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Loans Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Oct. 19, 2017
Oct. 18, 2017
Jun. 30, 2017
May 15, 2017
May 14, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 09, 2016
Sep. 08, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans $ 11,723,171 $ 10,779,685                  
Loans allowance 56,694 42,086           $ 37,240      
Loans acquired                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans 3,292,783 5,074,076                  
Loans allowance $ 95 418           $ 954      
OKSB Merger                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans   1,985,000                  
Loans acquired   2,021,000 $ 1,996,453 $ 2,039,524              
Discount   36,300                  
OKSB Merger | Impaired                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans   11,400                  
Loans acquired   18,100                  
Discount   6,700                  
First Texas Merger                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans   2,208,000                  
Loans acquired   2,246,000 $ 2,208,378 $ 2,246,212              
Discount   $ 37,800                  
Hardeman County Investment Company, Inc.                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans         $ 249,200            
Loans acquired         254,200 $ 251,649 $ 257,641        
Discount         5,000            
Hardeman County Investment Company, Inc. | Impaired                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans         2,400            
Loans acquired         3,400            
Discount         $ 990            
Citizens National Bank                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans                 $ 340,100    
Loans acquired                 348,800 $ 340,850 $ 350,361
Discount                 8,700    
Citizens National Bank | Impaired                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans                 757    
Loans acquired                 1,600    
Discount                 $ 848