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MERGERS AND ACQUISITIONS - Information About Acquired PCI Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]          
Nonaccretable difference   $ (139) $ (825) $ (1,260) $ (1,441)
Hamilton Bancorp, Inc.          
Business Acquisition [Line Items]          
Contractually required principal and interest at acquisition $ 31,599        
Nonaccretable difference (8,834)        
Expected cash flows at acquisition 22,765        
Accretable yield (3,497)        
Estimated fair value of acquired PCI loans $ 19,268