Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
SECURITIES AND OTHER INVESTMENTS (Amortized Cost of HTM Securities by Security Type and Credit Rating) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost $ 860,906 $ 884,216
Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 765,332 784,155
Moody's BBB/BB/B    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,110 1,122
Moody's Not Rated - Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 63,130 64,867
Moody's Not Rated - Non-Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 31,334 34,072
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 774,441 793,162
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 763,759 782,453
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 1,110 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 9,572 9,587
Corporate Bond Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,710 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 1,710 2,255
Collateralized Mortgage-Backed Securities [Member]    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 84,755 88,799
Collateralized Mortgage-Backed Securities [Member] | Moody's AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
HTM Securities, Amortized Cost 1,573 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 63,130 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 $ 20,052 $ 22,230