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, 2026
Dec. 31, 2025
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost $ 870,288 $ 884,216
Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 772,384 784,155
Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,116 1,122
Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 64,040 64,867
Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 32,748 34,072
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 781,389 793,162
US States and Political Subdivisions Debt Securities [Member] | Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 770,694 782,453
US States and Political Subdivisions Debt Securities [Member] | Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,116 1,122
US States and Political Subdivisions Debt Securities [Member] | Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 0 0
US States and Political Subdivisions Debt Securities [Member] | Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 9,579 9,587
Corporate Bond Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 2,124 2,255
Corporate Bond Securities [Member] | Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 0 0
Corporate Bond Securities [Member] | Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 2,124 2,255
Collateralized Mortgage-Backed Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 86,775 88,799
Collateralized Mortgage-Backed Securities [Member] | Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,690 1,702
Collateralized Mortgage-Backed Securities [Member] | Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 0 0
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 64,040 64,867
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost $ 21,045 $ 22,230