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
Jun. 30, 2024
Dec. 31, 2023
HTM Securities, Amortized Cost $ 810,450 $ 837,378
Moody's AAA/AA/A    
HTM Securities, Amortized Cost 692,405 698,219
Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,155 1,166
Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 66,823 68,039
Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 50,067 69,954
US States and Political Subdivisions Debt Securities [Member]    
HTM Securities, Amortized Cost 694,772 699,189
US States and Political Subdivisions Debt Securities [Member] | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 684,104 688,499
US States and Political Subdivisions Debt Securities [Member] | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,155 1,166
US States and Political Subdivisions Debt Securities [Member] | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 0 0
US States and Political Subdivisions Debt Securities [Member] | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 9,513 9,524
Corporate Bond Securities [Member]    
HTM Securities, Amortized Cost 3,804 4,349
Corporate Bond Securities [Member] | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 3,804 4,349
Collateralized Mortgage-Backed Securities [Member]    
HTM Securities, Amortized Cost 111,874 133,840
Collateralized Mortgage-Backed Securities [Member] | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 8,301 9,720
Collateralized Mortgage-Backed Securities [Member] | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 0 0
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 66,823 68,039
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost $ 36,750 $ 56,081