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ACQUISITIONS (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Oct. 01, 2015
USD ($)
location
$ / shares
shares
Oct. 17, 2014
USD ($)
branch
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
ACQUISITIONS            
Goodwill     $ 85,291,000 $ 85,291,000 $ 85,291,000  
Merger related costs incurred     445,000 456,000    
SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank            
ACQUISITIONS            
Total assets           $ 348,700,000
Total loans           248,200,000
Total deposits           280,500,000
Total shareholders' equity           $ 33,700,000
Patriot Bancshares Inc            
ACQUISITIONS            
Total assets $ 1,400,000,000          
Total loans 1,100,000,000          
Total deposits 1,100,000,000          
Total shareholders' equity $ 125,200,000          
Number of shares issued upon merger (in shares) | shares 10.4          
Value of stock issued upon merger $ 123,700,000          
Closing acquisition share price (in dollars per share) | $ / shares $ 11.85          
Value of preferred stock outstanding $ 27,300,000          
Goodwill, initial amount recognized       55,200,000    
Deferred tax assets, net       7,300,000    
Goodwill, deductible for tax purposes       0    
Merger related costs incurred     265,000 405,000    
SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank            
ACQUISITIONS            
Total deposits         $ 3,500,000  
Number of branches | branch   4        
Cash paid in connection with acquisitions   $ 46,400,000        
Goodwill   $ 14,500,000        
Merger related costs incurred     $ 180,000 51,000    
Core Deposit Intangibles | Patriot Bancshares Inc            
ACQUISITIONS            
Core deposit intangibles       $ 8,300,000    
Houston | Patriot Bancshares Inc            
ACQUISITIONS            
Number of locations in acquired entity | location 6          
Dallas            
ACQUISITIONS            
Number of branches | branch   1        
Dallas | Patriot Bancshares Inc            
ACQUISITIONS            
Number of locations in acquired entity | location 2          
Fanin County, Texas | Patriot Bancshares Inc            
ACQUISITIONS            
Number of locations in acquired entity | location 1          
Plano Texas            
ACQUISITIONS            
Number of branches | branch   2        
Louisville, Kentucky            
ACQUISITIONS            
Number of branches | branch   1        
Minimum | Core Deposit Intangibles            
ACQUISITIONS            
Useful life     6 years      
Maximum | Core Deposit Intangibles            
ACQUISITIONS            
Useful life     19 years