LOANS (covered) - Carrying Amount of Accretable Yield for Purchased Impaired and Nonimpaired Loans (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 224,694		$ 344,410
Reclassification from non-accretable difference	7,751		14,384
Accretion	(17,947)		(25,919)
Other net activity	(5,828)	[1]	(19,206)	[1]
Balance at end of period	$ 208,670		$ 313,669

[1] Includes the impact of loan repayments and charge-offs.