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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amounts reclassified out of each component of accumulated other comprehensive income      
Net gains (losses) on sales of investment securities $ (2,074) $ 8,506 $ 150
Income tax (expenses) benefit (18,153) (24,841) (25,758)
Amortization of unrealized losses on investment securities transferred to HTM 7,440 4,295 0
Total reclassification adjustments from AOCI for the period, net of tax 58,669 73,928 79,894
Investment Securities      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI (6,862) (4,698) 110
Amortization of net actuarial gains (losses)      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (74) (304) (1,036)
Tax effect 20 81 291
Amounts reclassified from AOCI (54) (223) (745)
Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 7 18 (18)
Tax effect (2) (4) 4
Amounts reclassified from AOCI 5 14 (14)
Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI 49 (3,304) (759)
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 (6,813) (8,002) (649)
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 (2,074) 0 150
Income tax (expenses) benefit 547 0 (40)
Net of tax (1,527) 0 110
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 (7,440) (6,218) 0
Tax effect 2,105 1,520 0
Less: Amortization of unrealized losses on investment securities transferred to HTM (5,335) (4,698) 0
Amount Reclassified from AOCI | Amortization of net actuarial gains (losses)      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 74 (304) (1,036)
Amount Reclassified from AOCI | Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (7) (18) (18)
Amount Reclassified from AOCI | Settlement      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 0 (4,884) 0
Amount Reclassified from AOCI | Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 67 (5,206) (1,054)
Tax effect (18) 1,902 295
Amounts reclassified from AOCI $ 49 $ (3,304) $ (759)