LOANS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Activity in the allowance for loan losses
Balance at end of year	$ 33,208	$ 32,444
Allowance For Loan Losses
Total	33,208	32,444
Loans receivable: Balance at end of year
Total loans	3,988,654	2,956,570
Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	31,898	31,898	31,816
Charged-off loans	9,067	7,696	10,685
Recoveries on charged-off loans	416	679	2,241
Provision for loan losses	8,644	7,017	8,526
Balance at end of year	31,891	31,898	31,898
Allowance For Loan Losses
Individually evaluated for impairment	3,264	2,775	2,489
Collectively evaluated for impairment	28,627	29,123	29,409
Total	31,891	31,898	31,898
Loans receivable: Balance at end of year
Individually evaluated for impairment	40,688	41,483	14,153
Collectively evaluated for impairment	2,584,948	2,220,768	2,128,009
Total loans	2,625,636	2,262,251	2,142,162
Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	546
Charged-off loans	383
Recoveries on charged-off loans	208
Provision for loan losses	946	546
Balance at end of year	1,317	546
Allowance For Loan Losses
Individually evaluated for impairment	55
Collectively evaluated for impairment	1,262	546
Total	1,317	546
Loans receivable: Balance at end of year
Individually evaluated for impairment	1,257
Collectively evaluated for impairment	1,361,761	694,319
Total loans	1,363,018	694,319
Residential mortgages
Loans receivable: Balance at end of year
Total loans	1,324,251	1,020,435
Residential mortgages | Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	3,150	3,077	2,897
Charged-off loans	2,604	1,322	409
Recoveries on charged-off loans	103	231	213
Provision for loan losses	5,279	1,164	376
Balance at end of year	5,928	3,150	3,077
Allowance For Loan Losses
Individually evaluated for impairment	342	449	246
Collectively evaluated for impairment	5,586	2,701	2,831
Total	5,928	3,150	3,077
Loans receivable: Balance at end of year
Individually evaluated for impairment	6,362	5,655	1,352
Collectively evaluated for impairment	884,304	676,003	643,621
Total loans	890,666	681,658	644,973
Residential mortgages | Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	281
Charged-off loans	43
Provision for loan losses	271	281
Balance at end of year	509	281
Allowance For Loan Losses
Individually evaluated for impairment	55
Collectively evaluated for impairment	454	281
Total	509	281
Loans receivable: Balance at end of year
Individually evaluated for impairment	371
Collectively evaluated for impairment	433,214	338,777
Total loans	433,585	338,777
Commercial mortgages
Loans receivable: Balance at end of year
Total loans	1,413,544	1,156,241
Commercial mortgages | Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	22,095	19,461	19,282
Charged-off loans	4,229	4,047	6,403
Recoveries on charged-off loans	52	189	794
Provision for loan losses	945	6,492	5,788
Balance at end of year	18,863	22,095	19,461
Allowance For Loan Losses
Individually evaluated for impairment	1,444	1,722	2,151
Collectively evaluated for impairment	17,419	20,373	17,310
Total	18,863	22,095	19,461
Loans receivable: Balance at end of year
Individually evaluated for impairment	30,287	34,074	3,798
Collectively evaluated for impairment	932,606	919,364	921,775
Total loans	962,893	953,438	925,573
Commercial mortgages | Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	158
Provision for loan losses	232	158
Balance at end of year	390	158
Allowance For Loan Losses
Collectively evaluated for impairment	390	158
Total	390	158
Loans receivable: Balance at end of year
Individually evaluated for impairment	886
Collectively evaluated for impairment	449,765	202,803
Total loans	450,651	202,803
Commercial business loans
Loans receivable: Balance at end of year
Total loans	600,126	410,292
Commercial business loans | Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	4,540	6,038	6,011
Charged-off loans	697	1,443	2,685
Recoveries on charged-off loans	96	109	1,094
Provision for loan losses	1,666	(164)	1,618
Balance at end of year	5,605	4,540	6,038
Allowance For Loan Losses
Individually evaluated for impairment	1,205	116	92
Collectively evaluated for impairment	4,400	4,424	5,946
Total	5,605	4,540	6,038
Loans receivable: Balance at end of year
Individually evaluated for impairment	2,821	564	8,606
Collectively evaluated for impairment	487,106	361,202	277,481
Total loans	489,927	361,766	286,087
Commercial business loans | Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	38
Provision for loan losses	58	38
Balance at end of year	96	38
Allowance For Loan Losses
Collectively evaluated for impairment	96	38
Total	96	38
Loans receivable: Balance at end of year
Collectively evaluated for impairment	110,199	48,526
Total loans	110,199	48,526
Consumer loans
Loans receivable: Balance at end of year
Total loans	650,733	369,602
Consumer loans | Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	2,203	2,099	2,749
Charged-off loans	1,537	884	1,188
Recoveries on charged-off loans	165	150	140
Provision for loan losses	635	838	398
Balance at end of year	1,466	2,203	2,099
Allowance For Loan Losses
Individually evaluated for impairment	273	488
Collectively evaluated for impairment	1,193	1,715	2,099
Total	1,466	2,203	2,099
Loans receivable: Balance at end of year
Individually evaluated for impairment	1,218	1,190	397
Collectively evaluated for impairment	280,932	264,199	285,132
Total loans	282,150	265,389	285,529
Consumer loans | Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	87
Charged-off loans	340
Recoveries on charged-off loans	208
Provision for loan losses	359	87
Balance at end of year	314	87
Allowance For Loan Losses
Collectively evaluated for impairment	314	87
Total	314	87
Loans receivable: Balance at end of year
Collectively evaluated for impairment	368,583	104,213
Total loans	368,583	104,213
Unallocated | Loans from Business Activities
Activity in the allowance for loan losses
Balance at beginning of year	(90)	1,223	877
Provision for loan losses	119	(1,313)	346
Balance at end of year	29	(90)	1,223
Allowance For Loan Losses
Collectively evaluated for impairment	29	(90)	1,223
Total	29	(90)	1,223
Unallocated | Loans from Business Combinations
Activity in the allowance for loan losses
Balance at beginning of year	(18)
Provision for loan losses	26	(18)
Balance at end of year	8	(18)
Allowance For Loan Losses
Collectively evaluated for impairment	8	(18)
Total	$ 8	$ (18)