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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period $ 558,219    
Total other comprehensive (loss) income, net of tax (136,024) $ (28,088) $ 11,719
Balance at the end of the period 452,871 558,219  
Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (3,666) 26,651 14,825
Other comprehensive (loss) income before reclassifications (150,141) (30,207) 11,679
Amounts reclassified from AOCI 4,698 (110) 147
Total other comprehensive (loss) income, net of tax (145,443) (30,317) 11,826
Balance at the end of the period (149,109) (3,666) 26,651
Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (4,294) (6,523) (6,416)
Other comprehensive (loss) income before reclassifications 1,470 1,470 (980)
Amounts reclassified from AOCI 3,304 759 873
Total other comprehensive (loss) income, net of tax 4,774 2,229 (107)
Balance at the end of the period 480 (4,294) (6,523)
AOCI      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (7,960) 20,128 8,409
Other comprehensive (loss) income before reclassifications (144,026) (28,737) 10,699
Amounts reclassified from AOCI 8,002 649 1,020
Total other comprehensive (loss) income, net of tax (136,024) (28,088) 11,719
Balance at the end of the period (143,984) (7,960) $ 20,128
Derivatives      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period 0    
Other comprehensive (loss) income before reclassifications 4,645    
Amounts reclassified from AOCI 0    
Total other comprehensive (loss) income, net of tax 4,645    
Balance at the end of the period $ 4,645 $ 0