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LOANS - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance $ 25,791 $ 23,920 $ 23,920      
Provision for loan losses 1,801 1,836 8,364      
Loans charged off (2,872) (1,102) (10,467)      
Recoveries of loans previously charged off 1,480 596 3,974      
Ending balance, Allowance 26,200 25,250 25,791      
Period-end allocation:            
Loans individually evaluated for impairment       $ 5,728 $ 6,018 $ 7,664
Loans collectively evaluated for impairment       20,472 19,773 17,586
Ending balance, Allowance 25,791 23,920 23,920 26,200 25,791 25,250
Loans:            
Individually evaluated for impairment       48,927 52,231 62,789
Collectively evaluated for impairment       6,034,608 5,879,141 5,123,609
Acquired with deteriorated credit quality       106,636 114,983 135,116
Ending balance, Loan       6,190,171 6,046,355 5,321,514
Purchased Loans            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 3,253 1,626 1,626      
Provision for loan losses (747) 706 2,606      
Loans charged off (121) (556) (2,900)      
Recoveries of loans previously charged off 437 420 1,921      
Ending balance, Allowance 2,822 2,196 3,253      
Period-end allocation:            
Loans individually evaluated for impairment       2,822 3,253 2,196
Loans collectively evaluated for impairment       0 0 0
Ending balance, Allowance 3,253 1,626 1,626 2,822 3,253 2,196
Loans:            
Individually evaluated for impairment       28,167 28,165 35,673
Collectively evaluated for impairment       683,784 718,447 836,146
Acquired with deteriorated credit quality       106,636 114,983 135,116
Ending balance, Loan       818,587 861,595 1,006,935
Nonaccrual loan       15,940 15,428  
Purchased Loan Pools            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 1,075 1,837 1,837      
Provision for loan losses (81) 249 (762)      
Loans charged off 0 0 0      
Recoveries of loans previously charged off 0 0 0      
Ending balance, Allowance 994 2,086 1,075      
Period-end allocation:            
Loans individually evaluated for impairment       176 177 376
Loans collectively evaluated for impairment       818 898 1,710
Ending balance, Allowance 1,075 1,837 1,837 994 1,075 2,086
Loans:            
Individually evaluated for impairment       902 904 3,446
Collectively evaluated for impairment       318,696 327,342 525,653
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       319,598 328,246 529,099
Minimum | Substandard            
Loans:            
Nonaccrual loan       100 100 100
Troubled debt restructuring loans       100 100 100
Commercial, financial and agricultural            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 3,631 2,192 2,192      
Provision for loan losses 783 641 3,019      
Loans charged off (1,449) (104) (2,850)      
Recoveries of loans previously charged off 656 69 1,270      
Ending balance, Allowance 3,621 2,798 3,631      
Period-end allocation:            
Loans individually evaluated for impairment       533 465 626
Loans collectively evaluated for impairment       3,088 3,166 2,172
Ending balance, Allowance 3,631 2,192 2,192 3,621 3,631 2,798
Loans:            
Individually evaluated for impairment       2,147 2,971 1,937
Collectively evaluated for impairment       1,385,290 1,359,537 1,059,662
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       1,387,437 1,362,508 1,061,599
Commercial, financial and agricultural | Purchased Loans            
Loans:            
Nonaccrual loan       796 813  
Real estate – construction and development            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 3,629 2,990 2,990      
Provision for loan losses (171) 640 488      
Loans charged off 0 (53) (95)      
Recoveries of loans previously charged off 114 20 246      
Ending balance, Allowance 3,572 3,597 3,629      
Period-end allocation:            
Loans individually evaluated for impairment       1 48 354
Loans collectively evaluated for impairment       3,571 3,581 3,243
Ending balance, Allowance 3,629 2,990 2,990 3,572 3,629 3,597
Loans:            
Individually evaluated for impairment       126 500 843
Collectively evaluated for impairment       631,378 624,095 414,186
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       631,504 624,595 415,029
Real estate – construction and development | Purchased Loans            
Loans:            
Nonaccrual loan       3,112 3,139  
Real estate – commercial and farmland            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 7,501 7,662 7,662      
Provision for loan losses 689 217 508      
Loans charged off (142) (9) (853)      
Recoveries of loans previously charged off 24 9 184      
Ending balance, Allowance 8,072 7,879 7,501      
Period-end allocation:            
Loans individually evaluated for impairment       1,216 1,047 1,574
Loans collectively evaluated for impairment       6,856 6,454 6,305
Ending balance, Allowance 7,501 7,662 7,662 8,072 7,501 7,879
Loans:            
Individually evaluated for impairment       7,639 8,873 11,260
Collectively evaluated for impairment       1,629,015 1,526,566 1,446,850
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       1,636,654 1,535,439 1,458,110
Real estate – commercial and farmland | Purchased Loans            
Loans:            
Nonaccrual loan       4,347 5,685  
Real estate – residential            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 4,786 6,786 6,786      
Provision for loan losses 177 (791) (86)      
Loans charged off (198) (216) (2,151)      
Recoveries of loans previously charged off 182 61 237      
Ending balance, Allowance 4,947 5,840 4,786      
Period-end allocation:            
Loans individually evaluated for impairment       980 1,028 2,538
Loans collectively evaluated for impairment       3,967 3,758 3,302
Ending balance, Allowance 4,786 6,786 6,786 4,947 4,786 5,840
Loans:            
Individually evaluated for impairment       9,946 10,818 9,630
Collectively evaluated for impairment       1,070,082 998,643 717,165
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       1,080,028 1,009,461 726,795
Real estate – residential | Purchased Loans            
Loans:            
Nonaccrual loan       7,648 5,743  
Consumer installment            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance, Allowance 1,916 827 827      
Provision for loan losses 1,151 174 2,591      
Loans charged off (962) (164) (1,618)      
Recoveries of loans previously charged off 67 17 116      
Ending balance, Allowance 2,172 854 1,916      
Period-end allocation:            
Loans individually evaluated for impairment       0 0 0
Loans collectively evaluated for impairment       2,172 1,916 854
Ending balance, Allowance $ 1,916 $ 827 $ 827 2,172 1,916 854
Loans:            
Individually evaluated for impairment       0 0 0
Collectively evaluated for impairment       316,363 324,511 123,947
Acquired with deteriorated credit quality       0 0 0
Ending balance, Loan       316,363 324,511 $ 123,947
Consumer installment | Purchased Loans            
Loans:            
Nonaccrual loan       $ 37 $ 48