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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Before Tax                
Amortization             $ (4,295) $ 0
Other comprehensive income (loss), before tax $ (31,150)     $ (9,090)     (192,165) (29,825)
Tax Effect                
Other comprehensive income, tax (8,329)     (2,431)     (50,872) (7,964)
Net of Tax                
Other comprehensive loss (22,821) $ (39,085) $ (79,387) (6,659) $ 1,915 $ (17,117) (141,293) (21,861)
Net unrealized gains on investment securities                
Before Tax                
Other comprehensive income (loss) before reclassification, before tax (37,854)     (9,254)     (207,930) (30,466)
Reclassification from AOCI, before tax       (100)       (150)
Amortization 2,319           4,295  
Other comprehensive income (loss), before tax (35,535)     (9,354)     (203,635) (30,616)
Tax Effect                
Other comprehensive income (loss) before reclassifications, tax (10,122)     (2,475)     (55,598) (8,150)
Less: Amortization of unrealized losses on investment securities transferred to HTM 620           1,148  
Reclassification from AOCI, tax       (27)       (40)
Other comprehensive income, tax (9,502)     (2,502)     (54,450) (8,190)
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax (27,732)     (6,779)     (152,332) (22,316)
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,699           3,147  
Reclassification from AOCI, net of tax       (73)       (110)
Other comprehensive loss (26,033)     (6,852)     (149,185) (22,426)
Net change in fair value of derivatives:                
Before Tax                
Other comprehensive income (loss) before reclassification, before tax 4,360           7,240  
Other comprehensive income (loss), before tax 4,360           7,240  
Tax Effect                
Other comprehensive income (loss) before reclassifications, tax 1,166           1,936  
Other comprehensive income, tax 1,166           1,936  
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax 3,194           5,304  
Other comprehensive loss 3,194           5,304  
Amortization of net actuarial loss                
Before Tax                
Reclassification from AOCI, before tax 20     259     284 777
Tax Effect                
Reclassification from AOCI, tax 5     70     76 222
Net of Tax                
Reclassification from AOCI, net of tax 15     189     208 555
Amortization of net transition obligation                
Before Tax                
Reclassification from AOCI, before tax 5     5     14 14
Tax Effect                
Reclassification from AOCI, tax 2     1     4 4
Net of Tax                
Reclassification from AOCI, net of tax 3     4     10 10
Settlement                
Before Tax                
Reclassification from AOCI, before tax             4,884  
Tax Effect                
Reclassification from AOCI, tax             1,817  
Net of Tax                
Reclassification from AOCI, net of tax             3,067  
SERPs                
Before Tax                
Other comprehensive income (loss), before tax (25)     (264)     (4,230) (791)
Tax Effect                
Other comprehensive income, tax (7)     (71)     (1,642) (226)
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax 0     0     (697) 0
Reclassification from AOCI, net of tax 18     193     3,285 565
Other comprehensive loss $ 18     $ 193     2,588 $ 565
Net actuarial losses arising during the period                
Before Tax                
Reclassification from AOCI, before tax             (952)  
Tax Effect                
Reclassification from AOCI, tax             (255)  
Net of Tax                
Reclassification from AOCI, net of tax             $ (697)