NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES
Net interest income	$ 44,329	$ 41,104	$ 87,095	$ 83,041
Provision for loan losses	3,989	2,700	7,385	5,100
Net interest income after provision for loan losses	$ 40,340	$ 38,404	$ 79,710	$ 77,941