FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Derivatives	$ 24,740	$ 14,025
Investment securities available-for-sale	1,164,319	1,190,642
Liabilities
Derivatives	24,853	14,179
Fair Value, Measurements, Recurring
Assets
Derivatives	25,028	14,111
Investment securities available-for-sale	1,164,319	1,190,642
Total	1,189,347	1,204,753
Liabilities
Derivatives	24,952	14,243
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Derivatives	0	0
Investment securities available-for-sale	8,789	8,583
Total	8,789	8,583
Liabilities
Derivatives	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Derivatives	25,028	14,111
Investment securities available-for-sale	1,155,530	1,182,059
Total	1,180,558	1,196,170
Liabilities
Derivatives	24,952	14,243
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 portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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