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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Before and After Tax Amounts by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Change in unrealized gain (loss) on securities:            
Change in net unrealized gain during the period $ 3,306   $ 3,775   $ 11,266 $ 7,119
Reclassification adjustment for net losses included in net loss on sale of securities and other assets (149)       (149)  
Accretion of net unrealized loss on securities transferred to held-to-maturity 759   818   1,483 1,536
Credit loss expense 907       1,800  
Net change 4,823   4,593   14,400 8,655
Tax expense 1,480   1,634   4,419 2,846
Net change in unrealized gain on securities, net of reclassification adjustments and tax 3,343   2,959   9,981 5,809
Change in pension and other postretirement obligations:            
Reclassification adjustment for expense included in other expense 128   (318)   41 (635)
Change in the net actuarial gain 104   520   4,958 1,040
Net change 232   202   4,999 405
Tax expense 71   77   1,534 135
Net change in pension and other postretirement obligations 161   125   3,465 270
Change in unrealized gain (loss) on derivatives:            
Change in net unrealized (loss) gain during the period (5,407)   (3,128)   (12,974) (983)
Reclassification adjustment for expense included in interest expense 1,950   2,520   3,790 4,955
Net change (3,457)   (608)   (9,184) 3,972
Tax (benefit) expense (1,061)   (210)   (2,819) 1,252
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax (2,396)   (398)   (6,365) 2,720
Total other comprehensive income, net of tax $ 1,108 $ 5,973 $ 2,686 $ 6,113 $ 7,081 $ 8,799