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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 15 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Before Tax      
Amortization $ (1,668) $ 0  
Other comprehensive income (loss), before tax 15,310 (108,361)  
Tax Effect      
Other comprehensive income, tax 4,054 (28,974)  
Net of Tax      
Other comprehensive income 11,256 (79,387)  
Net unrealized gains on investment securities      
Before Tax      
Other comprehensive income (loss) before reclassification, before tax 15,258 (108,448)  
Amortization 1,668   $ 7,900
Other comprehensive income (loss), before tax 16,926 (108,448)  
Tax Effect      
Other comprehensive income (loss) before reclassifications, tax 4,052 (28,998)  
Less: Amortization of unrealized losses on investment securities transferred to HTM 443    
Other comprehensive income, tax 4,495 (28,998)  
Net of Tax      
Other comprehensive income (loss), before reclassifications, net of tax 11,206 (79,450)  
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,225    
Other comprehensive income 12,431 (79,450)  
Net change in fair value of derivatives:      
Before Tax      
Other comprehensive income (loss) before reclassification, before tax (1,599) (50)  
Other comprehensive income (loss), before tax (1,599) (50)  
Tax Effect      
Other comprehensive income (loss) before reclassifications, tax (436) (13)  
Other comprehensive income, tax (436) (13)  
Net of Tax      
Other comprehensive income (loss), before reclassifications, net of tax (1,163) (37)  
Other comprehensive income (1,163) (37)  
Amortization of net actuarial loss      
Before Tax      
Reclassification from AOCI, before tax (19) 133  
Tax Effect      
Reclassification from AOCI, tax (5) 36  
Net of Tax      
Reclassification from AOCI, net of tax (14) 97  
Amortization of net transition obligation      
Before Tax      
Reclassification from AOCI, before tax 2 4  
Tax Effect      
Reclassification from AOCI, tax 0 1  
Net of Tax      
Reclassification from AOCI, net of tax 2 3  
SERPs      
Before Tax      
Other comprehensive income (loss), before tax 17 (137)  
Tax Effect      
Other comprehensive income, tax 5 (37)  
Net of Tax      
Other comprehensive income (loss), before reclassifications, net of tax 0 0  
Reclassification from AOCI, net of tax (12) 100  
Other comprehensive income $ (12) $ 100