LOANS (excluding covered loans) - Changes in Other Real Estate Owned (Detail) (Non 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	$ 17,907	$ 4,145
Additions	3,937	18,650
Disposals	6,254	3,989
Write-downs	3,587	899
Balance at end of period	12,003	17,907
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	1,328	17,520
Disposals	3,909	2,315
Write-downs	3,341	727
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	2,609	1,130
Disposals	2,345	1,674
Write-downs	$ 246	$ 172