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ACQUISITIONS, Acquisitions of Oneida, EBS-RMSCO and B of A (Details)
shares in Thousands, $ in Thousands
Dec. 04, 2015
USD ($)
Branch
shares
Jan. 02, 2014
USD ($)
Dec. 13, 2013
USD ($)
Branch
EBS-RMSCO, Inc. [Member]      
Business Acquisition [Line Items]      
Deposits acquired   $ 0  
Bank of America Agreement [Member]      
Business Acquisition [Line Items]      
Number of new branch locations included in acquisition or purchase agreement | Branch     8
Deposits acquired     $ 303,456
Blended deposit premium     2.40%
Total deposit premium paid     $ 7,300
Bank of America Agreement [Member] | Core Deposits [Member]      
Business Acquisition [Line Items]      
Deposits acquired     220,000
Bank of America Agreement [Member] | Time Deposits [Member]      
Business Acquisition [Line Items]      
Deposits acquired     $ 83,000
Oneida Financial Corp [Member]      
Business Acquisition [Line Items]      
Cash/Total net consideration paid $ 158,000    
Issuance of common shares (in shares) | shares 2,780    
Number of new branch locations included in acquisition or purchase agreement | Branch 12    
Assets acquired $ 769,000    
Deposits acquired $ 699,241