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Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans - (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans      
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 $ 618,803,000 $ 602,546,000  
Fair value of acquired loans   55,850,000  
Net reductions for payments, foreclosures, and accretion (22,072,000) (29,895,000)  
Change in the allowance for loan losses on acquired loans 543,000 (1,161,000)  
Balance at the end of the period 597,274,000 627,340,000  
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans      
Balance at beginning of period 133,096,000 155,379,000  
Accretion (12,366,000) (15,214,000)  
Reclass of nonaccretable difference due to improvement in expected cash flows 9,204,000 5,062,000  
Other changes, net (76,000) (107,000)  
Balance at end of period 129,858,000 149,723,000  
Decline in accretable yield balance 3,200,000    
Improved expected cash flows $ 9,200,000    
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   $ 4,603,000