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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amounts reclassified out of each component of accumulated other comprehensive income      
Net gains (losses) on sales of investment securities $ 8,506 $ 150 $ (201)
Income tax (expenses) benefit (24,841) (25,758) (11,760)
Amortization of unrealized losses on investment securities transferred to HTM 4,295 0 0
Total reclassification adjustments from AOCI for the period, net of tax 73,928 79,894 37,273
Amortization of net actuarial losses      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 304 1,036 (1,160)
Tax effect (81) (291) 310
Amounts reclassified from AOCI 223 745 (850)
Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 18 18 (18)
Tax effect (4) (4) 5
Amounts reclassified from AOCI 14 14 (13)
Amortization of prior service cost      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization     (14)
Tax effect     4
Amounts reclassified from AOCI     (10)
Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI (3,304) (759) (873)
Investment Securities      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI (4,698) 110 (147)
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 (8,002) (649) (1,020)
Amount Reclassified from AOCI | Amortization of net actuarial losses      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (304) (1,036) (1,160)
Amount Reclassified from AOCI | Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (18) (18) (18)
Amount Reclassified from AOCI | Amortization of prior service cost      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 0 0 (14)
Amount Reclassified from AOCI | Settlement      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (4,884) 0 0
Amount Reclassified from AOCI | Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (5,206) (1,054) (1,192)
Tax effect 1,902 295 319
Amounts reclassified from AOCI (3,304) (759) (873)
Amount Reclassified from AOCI | Investment Securities      
Amounts reclassified out of each component of accumulated other comprehensive income      
Net gains (losses) on sales of investment securities 0 150 (201)
Income tax (expenses) benefit 0 (40) 54
Net of tax 0 110 (147)
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 (6,218) 0 0
Tax effect 1,520 0 0
Net of tax $ (4,698) $ 0 $ 0