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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
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans        
Decline in accretable yield balance   $ 22,000,000    
Percentage of loss adjustment based on most current collateral value 90.00      
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     $ 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     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   602,546,000 $ 733,870,000 919,402,000
Fair value of acquired loans   126,781,000    
Net reductions for payments, foreclosures, and accretion   (109,292,000) (131,635,000) (189,191,000)
Change in the allowance for loan losses on acquired loans   1,232,000 (311,000) (3,659,000)
Balance at the end of the period 733,870,000 618,803,000 602,546,000 733,870,000
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans        
Balance at beginning of period   155,379,000 201,538,000 306,826,000
Accretion   (57,434,000) (72,757,000) (97,847,000)
Reclass of nonaccretable difference due to improvement in expected cash flows   21,890,000 25,808,000 61,985,000
Other changes, net   (478,000) 790,000 (69,426,000)
Balance at end of period $ 201,538,000 133,096,000 $ 155,379,000 $ 201,538,000
Acquired credit impaired loans | Southeastern Bank Financial        
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans        
Addition from acquisition   4,910,000    
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   $ 8,829,000