LOANS AND LEASES (Details 9) (Covered loans, USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Covered loans
Carrying amount of covered acquired impaired loans
Balance at the beginning of the year	$ 493,846,000
Accretion	10,346,000
Payments received	(40,758,000)
Provision for credit losses	(3,137,000)
Balance at the end of the year	460,297,000
Accretable yield of covered acquired impaired loans
Balance at the beginning of the year	(196,022,000)
Accretion	10,346,000
Decrease in expected cash flows, net	9,670,000
Balance at the end of the year	(176,006,000)
Non-impaired covered loans
Non-impaired covered loans from Los Padres acquisition	$ 22,800,000	$ 23,400,000