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ACQUISITION - Schedule of Components of Consideration Paid (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Common stock issued   $ 0 $ 200,364 $ 0
Cash   $ 0 $ 23,941 $ 0
Diboll State Bancshares, Inc.        
Business Acquisition [Line Items]        
Common stock issued $ 200,364      
Cash 23,941      
Total consideration transferred $ 224,305