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LOANS - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance $ 25,101 $ 21,734 $ 23,920 $ 21,062 $ 21,062      
Provision for loan losses 1,787 811 5,828 2,381 4,091      
Loans charged off (2,443) (1,451) (6,829) (4,641) (6,327)      
Recoveries of loans previously charged off 1,521 1,869 3,047 4,161 5,094      
Ending balance, Allowance 25,966 22,963 25,966 22,963 23,920      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           $ 6,395 $ 6,407 $ 5,670
Loans collectively evaluated for impairment           19,571 17,513 17,293
Ending balance, Allowance 25,101 21,734 23,920 21,062 21,062 25,966 23,920 22,963
Loans:                
Individually evaluated for impairment           55,926 60,421 59,839
Collectively evaluated for impairment           5,779,273 5,055,371 4,630,320
Acquired with deteriorated credit quality           121,823 148,534 155,147
Ending balance, Loan           5,957,022 5,264,326 4,845,306
Purchased Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 1,791 1,387 1,626 0 0      
Provision for loan losses 745 (654) 1,428 53 (232)      
Loans charged off (161) (699) (1,472) (1,261) (1,559)      
Recoveries of loans previously charged off 887 1,488 1,680 2,730 3,417      
Ending balance, Allowance 3,262 1,522 3,262 1,522 1,626      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           3,262 1,626 1,522
Loans collectively evaluated for impairment           0 0 0
Ending balance, Allowance 1,791 1,387 1,626 0 0 3,262 1,626 1,522
Loans:                
Individually evaluated for impairment           32,032 34,141 34,991
Collectively evaluated for impairment           763,271 886,516 939,243
Acquired with deteriorated credit quality           121,823 148,534 155,147
Ending balance, Loan           917,126 1,069,191 1,129,381
Nonaccrual loan           19,049 22,966 23,827
Troubled debt restructuring loans           20,205 23,543 21,117
Purchased Loan Pools                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 1,623 1,199 1,837 581 581      
Provision for loan losses (146) 809 (360) 1,427 1,256      
Loans charged off 0 0 0 0 0      
Recoveries of loans previously charged off 0 0 0 0 0      
Ending balance, Allowance 1,477 2,008 1,477 2,008 1,837      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           105 0 0
Loans collectively evaluated for impairment           1,372 1,837 2,008
Ending balance, Allowance 1,623 1,199 1,837 581 581 1,477 1,837 2,008
Loans:                
Individually evaluated for impairment           915 0 0
Collectively evaluated for impairment           464,303 568,314 624,886
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           465,218 568,314 624,886
Commercial, financial and agricultural                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 3,302 1,667 2,192 1,144 1,144      
Provision for loan losses 910 677 2,535 1,987 2,647      
Loans charged off (1,091) (326) (1,896) (1,273) (1,999)      
Recoveries of loans previously charged off 409 119 699 279 400      
Ending balance, Allowance 3,530 2,137 3,530 2,137 2,192      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           509 120 107
Loans collectively evaluated for impairment           3,021 2,072 2,030
Ending balance, Allowance 3,302 1,667 2,192 1,144 1,144 3,530 2,192 2,137
Loans:                
Individually evaluated for impairment           3,204 501 424
Collectively evaluated for impairment           1,304,005 966,637 625,523
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           1,307,209 967,138 625,947
Commercial, financial and agricultural | Purchased Loans                
Loans:                
Nonaccrual loan           2,086 692  
Real estate – construction and development                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 3,756 3,599 2,990 5,009 5,009      
Provision for loan losses (587) (521) 155 (2,010) (1,921)      
Loans charged off (1) (60) (95) (324) (588)      
Recoveries of loans previously charged off 126 131 244 474 490      
Ending balance, Allowance 3,294 3,149 3,294 3,149 2,990      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           81 266 529
Loans collectively evaluated for impairment           3,213 2,724 2,620
Ending balance, Allowance 3,756 3,599 2,990 5,009 5,009 3,294 2,990 3,149
Loans:                
Individually evaluated for impairment           627 659 1,154
Collectively evaluated for impairment           549,562 362,386 327,154
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           550,189 363,045 328,308
Real estate – construction and development | Purchased Loans                
Loans:                
Nonaccrual loan           3,255 2,611  
Real estate – commercial and farmland                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 7,869 7,459 7,662 7,994 7,994      
Provision for loan losses 68 (554) 540 (559) 107      
Loans charged off (18) 0 (413) (708) (708)      
Recoveries of loans previously charged off 26 13 156 191 269      
Ending balance, Allowance 7,945 6,918 7,945 6,918 7,662      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           1,380 1,502 883
Loans collectively evaluated for impairment           6,565 6,160 6,035
Ending balance, Allowance 7,869 7,459 7,662 7,994 7,994 7,945 7,662 6,918
Loans:                
Individually evaluated for impairment           10,512 12,423 11,699
Collectively evaluated for impairment           1,548,370 1,393,796 1,285,883
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           1,558,882 1,406,219 1,297,582
Real estate – commercial and farmland | Purchased Loans                
Loans:                
Nonaccrual loan           6,974 10,174  
Real estate – residential                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 5,605 4,263 6,786 4,760 4,760      
Provision for loan losses 127 2,649 (9) 2,415 2,757      
Loans charged off (852) (292) (2,031) (883) (1,122)      
Recoveries of loans previously charged off 56 40 190 368 391      
Ending balance, Allowance 4,936 6,660 4,936 6,660 6,786      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           1,058 2,893 2,629
Loans collectively evaluated for impairment           3,878 3,893 4,031
Ending balance, Allowance 5,605 4,263 6,786 4,760 4,760 4,936 6,786 6,660
Loans:                
Individually evaluated for impairment           8,636 12,697 11,571
Collectively evaluated for impairment           960,653 768,321 755,362
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           969,289 781,018 766,933
Real estate – residential | Purchased Loans                
Loans:                
Nonaccrual loan           6,646 9,476  
Consumer Installment And Other                
Allowance for Loan and Lease Losses [Roll Forward]                
Beginning balance, Allowance 1,155 2,160 827 1,574 1,574      
Provision for loan losses 670 (1,595) 1,539 (932) (523)      
Loans charged off (320) (74) (922) (192) (351)      
Recoveries of loans previously charged off 17 78 78 119 127      
Ending balance, Allowance 1,522 569 1,522 569 827      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                
Loans individually evaluated for impairment           0 0 0
Loans collectively evaluated for impairment           1,522 827 569
Ending balance, Allowance $ 1,155 $ 2,160 $ 827 $ 1,574 $ 1,574 1,522 827 569
Loans:                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           189,109 109,401 72,269
Acquired with deteriorated credit quality           0 0 0
Ending balance, Loan           189,109 109,401 72,269
Minimum | Substandard                
Loans:                
Nonaccrual loan           100 100 100
Troubled debt restructuring loans           $ 100 $ 100 $ 100