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LOAN LOSS ALLOWANCE (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Activity in the allowance for loan losses                            
Balance at beginning of year       $ 61,469         $ 61,469          
Provision for loan losses $ 5,351 $ 22,600 $ 3,467 4,001 $ 6,716 $ 6,628 $ 6,532 $ 5,575 35,419 $ 25,451 $ 21,025      
Balance at end of year 63,575       61,469       63,575 61,469        
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Total 63,575     61,469 61,469       61,469 61,469   $ 63,575 $ 61,469  
Business Activities Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       56,139       45,920 56,139 45,920 39,229      
Charged-off loans                 34,333 13,478 11,524      
Recoveries on charged-off loans                 1,892 1,147 889      
Provision for loan losses                 33,478 22,550 17,326      
Balance at end of year 57,176       56,139       57,176 56,139 45,920      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       294 197 $ 460
Collectively evaluated                       56,882 55,942 45,460
Total 57,176     56,139 56,139     45,920 56,139 45,920 45,920 57,176 56,139 45,920
Business Activities Loans | Commercial real estate                            
Activity in the allowance for loan losses                            
Balance at beginning of year       21,732       16,843 21,732 16,843 16,498      
Charged-off loans                 6,577 5,859 3,875      
Recoveries on charged-off loans                 570 50 170      
Provision for loan losses                 9,033 10,698 4,050      
Balance at end of year 24,758       21,732       24,758 21,732 16,843      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       20 9 229
Collectively evaluated                       24,738 21,723 16,614
Total 24,758     21,732 21,732     16,843 21,732 16,843 16,843 24,758 21,732 16,843
Business Activities Loans | Commercial and industrial                            
Activity in the allowance for loan losses                            
Balance at beginning of year       16,504       13,850 16,504 13,850 9,447      
Charged-off loans                 23,799 4,275 3,373      
Recoveries on charged-off loans                 1,012 620 179      
Provision for loan losses                 25,404 6,309 7,597      
Balance at end of year 19,121       16,504       19,121 16,504 13,850      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       122 49 66
Collectively evaluated                       18,999 16,455 13,784
Total 19,121     16,504 16,504     13,850 16,504 16,504 9,447 19,121 16,504 13,850
Business Activities Loans | Residential mortgages                            
Activity in the allowance for loan losses                            
Balance at beginning of year       10,535       9,420 10,535 9,420 7,805      
Charged-off loans                 635 157 806      
Recoveries on charged-off loans                 57 114 270      
Provision for loan losses                 (1,417) 1,158 2,151      
Balance at end of year 8,540       10,535       8,540 10,535 9,420      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       109 128 130
Collectively evaluated                       8,431 10,407 9,290
Total 8,540     10,535 10,535     9,420 8,540 9,420 9,420 8,540 10,535 9,420
Business Activities Loans | Consumer                            
Activity in the allowance for loan losses                            
Balance at beginning of year       7,368       5,807 7,368 5,807 5,479      
Charged-off loans                 3,322 3,187 3,470      
Recoveries on charged-off loans                 253 363 270      
Provision for loan losses                 458 4,385 3,528      
Balance at end of year 4,757       7,368       4,757 7,368 5,807      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       43 11 35
Collectively evaluated                       4,714 7,357 5,772
Total 4,757     7,368 7,368     5,807 7,368 5,807 5,807 4,757 7,368 5,807
Acquired Loans                            
Activity in the allowance for loan losses                            
Balance at beginning of year       5,330       5,914 5,330 5,914 4,769      
Charged-off loans                 2,221 4,533 3,060      
Recoveries on charged-off loans                 1,349 1,048 506      
Provision for loan losses                 1,941 2,901 3,699      
Balance at end of year 6,399       5,330       6,399 5,330 5,914      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       118 97 111
Collectively evaluated                       6,281 5,233 5,803
Total 6,399     5,330 5,330     5,914 5,330 5,914 5,914 6,399 5,330 5,914
Acquired Loans | Commercial real estate                            
Activity in the allowance for loan losses                            
Balance at beginning of year       3,153       3,856 3,153 3,856 2,303      
Charged-off loans                 830 1,812 771      
Recoveries on charged-off loans                 672 294 65      
Provision for loan losses                 1,111 815 2,259      
Balance at end of year 4,106       3,153       4,106 3,153 3,856      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       97 9 56
Collectively evaluated                       4,009 3,144 3,800
Total 4,106     3,153 3,153     3,856 3,153 3,856 3,856 4,106 3,153 3,856
Acquired Loans | Commercial and industrial                            
Activity in the allowance for loan losses                            
Balance at beginning of year       1,064       1,125 1,064 1,125 1,164      
Charged-off loans                 571 524 844      
Recoveries on charged-off loans                 438 286 245      
Provision for loan losses                 126 177 560      
Balance at end of year 1,057       1,064       1,057 1,064 1,125      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       1 4 1
Collectively evaluated                       1,056 1,060 1,124
Total 1,057     1,064 1,064     1,125 1,064 1,125 1,125 1,057 1,064 1,125
Acquired Loans | Residential mortgages                            
Activity in the allowance for loan losses                            
Balance at beginning of year       630       598 630 598 766      
Charged-off loans                 263 1,091 797      
Recoveries on charged-off loans                 116 51 43      
Provision for loan losses                 365 1,072 586      
Balance at end of year 848       630       848 630 598      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       8 36 9
Collectively evaluated                       840 594 589
Total 848     630 630     598 630 598 598 848 630 598
Acquired Loans | Consumer                            
Activity in the allowance for loan losses                            
Balance at beginning of year       483       335 483 335 536      
Charged-off loans                 557 1,106 648      
Recoveries on charged-off loans                 123 417 153      
Provision for loan losses                 339 837 294      
Balance at end of year 388       483       388 483 335      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                            
Individually evaluated for impairment                       12 48 45
Collectively evaluated                       376 435 290
Total $ 388     $ 483 $ 483     $ 335 $ 483 $ 335 $ 335 $ 388 $ 483 $ 335