LOANS (excluding covered loans) - Changes in Other Real Estate Owned (Detail) (Non 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	$ 11,317	$ 17,907
Additions	5,463	710
Disposals	761	377
Write-downs	983	3,287
Balance at end of period	15,036	14,953
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	4,541	0
Disposals	462	232
Write-downs	958	3,144
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	922	710
Disposals	299	145
Write-downs	$ 25	$ 143