LOANS (excluding covered loans) - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Non Covered Loans Commercial	Dec. 31, 2010 Non Covered Loans Commercial	Sep. 30, 2011 Commercial Franchise Operations Equipment months	Sep. 30, 2011 Commercial Franchise Operations Leasehold Improvements months	Sep. 30, 2011 Non Covered Loans	Dec. 31, 2010 Non Covered Loans	Sep. 30, 2011 Non Covered Loans Commercial Real Estate Developer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan terms for franchisees, principally quick service and casual dining restaurants							84	180
Minimum loans reviewed to determine if a specific allowance is necessary					$ 250,000
Write down of other real estate owned					3,341,000	727,000			3,587,000	899,000	3,100,000
Gain (loss) on sale of other real estate owned	$ 287,000	$ 152,000	$ (3,198,000)	$ (456,000)							$ 300,000