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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of unrealized losses on investment securities transferred to HTM         $ 3,644 $ 1,976
Total reclassification adjustments from AOCI for the period, net of tax $ 14,475 $ 16,187 $ 17,594 $ 19,438 30,662 37,032
Amortization of net actuarial losses            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 20   (131)   39 (264)
Reclassification from AOCI, tax (5)   35   (10) 71
Amounts reclassified from AOCI 15   (96)   29 (193)
Amortization of net transition obligation            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization (2)   (5)   (4) (9)
Reclassification from AOCI, tax 0   1   0 2
Amounts reclassified from AOCI (2)   (4)   (4) (7)
SERPs            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amounts reclassified from AOCI 13   (3,167)   25 (3,267)
Settlement            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization           (4,884)
Reclassification from AOCI, tax           1,817
Amounts reclassified from AOCI           (3,067)
Net actuarial losses arising during the period            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization           (952)
Reclassification from AOCI, tax           255
Amounts reclassified from AOCI           (697)
Amount Reclassified from AOCI            
Amounts reclassified out of each component of accumulated other comprehensive income            
Total reclassification adjustments from AOCI for the period, net of tax (1,438)   (4,615)   (2,651) (4,715)
Amount Reclassified from AOCI | Accumulated Net Unrealized Loss on Held To Maturity Securities            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of unrealized losses on investment securities transferred to HTM (1,976)   (1,976)   (3,644) (1,976)
Tax effect 525   528   968 528
Amortization of unrealized losses on investment securities transferred to held-to-maturity (1,451)   (1,448)   (2,676) (1,448)
Amount Reclassified from AOCI | Amortization of net actuarial losses            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 20   (131)   39 (264)
Amount Reclassified from AOCI | Amortization of net transition obligation            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization (2)   (5)   (4) (9)
Amount Reclassified from AOCI | SERPs            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 18   (5,020)   35 (5,157)
Reclassification from AOCI, tax (5)   1,853   (10) 1,890
Amounts reclassified from AOCI $ 13   $ (3,167)   25 (3,267)
Amount Reclassified from AOCI | Settlement            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization         $ 0 $ (4,884)