LOANS AND LEASES (Details 9) (Covered loans, USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Covered loans
Carrying amount of covered acquired impaired loans
Balance at the beginning of the period	$ 677,014,000
Accretion	38,417,000
Payments received	(168,710,000)
Provision for credit losses	(3,514,000)
Balance at the end of the period	543,207,000
Accretable yield of covered acquired impaired loans
Balance at the beginning of the period	(259,265,000)
Accretion	38,417,000
Decrease in expected cash flows, net	20,616,000
Balance at the end of the period	(200,232,000)
Non-impaired covered loans
Non-impaired covered loans from Los Padres acquisition	$ 24,200,000	$ 26,000,000