LOANS, Allowance Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 89,729	$ 93,252	$ 90,675	$ 96,367
Charge-offs	(7,789)	(5,125)	(10,863)	(10,143)
Recoveries	1,876	1,721	3,004	2,373
Provision	(1,000)	0	(2,000)	(1,251)
Ending balance	84,816	89,848	84,816	89,848
Ending balance of allowance: Individually evaluated for impairment	7,873	4,350	7,873	4,350
Ending balance of allowance: Collectively evaluated for impairment	76,943	85,498	76,943	85,498
Ending balance of loans: Individually evaluated for impairment	50,438	46,315	50,438	46,315
Ending balance of loans: Collectively evaluated for impairment	5,593,394	5,357,441	5,593,394	5,357,441
Loans and Leases Receivable, Gross	6,158,788	5,403,756	6,158,788	5,403,756	$ 6,142,279
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	41,134	40,697	39,982	41,288
Charge-offs	(5,949)	(2,892)	(6,732)	(4,227)
Recoveries	1,075	843	1,436	1,028
Provision	(177)	(570)	1,397	(11)
Ending balance	36,083	38,078	36,083	38,078
Ending balance of allowance: Individually evaluated for impairment	2,234	342	2,234	342
Ending balance of allowance: Collectively evaluated for impairment	33,849	37,736	33,849	37,736
Ending balance of loans: Individually evaluated for impairment	9,355	9,875	9,355	9,875
Ending balance of loans: Collectively evaluated for impairment	2,612,197	2,479,118	2,612,197	2,479,118
Loans and Leases Receivable, Gross	2,621,552	2,488,993	2,621,552	2,488,993
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	18,176	20,197	18,696	22,653
Charge-offs	(5)	(800)	(628)	(1,327)
Recoveries	405	111	522	185
Provision	(1,487)	(945)	(1,501)	(2,948)
Ending balance	17,089	18,563	17,089	18,563
Ending balance of allowance: Individually evaluated for impairment	3,331	2,180	3,331	2,180
Ending balance of allowance: Collectively evaluated for impairment	13,758	16,383	13,758	16,383
Ending balance of loans: Individually evaluated for impairment	18,828	17,794	18,828	17,794
Ending balance of loans: Collectively evaluated for impairment	1,283,043	1,207,640	1,283,043	1,207,640
Loans and Leases Receivable, Gross	1,301,871	1,225,434	1,301,871	1,225,434
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	20,388	21,864	21,390	21,478
Charge-offs	(1,835)	(1,433)	(3,503)	(4,589)
Recoveries	396	767	1,046	1,160
Provision	1,829	372	1,845	3,521
Ending balance	20,778	21,570	20,778	21,570
Ending balance of allowance: Individually evaluated for impairment	2,308	1,828	2,308	1,828
Ending balance of allowance: Collectively evaluated for impairment	18,470	19,742	18,470	19,742
Ending balance of loans: Individually evaluated for impairment	22,255	18,646	22,255	18,646
Ending balance of loans: Collectively evaluated for impairment	1,698,154	1,670,683	1,698,154	1,670,683
Loans and Leases Receivable, Gross	1,720,409	1,689,329	1,720,409	1,689,329
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	10,031	10,494	10,607	10,948
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	835	1,143	259	689
Ending balance	10,866	11,637	10,866	11,637
Ending balance of allowance: Individually evaluated for impairment	0	0	0	0
Ending balance of allowance: Collectively evaluated for impairment	10,866	11,637	10,866	11,637
Ending balance of loans: Individually evaluated for impairment	0	0	0	0
Ending balance of loans: Collectively evaluated for impairment	0	0	0	0
Loans and Leases Receivable, Gross	0	$ 0	0	$ 0
OriginatedLoans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Gross	$ 5,643,832		$ 5,643,832		$ 5,562,087