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MERGERS AND ACQUISITIONS AND BRANCH CONSOLIDATIONS - Information About Acquired PCI Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Contractual cash flows not expected to be collected (nonaccretable discount)   $ (2,444) $ 0
Hamilton Bancorp, Inc.      
Business Acquisition [Line Items]      
Contractually required principal and interest at acquisition $ 31,599    
Contractual cash flows not expected to be collected (nonaccretable discount) (8,616)    
Expected cash flows at acquisition 22,983    
Interest component of expected cash flows (accretable discount) (3,497)    
Estimated Fair value of acquired PCI loans $ 19,486