ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses on Covered Loans for the Previous Five Quarters (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Receivables [Abstract]
Balance at beginning of period	$ 45,190	$ 48,895	$ 48,327	$ 46,156	$ 42,835
Provision for loan and lease losses	9,042	5,283	6,622	6,047	12,951
Loans charged-off	(9,684)	(9,568)	(9,058)	(5,163)	(10,118)
Recoveries	948	580	3,004	1,287	488
Balance at end of period	$ 45,496	$ 45,190	$ 48,895	$ 48,327	$ 46,156