Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Amortized Cost of HTM Securities by Security Type and Credit Rating) (Details)

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SECURITIES (Amortized Cost of HTM Securities by Security Type and Credit Rating) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
HTM Securities, Amortized Cost $ 535,722 $ 544,851
Moody's AAA/AA/A    
HTM Securities, Amortized Cost 528,157 532,157
Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 7,565 8,084
Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost   4,610
U.S. government and agency securities    
HTM Securities, Amortized Cost 2,637 2,751
U.S. government and agency securities | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 0 0
U.S. government and agency securities | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 2,637 2,751
U.S. government and agency securities | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 0 0
Obligations of states and political subdivisions    
HTM Securities, Amortized Cost 528,157 536,767
Obligations of states and political subdivisions | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 528,157 532,157
Obligations of states and political subdivisions | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 0 0
Obligations of states and political subdivisions | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 0 4,610
Mortgage-backed securities    
HTM Securities, Amortized Cost 4,928 5,333
Mortgage-backed securities | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 0 0
Mortgage-backed securities | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 4,928 5,333
Mortgage-backed securities | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost $ 0 $ 0