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Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans (Details)
 3 Months Ended 12 Months Ended
Nov. 30, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 03, 2017
USD ($)
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Decline in accretable yield balance     $ 34,700,000      
Percentage of loss adjustment based on most current collateral value   90        
Maximum            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Threshold limit of loans for risk assessment by loan officers   $ 500,000        
Minimum            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Threshold limit of loans for risk assessment by loan officers   $ 100,000        
Acquired credit impaired loans            
Changes in the carrying value of acquired loans at the acquisition date            
Balance at the beginning of the period     485,119,000 $ 618,803,000    
Net reductions for payments, foreclosures, and accretion     (127,877,000) (133,707,000)    
Change in the allowance for loan losses on acquired loans     460,000 (23,000)    
Balance at the end of the period     356,782,000 485,119,000 $ 618,803,000  
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Balance at beginning of period     116,754,000 133,096,000 155,379,000  
Park Sterling Corporation ("Park Sterling") acquisition Day 1 adjustment       (1,460,000) 8,829,000  
Contractual interest income     (26,515,000) (33,115,000) (36,690,000)  
Accretion on acquired credit impaired loans     (17,813,000) (19,004,000) (20,841,000)  
Reclass of nonaccretable difference due to improvement in expected cash flows     9,826,000 37,501,000 21,987,000  
Other changes, net     (154,000) (264,000) (478,000)  
Balance at end of period     82,098,000 116,754,000 133,096,000  
Accretion income     44,300,000      
Improved expected cash flows     9,800,000      
Contractual principal and interest $ 113,584,000   452,818,000 $ 626,691,000    
Acquired credit impaired loans | Park Sterling Corporation            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Addition from acquisition         $ 4,910,000  
Acquired non-credit impaired loans accounted under FASB 310 20            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
After fair value adjustment     $ 1,800,000      
Acquired non-credit impaired loans accounted under FASB 310 20 | Southeastern Bank Financial            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Contractual principal and interest           $ 78,963,000
Acquired non-credit impaired loans accounted under FASB 310 20 | Park Sterling Corporation            
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans            
Contractual principal and interest 2,200,000,000          
After fair value adjustment 2,100,000,000          
Fair value adjustment $ 46,500,000,000