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ACQUISITIONS (Summary of Loans Acquired in Accordance with ASC 310-30) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 04, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Interest component of expected cash flows (accretable difference) $ (225) $ (539)   $ 0
Community Bank of Bergen County Merger        
Business Acquisition [Line Items]        
Fair value of acquired loans     $ 236,010  
Community Bank of Bergen County Merger | Loans acquired with credit deterioration        
Business Acquisition [Line Items]        
Contractually required principal and interest at acquisition     6,289  
Contractual cash flows not expected to be collected (non-accretable difference)     1,819  
Expected cash flows at acquisition     4,470  
Interest component of expected cash flows (accretable difference)     846  
Fair value of acquired loans     $ 3,624