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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans $ 10,692,423 $ 10,937,807      
Unearned income (4,015) (4,160)      
Loans, net of unearned income 10,688,408 10,933,647 $ 9,769,377    
Allowance for credit losses (173,106) (176,144) (120,185) $ (52,162)  
Loans, net 10,515,302 10,757,503      
Commercial, financial, agricultural          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 2,249,287 2,536,984      
Loans, net of unearned income 2,249,287   1,424,576    
Allowance for credit losses (37,592) (39,031) (25,937) (10,658)  
Lease financing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 79,271 80,022      
Loans, net of unearned income 75,256   84,679    
Allowance for credit losses (1,546) (1,624) (1,588)   $ (910)
Real estate – construction:          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 955,918 858,104      
Loans, net of unearned income 955,918   787,895    
Allowance for credit losses (14,977) (16,047) (10,924) (5,029)  
Real estate – construction: | Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 255,356 246,673      
Real estate – construction: | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 700,562 611,431      
Real estate – 1-4 family mortgage:          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 2,686,061 2,698,308      
Loans, net of unearned income 2,686,061   2,846,301    
Allowance for credit losses (31,694) (32,165) (27,320) (9,814)  
Real estate – 1-4 family mortgage: | Primary          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 1,766,751 1,750,951      
Real estate – 1-4 family mortgage: | Home equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 504,620 513,160      
Real estate – 1-4 family mortgage: | Rental/investment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 285,779 296,364      
Real estate – 1-4 family mortgage: | Land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 128,911 137,833      
Real estate – commercial mortgage:          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 4,549,027 4,554,852      
Loans, net of unearned income 4,549,027   4,308,708    
Allowance for credit losses (76,225) (76,127) (44,237) (24,990)  
Real estate – commercial mortgage: | Land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 136,388 149,579      
Real estate – commercial mortgage: | Owner-occupied          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 1,644,770 1,657,806      
Real estate – commercial mortgage: | Non-owner occupied          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 2,767,869 2,747,467      
Installment loans to individuals          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gross loans 172,859 209,537      
Loans, net of unearned income 172,859   317,218    
Allowance for credit losses $ (11,072) $ (11,150) $ (10,179) $ (761)