LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 loan	Dec. 31, 2011 loan
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	310	349
Principal Balance 30-59 Days	$ 14,109	$ 12,221
Number of Loans 60-89 Days	72	106
Principal Balance 60-89 Days	5,450	9,902
Number of Loans 90 Days or More	149	172
Principal Balance 90 Days or More	17,295	16,385
Number of Loans Total Past Due	531	627
Principal Balance Total Past Due	36,854	38,508
Current	4,482,157	3,755,882
Total Financing Receivables	4,519,011	3,794,390
Recorded Investment >90 Days and Accruing	52	41
Commercial and Industrial [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	14	21
Principal Balance 30-59 Days	1,305	2,143
Number of Loans 60-89 Days	7	10
Principal Balance 60-89 Days	336	2,709
Number of Loans 90 Days or More	23	20
Principal Balance 90 Days or More	1,875	1,279
Number of Loans Total Past Due	44	51
Principal Balance Total Past Due	3,516	6,131
Current	683,995	569,585
Total Financing Receivables	687,511	575,716
Recorded Investment >90 Days and Accruing
Commercial Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	19	7
Principal Balance 30-59 Days	5,028	3,684
Number of Loans 60-89 Days	8	7
Principal Balance 60-89 Days	2,316	2,522
Number of Loans 90 Days or More	31	29
Principal Balance 90 Days or More	6,054	6,737
Number of Loans Total Past Due	58	43
Principal Balance Total Past Due	13,398	12,943
Current	2,108,755	1,834,711
Total Financing Receivables	2,122,153	1,847,654
Recorded Investment >90 Days and Accruing
Commercial Construction [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days
Principal Balance 30-59 Days
Number of Loans 60-89 Days
Principal Balance 60-89 Days
Number of Loans 90 Days or More		3
Principal Balance 90 Days or More		280
Number of Loans Total Past Due		3
Principal Balance Total Past Due		280
Current	188,768	128,624
Total Financing Receivables	188,768	128,904
Recorded Investment >90 Days and Accruing
Small Business [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	20	19
Principal Balance 30-59 Days	750	320
Number of Loans 60-89 Days	8	3
Principal Balance 60-89 Days	94	21
Number of Loans 90 Days or More	10	12
Principal Balance 90 Days or More	320	148
Number of Loans Total Past Due	38	34
Principal Balance Total Past Due	1,164	489
Current	77,430	78,020
Total Financing Receivables	78,594	78,509
Recorded Investment >90 Days and Accruing
Residential Real Estate [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	17	14
Principal Balance 30-59 Days	3,053	2,770
Number of Loans 60-89 Days	7	10
Principal Balance 60-89 Days	1,848	3,208
Number of Loans 90 Days or More	40	31
Principal Balance 90 Days or More	7,501	6,065
Number of Loans Total Past Due	64	55
Principal Balance Total Past Due	12,402	12,043
Current	592,266	404,527
Total Financing Receivables	604,668	416,570
Recorded Investment >90 Days and Accruing
Residential Construction [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days
Principal Balance 30-59 Days
Number of Loans 60-89 Days
Principal Balance 60-89 Days
Number of Loans 90 Days or More
Principal Balance 90 Days or More
Number of Loans Total Past Due
Principal Balance Total Past Due
Current	8,213	9,631
Total Financing Receivables	8,213	9,631
Recorded Investment >90 Days and Accruing
Home Equity [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	32	28
Principal Balance 30-59 Days	2,756	1,483
Number of Loans 60-89 Days	10	19
Principal Balance 60-89 Days	632	1,139
Number of Loans 90 Days or More	17	19
Principal Balance 90 Days or More	1,392	1,502
Number of Loans Total Past Due	59	66
Principal Balance Total Past Due	4,780	4,124
Current	797,369	691,939
Total Financing Receivables	802,149	696,063
Recorded Investment >90 Days and Accruing
Consumer - Other [Member]
Age Analysis of Past Due Financing Receivables
Number of Loans 30-59 Days	208	260
Principal Balance 30-59 Days	1,217	1,821
Number of Loans 60-89 Days	32	57
Principal Balance 60-89 Days	224	303
Number of Loans 90 Days or More	28	58
Principal Balance 90 Days or More	153	374
Number of Loans Total Past Due	268	375
Principal Balance Total Past Due	1,594	2,498
Current	25,361	38,845
Total Financing Receivables	26,955	41,343
Recorded Investment >90 Days and Accruing	$ 52	$ 41