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ACQUISITION - Narrative (Details) - OmniAmerican Bancorp, Inc.
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 17, 2014
category
Other Investments    
Business Acquisition [Line Items]    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets $ 1.4  
Other Assets    
Business Acquisition [Line Items]    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets $ (1.0)  
Core deposits    
Business Acquisition [Line Items]    
Number of categories | category   2