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GOODWILL AND OTHER INTANGIBLE ASSETS (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
segment
business_division
Goodwill and Intangible Assets Disclosure [Abstract]    
Number of business divisions | business_division   3
Number of operating segments | segment   3
Premiums on Acquired Deposits    
Period for which the company provided a net income projection under the income approach to determine the fair value of the reporting units   3 years
Goodwill impairment   $ 0
MetroCorp    
Premiums on Acquired Deposits    
Additional tax adjustment in connection with a business combination $ 11,000,000