ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses for the Current and Comparable Quarter and Year-to-Date (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Receivables [Abstract]
Balance at beginning of period	$ 42,027	$ 47,047	$ 43,829	$ 47,777
Provision for loan and lease losses	1,093	1,413	2,281	6,863
Loans charged off	(1,816)	(5,111)	(6,427)	(12,515)
Recoveries	1,150	2,165	2,771	3,389
Balance at end of period	42,454	45,514	42,454	45,514
Total loans	$ 4,449,972	$ 3,430,916	$ 4,449,972	$ 3,430,916
Allowance for loan and lease losses to total ending loans	0.95%	1.33%	0.95%	1.33%