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Mergers and Acquisitions (Details)
Nov. 30, 2017
USD ($)
shares
Jan. 03, 2017
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mergers and Acquisitions        
Deferred tax assets     $ 91,139,000 $ 79,353,000
Deferred Tax Liabilities, Gross     $ 55,936,000 $ 38,650,000
Park Sterling Corporation        
Mergers and Acquisitions        
Fixed exchange ratio for shares issued (in shares) 0.14      
Common stock shares outstanding | shares 7,480,343      
Total purchase price $ 692,959,000      
Value of stock options $ 4,305,000      
Southeastern Bank Financial        
Mergers and Acquisitions        
Fixed exchange ratio for shares issued (in shares)   0.7307    
Common stock shares outstanding | shares   4,978,338    
Total purchase price   $ 435,115,000    
Value of stock options   $ 490,000