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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amounts reclassified out of each component of accumulated other comprehensive income      
Net loss on sales of investment securities $ (9,934) $ (2,074) $ 8,506
Income tax (expenses) benefit (14,627) (18,153) (24,841)
Amortization of unrealized losses on investment securities transferred to HTM 7,159 7,440 4,295
Total reclassification adjustments from AOCI for the period, net of tax 53,412 58,669 73,928
Investment Securities      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI (12,571) (6,862) (4,698)
Amortization of net actuarial (gains) losses      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (2) 74 (304)
Tax effect 0 (20) 81
Amounts reclassified from AOCI (2) 54 (223)
Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization   7 (18)
Tax effect   (2) 4
Amounts reclassified from AOCI   5 (14)
Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amounts reclassified from AOCI 2 49 (3,304)
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 12,570 6,813 8,002
Amount Reclassified from AOCI | Investment Securities      
Amounts reclassified out of each component of accumulated other comprehensive income      
Net loss on sales of investment securities 9,934 2,074 0
Income tax (expenses) benefit (2,620) (547) 0
Net of tax 7,314 1,527 0
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 7,159 7,440 6,218
Tax effect (1,902) (2,105) (1,520)
Less: Amortization of unrealized losses on investment securities transferred to HTM 5,257 5,335 4,698
Amount Reclassified from AOCI | Amortization of net actuarial (gains) losses      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (2) (74) 304
Amount Reclassified from AOCI | Amortization of net transition obligation      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 0 7 18
Amount Reclassified from AOCI | Settlement      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization 0 0 4,884
Amount Reclassified from AOCI | Defined Benefit Plans      
Amounts reclassified out of each component of accumulated other comprehensive income      
Amortization (2) (67) 5,206
Tax effect 1 18 (1,902)
Amounts reclassified from AOCI $ (1) $ (49) $ 3,304