LOANS (covered) - Changes in Covered Other Real Estate Owned (Detail) (Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 44,818	$ 35,257
Additions	5,374	12,078
Disposals	5,548	11,602
Write-downs	3,155	2,085
Balance at end of period	41,489	33,648
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	2,750	11,197
Disposals	5,005	9,266
Write-downs	3,084	2,085
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	2,624	881
Disposals	543	2,336
Write-downs	$ 71	$ 0