FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Derivatives	$ 12,678	$ 13,477
Investment securities available-for-sale	897,715	913,601
Liabilities
Derivatives	13,463	14,431
Fair Value, Measurements, Recurring
Assets
Derivatives	0	0
Investment securities available-for-sale	897,715	913,601
Total	897,715	913,601
Liabilities
Derivatives	1,828	954
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
Assets
Derivatives	0	0
Investment securities available-for-sale	8,214	7,976
Total	8,214	7,976
Liabilities
Derivatives	0	0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
Assets
Derivatives	12,678	13,477
Investment securities available-for-sale	889,501	905,625
Total	902,179	919,102
Liabilities
Derivatives	14,506	14,431
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
Assets
Derivatives	0	0
Investment securities available-for-sale	0	0
Total	0	0
Liabilities
Derivatives	0	0
Fair Value, Measurements, Recurring | Netting Adjustments
Assets
Derivatives	(12,678)	(13,477)
Investment securities available-for-sale	0	0
Total	(12,678)	(13,477)
Liabilities
Derivatives	$ (12,678)	$ (13,477)