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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Before Tax    
Other comprehensive income (loss), before tax $ (108,361) $ (23,368)
Tax Effect    
Other comprehensive income, tax (28,974) (6,251)
Net of Tax    
Total other comprehensive loss, net of tax (79,387) (17,117)
Net unrealized gains on investment securities    
Before Tax    
Other comprehensive income (loss) before reclassification, before tax (108,448) (23,619)
Other comprehensive income (loss), before tax (108,448) (23,619)
Tax Effect    
Other comprehensive income (loss) before reclassifications, tax (28,998) (6,318)
Other comprehensive income, tax (28,998) (6,318)
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax (79,450) (17,301)
Total other comprehensive loss, net of tax (79,450) (17,301)
Net unrealized losses on derivatives:    
Before Tax    
Other comprehensive income (loss) before reclassification, before tax (50)  
Other comprehensive income (loss), before tax (50)  
Tax Effect    
Other comprehensive income (loss) before reclassifications, tax (13)  
Other comprehensive income, tax (13)  
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax (37)  
Total other comprehensive loss, net of tax (37)  
Amortization of net actuarial loss    
Before Tax    
Reclassification from AOCI, before tax 133 246
Tax Effect    
Reclassification from AOCI, tax 36 66
Net of Tax    
Reclassification from AOCI, net of tax 97 180
Amortization of net transition obligation    
Before Tax    
Reclassification from AOCI, before tax 4 5
Tax Effect    
Reclassification from AOCI, tax 1 1
Net of Tax    
Reclassification from AOCI, net of tax 3 4
Defined benefit plans, net    
Before Tax    
Other comprehensive income (loss), before tax (137) (251)
Tax Effect    
Other comprehensive income, tax (37) (67)
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax 0 0
Reclassification from AOCI, net of tax 100 184
Total other comprehensive loss, net of tax $ 100 $ 184