LOANS (covered) - Changes in Covered Other Real Estate Owned (Detail) (Covered Loans, USD $) In Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 35,257	$ 12,916
Additions	40,746	32,064
Disposals	27,932	9,280
Write-downs	5,233	443
Balance at end of period	42,838	35,257
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	38,431	22,237
Disposals	20,940	4,744
Write-downs	4,138	414
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	2,315	9,827
Disposals	6,992	4,536
Write-downs	$ 1,095	$ 29