Quarterly report pursuant to Section 13 or 15(d)

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

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SECURITIES AND OTHER INVESTMENTS (Amortized Cost of HTM Securities by Security Type and Credit Rating) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
HTM Securities, Amortized Cost $ 828,928 $ 837,378
Moody's AAA/AA/A    
HTM Securities, Amortized Cost 694,459 698,219
Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,160 1,166
Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 67,305 68,039
Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 66,004 69,954
Obligations of states and political subdivisions    
HTM Securities, Amortized Cost 695,952 699,189
Obligations of states and political subdivisions | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 685,273 688,499
Obligations of states and political subdivisions | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,160 1,166
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 9,519 9,524
Corporate and other bonds    
HTM Securities, Amortized Cost 4,230 4,349
Corporate and other bonds | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 0 0
Corporate and other bonds | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 0 0
Corporate and other bonds | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 0 0
Corporate and other bonds | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 4,230 4,349
Mortgage-backed securities    
HTM Securities, Amortized Cost 128,746 133,840
Mortgage-backed securities | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 9,186 9,720
Mortgage-backed securities | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 0 0
Mortgage-backed securities | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 67,305 68,039
Mortgage-backed securities | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost $ 52,255 $ 56,081