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ACQUISITION - Schedule of components of consideration paid (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 17, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Common stock issued   $ 0 $ 151,891 $ 0
OmniAmerican Bancorp, Inc.        
Business Acquisition [Line Items]        
Common stock issued $ 151,891      
Acquisition, cash paid 157,408      
Share-based compensation expense [1] 8,874      
Reimbursement of contract cancellation fees 1,815      
Non-compete agreements 300      
Total consideration paid $ 298,310      
[1] In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense.