Quarterly report [Sections 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, 2025
Dec. 31, 2024
HTM Securities, Amortized Cost $ 821,059 $ 803,851
Moody's AAA/AA/A    
HTM Securities, Amortized Cost 715,557 692,671
Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,139 1,144
Moody's Not Rated - Agency    
HTM Securities, Amortized Cost 64,044 64,595
Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost 40,319 45,441
US States and Political Subdivisions Debt Securities [Member]    
HTM Securities, Amortized Cost 720,888 697,683
US States and Political Subdivisions Debt Securities [Member] | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 710,141 686,923
US States and Political Subdivisions Debt Securities [Member] | Moody's BBB/BB/B    
HTM Securities, Amortized Cost 1,139 1,144
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 9,608 9,616
Corporate Bond Securities [Member]    
HTM Securities, Amortized Cost 3,087 3,322
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 3,087 3,322
Collateralized Mortgage-Backed Securities [Member]    
HTM Securities, Amortized Cost 97,084 102,846
Collateralized Mortgage-Backed Securities [Member] | Moody's AAA/AA/A    
HTM Securities, Amortized Cost 5,416 5,748
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 64,044 64,595
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Non-Agency    
HTM Securities, Amortized Cost $ 27,624 $ 32,503