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Loans Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 31, 2019
Oct. 30, 2019
Jun. 30, 2019
Apr. 12, 2019
Apr. 11, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 19, 2017
Oct. 18, 2017
Jun. 30, 2017
May 15, 2017
May 14, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans $ 14,425,260           $ 11,723,171            
Loans allowance 68,244           56,694 $ 42,086          
Loans acquired                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans 4,795,184           3,292,783            
Loans allowance 444           95 $ 418          
Landrum Company                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans 1,995,000                        
Loans acquired 2,011,000 $ 2,005,936 $ 2,049,137                    
Discount 15,818                        
Landrum Company | Impaired                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans 11,200                        
Loans acquired 15,823                        
Discount $ 4,600                        
Reliance Bancshares, Inc.                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans       $ 1,097,000                  
Loans acquired       1,127,000 $ 1,096,870 $ 1,138,527              
Discount       30,600                  
Reliance Bancshares, Inc. | Impaired                          
Accounts, Notes, Loans and Financing Receivable [Line Items]                          
Loans       176                  
Loans acquired       385                  
Discount       $ 209                  
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