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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Changes in each component of AOCI, net of tax                
Beginning balance $ 518,647 $ 507,203 $ 503,815 $ 476,279 $ 470,926 $ 452,871 $ 503,815 $ 452,871
Other comprehensive income 18,177 1,632 (1,727) (14,272) (2,547) 11,256 18,082 (5,563)
Ending balance 543,725 518,647 507,203 468,598 476,279 470,926 543,725 468,598
Investment Securities                
Changes in each component of AOCI, net of tax                
Beginning balance (130,248)   (127,922) (141,252)   (149,109) (127,922) (149,109)
Other comprehensive income (loss) before reclassifications 19,942     (18,160)     15,036 (12,979)
Reclassification adjustments from AOCI 1,413     1,587     3,993 4,263
Other comprehensive income 21,355     (16,573)     19,029 (8,716)
Ending balance (108,893) (130,248)   (157,825) (141,252)   (108,893) (157,825)
Derivatives                
Changes in each component of AOCI, net of tax                
Beginning balance 7,260   5,029 5,522   4,645 5,029 4,645
Other comprehensive income (loss) before reclassifications (3,177)     2,313     (946) (3,190)
Reclassification adjustments from AOCI 0     0     0 0
Other comprehensive income (3,177)     2,313     (946) 3,190
Ending balance 4,083 7,260   7,835 5,522   4,083 7,835
SERP                
Changes in each component of AOCI, net of tax                
Beginning balance 297   297 455   480 297 480
Other comprehensive income (loss) before reclassifications 0     0     0 0
Reclassification adjustments from AOCI (1)     (12)     (1) (37)
Other comprehensive income (1)     (12)     (1) (37)
Ending balance 296 297   443 455   296 443
Accum. Other Comp. Loss                
Changes in each component of AOCI, net of tax                
Beginning balance (122,691) (124,323) (122,596) (135,275) (132,728) (143,984) (122,596) (143,984)
Other comprehensive income (loss) before reclassifications 16,765     (15,847)     14,090 (9,789)
Reclassification adjustments from AOCI 1,412     1,575     3,992 4,226
Other comprehensive income 18,177 1,632 (1,727) (14,272) (2,547) 11,256 18,082 (5,563)
Ending balance $ (104,514) $ (122,691) $ (124,323) $ (149,547) $ (135,275) $ (132,728) $ (104,514) $ (149,547)