LOANS AND LEASES (Details 10) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Los Padres
Carrying amount of covered acquired impaired loans
Addition from the Los Padres	$ 405,619,000
Accretable yield of covered acquired impaired loans
Addition from the Los Padres	(144,168,000)
Covered loans
Carrying amount of covered acquired impaired loans
Balance at the beginning of the year	677,014,000	879,486,000	621,686,000
Accretion	49,562,000	65,282,000	52,539,000
Payments received	(233,549,000)	(254,484,000)	(166,858,000)
Provision for credit losses	819,000	(13,270,000)	(33,500,000)
Balance at the end of the year	493,846,000	677,014,000	879,486,000
Accretable yield of covered acquired impaired loans
Balance at the beginning of the year	(259,265,000)	(290,665,000)	(226,446,000)
Accretion	49,562,000	65,282,000	52,539,000
Decrease in expected cash flows, net	13,681,000	(33,882,000)	27,410,000
Balance at the end of the year	(196,022,000)	(259,265,000)	(290,665,000)
Non-impaired covered loans
Non-impaired covered loans from Los Padres acquisition	$ 23,400,000	$ 26,000,000