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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Before Tax                
Amortization             $ (3,644) $ (4,295)
Other comprehensive income (loss), before tax $ (19,434)     $ (31,150)     (7,593) (192,165)
Tax Effect                
Other comprehensive income, tax (5,162)     (8,329)     (2,030) (50,872)
Net of Tax                
Other comprehensive loss (14,272) $ (2,547) $ 11,256 (22,821) $ (39,085) $ (79,387) (5,563) (141,293)
Net unrealized gains on investment securities                
Before Tax                
Other comprehensive income (loss) before reclassification, before tax (24,729)     (37,854)     (17,675) (207,930)
Reclassification from AOCI, before tax 135           135  
Amortization 2,026     2,319     5,670 4,295
Other comprehensive income (loss), before tax (22,568)     (35,535)     (11,870) (203,635)
Tax Effect                
Other comprehensive income (loss) before reclassifications, tax (6,569)     (10,122)     (4,696) (55,598)
Less: Amortization of unrealized losses on investment securities transferred to HTM 538     620     1,506 1,148
Reclassification from AOCI, tax 36           36  
Other comprehensive income, tax (5,995)     (9,502)     (3,154) (54,450)
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax (18,160)     (27,732)     (12,979) (152,332)
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,488     1,699     4,164 3,147
Reclassification from AOCI, net of tax 99           99  
Other comprehensive loss (16,573)     (26,033)     (8,716) (149,185)
Net change in fair value of derivatives:                
Before Tax                
Other comprehensive income (loss) before reclassification, before tax 3,151     4,360     4,329 7,240
Other comprehensive income (loss), before tax 3,151     4,360     4,329 7,240
Tax Effect                
Other comprehensive income (loss) before reclassifications, tax 838     1,166     1,139 1,936
Other comprehensive income, tax 838     1,166     1,139 1,936
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax 2,313     3,194     3,190 5,304
Other comprehensive loss 2,313     3,194     3,190 5,304
Amortization of net actuarial gain                
Before Tax                
Reclassification from AOCI, before tax (19)     20     (58) 284
Tax Effect                
Reclassification from AOCI, tax (7)     5     (17) 76
Net of Tax                
Reclassification from AOCI, net of tax (12)     15     (41) 208
Amortization of net transition obligation                
Before Tax                
Reclassification from AOCI, before tax 2     5     6 14
Tax Effect                
Reclassification from AOCI, tax 2     2     2 4
Net of Tax                
Reclassification from AOCI, net of tax 0     3     4 10
SERPs                
Before Tax                
Other comprehensive income (loss), before tax 17     (25)     52 (4,230)
Tax Effect                
Other comprehensive income, tax 5     (7)     15 (1,642)
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax 0     0     0 (697)
Reclassification from AOCI, net of tax (12)     18     (37) 3,285
Other comprehensive loss $ (12)     $ 18     $ (37) $ 2,588