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
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost $ 883,786 $ 803,851
Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 779,716 692,671
Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,127 1,144
Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 65,630 64,595
Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 37,313 45,441
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 788,643 697,683
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 777,922 686,923
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 1,127 1,144
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 9,594 9,616
Corporate Bond Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 2,515 3,322
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 2,515 3,322
Collateralized Mortgage-Backed Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 92,628 102,846
Collateralized Mortgage-Backed Securities [Member] | Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,794 5,748
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 65,630 64,595
Collateralized Mortgage-Backed Securities [Member] | Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost $ 25,204 $ 32,503