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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in each component of AOCI, net of tax    
Balance at beginning of period $ 558,219  
Total other comprehensive loss, net of tax (79,387) $ (17,117)
Balance at end of period 486,328  
Investment Securities    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (3,666) 26,651
Other comprehensive income (loss) before reclassifications (79,450) (17,301)
Reclassification adjustments from AOCI 0 0
Total other comprehensive loss, net of tax (79,450) (17,301)
Balance at end of period (83,116) 9,350
Derivatives    
Changes in each component of AOCI, net of tax    
Balance at beginning of period 0 0
Other comprehensive income (loss) before reclassifications (37) 0
Reclassification adjustments from AOCI 0 0
Total other comprehensive loss, net of tax (37) 0
Balance at end of period (37) 0
Defined Benefit Plans    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (4,294) (6,523)
Other comprehensive income (loss) before reclassifications 0 0
Reclassification adjustments from AOCI 100 184
Total other comprehensive loss, net of tax 100 184
Balance at end of period (4,194) (6,339)
Accum. Other Comp. Loss    
Changes in each component of AOCI, net of tax    
Balance at beginning of period (7,960) 20,128
Other comprehensive income (loss) before reclassifications (79,487) (17,301)
Reclassification adjustments from AOCI 100 184
Total other comprehensive loss, net of tax (79,387) (17,117)
Balance at end of period $ (87,347) $ 3,011