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ACQUISITION - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 30, 2017
USD ($)
banking_offices
$ / shares
shares
Dec. 31, 2018
USD ($)
banking_offices
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Number of branches | banking_offices   59    
Acquisition, goodwill   $ 201,116 $ 201,246  
Acquisition expense   2,413 4,352 $ 0
Acquisition, legal and consulting fees   4,035 3,844 4,946
Acquisition, software and data processing expense   3,996 3,027 2,911
Diboll State Bancshares, Inc.        
Business Acquisition [Line Items]        
Percentage of company acquired 100.00%      
Number of branches | banking_offices 17      
Acquisition, number of shares issued | shares 5,500,000      
Company stock consideration, stock issued per each share of acquiree stock (in shares) | shares 6.5021      
Cash consideration, per share of acquiree stock (in dollars per share) | $ / shares $ 28.12      
Acquisition, closing stock price per share (in dollars per share) | $ / shares $ 36.2      
Acquisition, total merger consideration $ 224,305      
Acquisition, assets 1,030,000      
Acquisition, loans 621,318 621,318    
Acquisition, investment securities 234,447 234,447    
Acquisition, liabilities assumed 910,700      
Acquisition, deposits 899,300      
Acquisition, goodwill 109,726 109,596 109,726  
Acquisition expense   4,400    
Acquisition, legal and consulting fees   2,400    
Acquisition, software and data processing expense   $ 1,900    
Cost related to issuance of shares related to the merger 277      
Pro forma net income (loss)     64,100 58,000
Pro forma revenue     $ 270,900 $ 257,800
Core deposits | Diboll State Bancshares, Inc.        
Business Acquisition [Line Items]        
Acquisition, finite-lived intangible assets $ 14,700      
Amortization period 9 years      
Trust Relationship Intangible | Diboll State Bancshares, Inc.        
Business Acquisition [Line Items]        
Acquisition, finite-lived intangible assets $ 5,400      
Amortization period 13 years      
Non-solicitation Agreements | Diboll State Bancshares, Inc.        
Business Acquisition [Line Items]        
Acquisition, finite-lived intangible assets $ 240      
Amortization period 3 years