v3.26.3
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Changes in each component of AOCI, net of tax        
Beginning balance $ 596,331 $ 568,874 $ 592,581 $ 538,385
Other comprehensive loss (19,459) 9,602 (20,547) 22,366
Ending balance 581,437 588,066 581,437 588,066
Investment Securities        
Changes in each component of AOCI, net of tax        
Beginning balance (92,809) (106,060) (90,894) (121,491)
Other comprehensive (loss) income before reclassifications (22,016) 8,670 (26,315) 21,653
Reclassification adjustments from AOCI 1,293 1,361 3,677 3,809
Other comprehensive loss (20,723) 10,031 (22,638) 25,462
Ending balance (113,532) (96,029) (113,532) (96,029)
Derivatives        
Changes in each component of AOCI, net of tax        
Beginning balance 4,066 3,827 3,240 6,494
Other comprehensive (loss) income before reclassifications 1,263 (429) 2,089 3,096
Reclassification adjustments from AOCI 0 0 0 0
Other comprehensive loss 1,263 (429) 2,089 (3,096)
Ending balance 5,329 3,398 5,329 3,398
SERP        
Changes in each component of AOCI, net of tax        
Beginning balance 387 575 386 575
Other comprehensive (loss) income before reclassifications 0 0 0 0
Reclassification adjustments from AOCI 1 0 2 0
Other comprehensive loss 1 0 2 0
Ending balance 388 575 388 575
Accum. Other Comp. Loss        
Changes in each component of AOCI, net of tax        
Beginning balance (88,356) (101,658) (87,268) (114,422)
Other comprehensive (loss) income before reclassifications (20,753) 8,241 (24,226) 18,557
Reclassification adjustments from AOCI 1,294 1,361 3,679 3,809
Other comprehensive loss (19,459) 9,602 (20,547) 22,366
Ending balance $ (107,815) $ (92,056) $ (107,815) $ (92,056)