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MERGERS AND ACQUISITIONS - Information About Acquired PCI Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Business Acquisition [Line Items]      
Nonaccretable difference   $ (617) $ (617)
Hamilton Bancorp, Inc.      
Business Acquisition [Line Items]      
Contractually required principal and interest at acquisition $ 31,599    
Nonaccretable difference (8,310)    
Expected cash flows at acquisition 23,289    
Accretable yield (3,497)    
Estimated fair value of acquired PCI loans $ 19,792