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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Beginning balance $ 452,871 $ 558,267 $ 546,733
Total other comprehensive income (loss), net of tax 21,388 (136,024) (28,088)
Ending balance 503,815 452,871 558,267
Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Beginning balance (149,109) (3,666) 26,651
Other comprehensive (loss) income before reclassifications 14,325 (150,141) (30,207)
Amounts reclassified from AOCI 6,862 4,698 (110)
Total other comprehensive income (loss), net of tax 21,187 (145,443) (30,317)
Ending balance (127,922) (149,109) (3,666)
Derivatives      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Beginning balance 4,645 0  
Other comprehensive (loss) income before reclassifications 384 4,645  
Amounts reclassified from AOCI 0 0  
Total other comprehensive income (loss), net of tax 384 4,645  
Ending balance 5,029 4,645 0
Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Beginning balance 480 (4,294) (6,523)
Other comprehensive (loss) income before reclassifications (134) 1,470 1,470
Amounts reclassified from AOCI (49) 3,304 759
Total other comprehensive income (loss), net of tax (183) 4,774 2,229
Ending balance 297 480 (4,294)
AOCI      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Beginning balance (143,984) (7,960) 20,128
Other comprehensive (loss) income before reclassifications 14,575 (144,026) (28,737)
Amounts reclassified from AOCI 6,813 8,002 649
Total other comprehensive income (loss), net of tax 21,388 (136,024) (28,088)
Ending balance $ (122,596) $ (143,984) $ (7,960)