NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 13) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	$ 249,675	$ 234,535	$ 234,535
Provision for loan losses	6,933	4,327	22,364
Provision allocation for unfunded loan commitments and letters of credit	(215)		(2,157)
Charge-offs	(6,136)		(17,780)
Recoveries	1,879		12,713
Net charge-offs	(4,257)	(672)	(5,067)
Ending balance	252,136		249,675
Ending balance allocated to:
Loans individually evaluated for impairment	26,718		24,143
Loans collectively evaluated for impairment	223,216		223,263
Covered loans acquired with deteriorated credit quality	2,202		2,269
Ending balance	252,136		249,675
Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	50,717	49,349	49,349
Provision for loan losses	(2,744)		1,918
Charge-offs	(282)		(3,197)
Recoveries	136		2,647
Net charge-offs	(146)		(550)
Ending balance	47,827		50,717
Ending balance allocated to:
Loans individually evaluated for impairment	1,853		1,546
Loans collectively evaluated for impairment	45,974		49,171
Ending balance	47,827		50,717
Commercial Real Estate ("CRE")
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	64,677	69,856	69,856
Provision for loan losses	(2,447)		(6,615)
Charge-offs	(320)		(3,357)
Recoveries	829		4,793
Net charge-offs	509		1,436
Ending balance	62,739		64,677
Ending balance allocated to:
Loans individually evaluated for impairment	8,375		8,058
Loans collectively evaluated for impairment	54,364		56,619
Ending balance	62,739		64,677
Commercial and Industrial ("C&I")
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	115,184	105,376	105,376
Provision for loan losses	13,431		12,821
Charge-offs	(5,325)		(7,405)
Recoveries	911		4,392
Net charge-offs	(4,414)		(3,013)
Ending balance	124,201		115,184
Ending balance allocated to:
Loans individually evaluated for impairment	16,490		14,539
Loans collectively evaluated for impairment	107,711		100,645
Ending balance	124,201		115,184
Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	11,352	4,801	4,801
Provision for loan losses	(501)		8,055
Charge-offs	(3)		(2,385)
Recoveries	3		881
Net charge-offs			(1,504)
Ending balance	10,851		11,352
Ending balance allocated to:
Loans collectively evaluated for impairment	10,851		11,352
Ending balance	10,851		11,352
Covered Loans under ASC 310-10 Subject to Allowance for Loan Losses
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	5,476	5,153	5,153
Provision for loan losses	(954)		1,759
Charge-offs	(206)		(1,436)
Net charge-offs	(206)		(1,436)
Ending balance	4,316		5,476
Ending balance allocated to:
Loans collectively evaluated for impairment	4,316		5,476
Ending balance	4,316		5,476
Covered Loans under ASC 310-30 Subject to Allowance for Loan Losses
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	2,269
Provision for loan losses	(67)		2,269
Ending balance	2,202		2,269
Ending balance allocated to:
Covered loans acquired with deteriorated credit quality	2,202		2,269
Ending balance	2,202		2,269
Unallocated
Financing Receivable Allowance for Credit Losses Roll Forward
Provision for loan losses	215		2,157
Provision allocation for unfunded loan commitments and letters of credit	$ (215)		$ (2,157)