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LOAN LOSS ALLOWANCE (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Activity in the allowance for loan losses                            
Balance at beginning of year       $ 43,998         $ 43,998          
Provision for loan losses $ 6,141 $ 4,900 $ 4,889 5,095 $ 4,100 $ 4,734 $ 4,522 $ 4,006 21,025 $ 17,362 $ 16,726      
Balance at end of year 51,834       43,998       51,834 43,998        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Total 51,834     43,998 43,998       43,998 43,998   $ 51,834 $ 43,998  
Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       39,229       34,574 39,229 34,574 32,795      
Charged-off loans                 11,524 10,505 11,621      
Recoveries on charged-off loans                 889 792 759      
Provision for loan losses                 17,326 14,368 12,641      
Balance at end of year 45,920       39,229       45,920 39,229 34,574      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       460 714 $ 426
Collectively evaluated                       45,460 38,515 34,148
Total 45,920     39,229 39,229     34,574 39,229 34,574 32,795 45,920 39,229 34,574
Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       4,769       4,734 4,769 4,734 2,867      
Charged-off loans                 3,060 3,521 3,067      
Recoveries on charged-off loans                 506 562 849      
Provision for loan losses                 3,699 2,994 4,085      
Balance at end of year 5,914       4,769       5,914 4,769 4,734      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       111 434 98
Purchased credit-impaired loans                           42
Collectively evaluated                       5,803 4,335 4,594
Total 5,914     4,769 4,769     4,734 4,769 4,734 2,867 5,914 4,769 4,734
Commercial real estate | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       16,498       14,591 16,498 14,591 14,740      
Charged-off loans                 3,875 2,127 6,865      
Recoveries on charged-off loans                 170 243 164      
Provision for loan losses                 4,050 3,791 6,552      
Balance at end of year 16,843       16,498       16,843 16,498 14,591      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       229 158 149
Collectively evaluated                       16,614 16,340 14,442
Total 16,843     16,498 16,498     14,591 16,498 14,591 14,740 16,843 16,498 14,591
Commercial real estate | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       2,303       1,903 2,303 1,903 790      
Charged-off loans                 771 977 681      
Recoveries on charged-off loans                 65 61 418      
Provision for loan losses                 2,259 1,316 1,376      
Balance at end of year 3,856       2,303       3,856 2,303 1,903      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       56 250 43
Purchased credit-impaired loans                           42
Collectively evaluated                       3,800 2,053 1,818
Total 3,856     2,303 2,303     1,903 2,303 1,903 790 3,856 2,303 1,903
Commercial and industrial | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       9,447       7,385 9,447 7,385 5,246      
Charged-off loans                 3,373 4,620 2,358      
Recoveries on charged-off loans                 179 123 169      
Provision for loan losses                 7,597 6,559 4,328      
Balance at end of year 13,850       9,447       13,850 9,447 7,385      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       66 264 21
Collectively evaluated                       13,784 9,183 7,364
Total 13,850     9,447 9,447     7,385 9,447 7,385 5,246 13,850 9,447 7,385
Commercial and industrial | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       1,164       1,330 1,164 1,330 1,093      
Charged-off loans                 844 1,095 752      
Recoveries on charged-off loans                 245 266 289      
Provision for loan losses                 560 663 700      
Balance at end of year 1,125       1,164       1,125 1,164 1,330      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       1 59 0
Purchased credit-impaired loans                           0
Collectively evaluated                       1,124 1,105 1,330
Total 1,125     1,164 1,164     1,330 1,164 1,330 1,093 1,125 1,164 1,330
Residential mortgages | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       7,805       7,613 7,805 7,613 6,864      
Charged-off loans                 806 2,036 1,215      
Recoveries on charged-off loans                 270 159 141      
Provision for loan losses                 2,151 2,069 1,823      
Balance at end of year 9,420       7,805       9,420 7,805 7,613      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       130 136 153
Collectively evaluated                       9,290 7,669 7,460
Total 9,420     7,805 7,805     7,613 7,805 7,613 6,864 9,420 7,805 7,613
Residential mortgages | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       766       976 766 976 615      
Charged-off loans                 797 829 642      
Recoveries on charged-off loans                 43 144 64      
Provision for loan losses                 586 475 939      
Balance at end of year 598       766       598 766 976      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       9 11 30
Purchased credit-impaired loans                           0
Collectively evaluated                       589 755 946
Total 598     766 766     976 766 976 615 598 766 976
Consumer | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       5,479       4,985 5,479 4,985 5,945      
Charged-off loans                 3,470 1,722 1,183      
Recoveries on charged-off loans                 270 267 285      
Provision for loan losses                 3,528 1,949 (62)      
Balance at end of year 5,807       5,479       5,807 5,479 4,985      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       35 156 103
Collectively evaluated                       5,772 5,323 4,882
Total 5,807     5,479 5,479     4,985 5,479 4,985 5,945 5,807 5,479 4,985
Consumer | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       536       525 536 525 369      
Charged-off loans                 648 620 992      
Recoveries on charged-off loans                 153 91 78      
Provision for loan losses                 294 540 1,070      
Balance at end of year 335       536       335 536 525      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       45 114 25
Purchased credit-impaired loans                           0
Collectively evaluated                       290 422 500
Total $ 335     $ 536 $ 536     $ 525 $ 536 $ 525 $ 369 $ 335 $ 536 $ 525