,554	156,187
Consumer Direct [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,777	15,208
Consumer Direct [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	141	79
Consumer Direct [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	24	0
Home Equity [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	274,462	276,457
Home Equity [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	73,784	87,768
Home Equity [Member] | Performing [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	272,424	274,922
Home Equity [Member] | Performing [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	73,321	87,389
Home Equity [Member] | Nonperforming [Member] | Legacy Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,038	1,535
Home Equity [Member] | Nonperforming [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 463	$ 379