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ACQUISITIONS (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 04, 2017
USD ($)
shares
Nov. 17, 2017
USD ($)
May 12, 2017
USD ($)
Branch
shares
Mar. 01, 2017
USD ($)
Feb. 03, 2017
USD ($)
Jan. 02, 2017
USD ($)
Dec. 04, 2015
USD ($)
Branch
shares
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                          
Cash                     $ 107,414 $ 575 $ (25,505)
Goodwill               $ 734,430     734,430 $ 465,142 $ 463,252
Increase (decrease) in other assets as a result of reclassification and adjustment               (300) $ 5,500 $ (2,700)      
Increase (decrease) in other liabilities as a result of reclassification and adjustment               (20) 6,600 (2,400)      
Increase in investments as a result of updated information not available at the time of acquisition                 200        
Decrease in loans as a result of an adjustment to the valuation of acquired impaired loans               (500) (600)        
Increase in premises and equipment as a result of updated appraisal information not available at the time of acquisition                 3,600        
Gordon B. Roberts Agency, Inc [Member]                          
Business Acquisition [Line Items]                          
Cash $ 1,350                        
Purchase price of acquisition $ 3,700                        
Issuance of common shares (in shares) | shares 40                        
Assets acquired $ 600                        
Other liabilities 700                        
Goodwill 2,200                        
Gordon B. Roberts Agency, Inc [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles $ 1,600                        
Northeast Capital Management, Inc [Member]                          
Business Acquisition [Line Items]                          
Cash   $ 1,200                      
Contingent payment   200                      
Northeast Capital Management, Inc [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles   $ 1,200                      
Dryfoos [Member]                          
Business Acquisition [Line Items]                          
Cash       $ 3,000                  
Goodwill       1,700                  
Dryfoos [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles       $ 1,700                  
BAS [Member]                          
Business Acquisition [Line Items]                          
Cash           $ 1,200              
BAS [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles           $ 1,200              
Merchants Bancshares, Inc. [Member]                          
Business Acquisition [Line Items]                          
Cash [1]     $ 82,898                    
Purchase price of acquisition     $ 345,152                    
Issuance of common shares (in shares) | shares     4,680                    
Assets acquired     $ 2,000,000                    
Other liabilities     11,750                    
Goodwill     189,046                    
Revenue earned                     42,600    
Expenses incurred                     $ 19,900    
Increase (decrease) in goodwill as a result of fair value adjustment               $ 800 (2,000)        
Merchants Bancshares, Inc. [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles     $ 2,857                    
Merchants Bancshares, Inc. [Member] | Vermont [Member]                          
Business Acquisition [Line Items]                          
Number of branch locations added upon merger | Branch     31                    
Merchants Bancshares, Inc. [Member] | Massachusetts [Member]                          
Business Acquisition [Line Items]                          
Number of branch locations added upon merger | Branch     1                    
Oneida Financial Corp [Member]                          
Business Acquisition [Line Items]                          
Cash [1]             $ 56,266            
Purchase price of acquisition             $ 158,468            
Issuance of common shares (in shares) | shares             2,380            
Number of new branch locations included in acquisition or purchase agreement | Branch             12            
Assets acquired             $ 769,400            
Other liabilities             1,333            
Goodwill             89,681            
Oneida Financial Corp [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles             $ 9,994            
Northeast Retirement Services, Inc. [Member]                          
Business Acquisition [Line Items]                          
Cash [1]         $ 70,073                
Purchase price of acquisition         148,556                
Tangible assets, net         $ 36,100                
Factor of straight-line rate of depreciation used in declining balance depreciation method         150.00%                
Period of amortization                     10 years    
Deferred tax liability         $ 24,200                
Other liabilities         28,002                
Goodwill         76,430                
Revenue earned                     $ 31,500    
Expenses incurred                     $ 21,500    
Increase (decrease) in goodwill as a result of fair value adjustment                 $ (100) $ 300      
Northeast Retirement Services, Inc. [Member] | Other Intangibles [Member]                          
Business Acquisition [Line Items]                          
Intangibles         $ 60,200                
[1] Includes NECM $0.2 million contingent cash payment consideration.