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LOAN LOSS ALLOWANCE (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Activity in the allowance for loan losses                            
Balance at beginning of year       $ 39,308         $ 39,308          
Provision for loan losses $ 4,100 $ 4,734 $ 4,522 4,006 $ 4,431 $ 4,240 $ 4,204 $ 3,851 17,362 $ 16,726 $ 14,968      
Balance at end of year 43,998       39,308       43,998 39,308        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Total 43,998     39,308 39,308       39,308 39,308   $ 43,998 $ 39,308  
Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       34,574       32,795 34,574 32,795 29,527      
Charged-off loans                 10,505 11,621 9,470      
Recoveries on charged-off loans                 792 759 673      
Provision for loan losses                 14,368 12,641 12,065      
Balance at end of year 39,229       34,574       39,229 34,574 32,795      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       714 426 $ 1,143
Collectively evaluated                       38,515 34,148 31,652
Total 39,229     34,574 34,574     32,795 34,574 32,795 29,527 39,229 34,574 32,795
Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       4,734       2,867 4,734 2,867 3,796      
Charged-off loans                 3,521 3,067 4,383      
Recoveries on charged-off loans                 562 849 551      
Provision for loan losses                 2,994 4,085 2,903      
Balance at end of year 4,769       4,734       4,769 4,734 2,867      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       432 98 171
Purchased credit-impaired loans                       0 42 0
Collectively evaluated                       4,337 4,594 2,696
Total 4,769     4,734 4,734     2,867 4,734 2,867 3,796 4,769 4,734 2,867
Commercial real estate | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       14,508       14,690 14,508 14,690 13,705      
Charged-off loans                 2,127 6,865 4,207      
Recoveries on charged-off loans                 243 164 9      
Provision for loan losses                 3,781 6,519 5,183      
Balance at end of year 16,405       14,508       16,405 14,508 14,690      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       158 149 922
Collectively evaluated                       16,247 14,359 13,768
Total 16,405     14,508 14,508     14,690 14,508 14,690 13,705 16,405 14,508 14,690
Commercial real estate | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       1,903       790 1,903 790 2,339      
Charged-off loans                 977 681 1,477      
Recoveries on charged-off loans                 61 418 261      
Provision for loan losses                 1,316 1,376 (333)      
Balance at end of year 2,303       1,903       2,303 1,903 790      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       250 43 48
Purchased credit-impaired loans                       0 42 0
Collectively evaluated                       2,053 1,818 742
Total 2,303     1,903 1,903     790 1,903 790 2,339 2,303 1,903 790
Commercial and industrial | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       7,317       5,206 7,317 5,206 5,173      
Charged-off loans                 4,620 2,358 2,500      
Recoveries on charged-off loans                 123 169 193      
Provision for loan losses                 6,551 4,300 2,340      
Balance at end of year 9,371       7,317       9,371 7,317 5,206      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       264 21 0
Collectively evaluated                       9,107 7,296 5,206
Total 9,371     7,317 7,317     5,206 7,317 5,206 5,173 9,371 7,317 5,206
Commercial and industrial | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       1,330       1,093 1,330 1,093 597      
Charged-off loans                 1,095 752 510      
Recoveries on charged-off loans                 266 289 35      
Provision for loan losses                 663 700 971      
Balance at end of year 1,164       1,330       1,164 1,330 1,093      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       60 0 0
Purchased credit-impaired loans                       0 0 0
Collectively evaluated                       1,104 1,330 1,093
Total 1,164     1,330 1,330     1,093 1,330 1,093 597 1,164 1,330 1,093
Residential mortgages | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       7,566       6,836 7,566 6,836 6,937      
Charged-off loans                 2,036 1,215 1,455      
Recoveries on charged-off loans                 159 141 186      
Provision for loan losses                 2,063 1,804 1,168      
Balance at end of year 7,752       7,566       7,752 7,566 6,836      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       136 153 155
Collectively evaluated                       7,616 7,413 6,681
Total 7,752     7,566 7,566     6,836 7,566 6,836 6,937 7,752 7,566 6,836
Residential mortgages | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       976       615 976 615 625      
Charged-off loans                 829 642 1,141      
Recoveries on charged-off loans                 144 64 179      
Provision for loan losses                 475 939 952      
Balance at end of year 766       976       766 976 615      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       11 30 48
Purchased credit-impaired loans                       0 0 0
Collectively evaluated                       755 946 567
Total 766     976 976     615 976 615 625 766 976 615
Consumer | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       4,956       5,928 4,956 5,928 3,644      
Charged-off loans                 1,722 1,183 1,308      
Recoveries on charged-off loans                 267 285 285      
Provision for loan losses                 1,946 (74) 3,307      
Balance at end of year 5,447       4,956       5,447 4,956 5,928      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       156 103 66
Collectively evaluated                       5,291 4,853 5,862
Total 5,447     4,956 4,956     5,928 4,956 5,928 3,644 5,447 4,956 5,928
Consumer | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       525       369 525 369 235      
Charged-off loans                 620 992 1,255      
Recoveries on charged-off loans                 91 78 76      
Provision for loan losses                 540 1,070 1,313      
Balance at end of year 536       525       536 525 369      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       111 25 75
Purchased credit-impaired loans                       0 0 0
Collectively evaluated                       425 500 294
Total 536     525 525     369 525 369 235 536 525 369
Unallocated | Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       227       135 227 135 68      
Charged-off loans                 0 0 0      
Recoveries on charged-off loans                 0 0 0      
Provision for loan losses                 27 92 67      
Balance at end of year 254       227       254 227 135      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       0 0 0
Collectively evaluated                       254 227 135
Total 254     227 227     135 227 135 68 254 227 135
Unallocated | Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       0       0 0 0 0      
Charged-off loans                 0 0 0      
Recoveries on charged-off loans                 0 0 0      
Provision for loan losses                 0 0 0      
Balance at end of year 0       0       0 0 0      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       0 0 0
Purchased credit-impaired loans                       0 0 0
Collectively evaluated                       0 0 0
Total $ 0     $ 0 $ 0     $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0