ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amounts reclassified out of each component of accumulated other comprehensive income
Net loss on sales of investment securities	$ (30)	$ (9,934)	$ (2,074)
Income tax (expenses) benefit	(20,801)	(14,627)	(18,153)
Amortization of unrealized losses on investment securities transferred to HTM	6,762	7,159	7,440
Total reclassification adjustments from AOCI for the period, net of tax	77,480	53,412	58,669
Investment Securities
Amounts reclassified out of each component of accumulated other comprehensive income
Amounts reclassified from AOCI	(5,000)	(12,571)	(6,862)
Amortization of net actuarial (gains) losses
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization		2	74
Tax effect		0	(20)
Amounts reclassified from AOCI		2	54
Amortization of net transition obligation
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization			(7)
Tax effect			2
Amounts reclassified from AOCI			(5)
Defined Benefit Plans
Amounts reclassified out of each component of accumulated other comprehensive income
Amounts reclassified from AOCI	0	2	49
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	5,000	12,570	6,813
Amount Reclassified from AOCI | Investment Securities
Amounts reclassified out of each component of accumulated other comprehensive income
Net loss on sales of investment securities	30	9,934	2,074
Income tax (expenses) benefit	(8)	(2,620)	(547)
Net of tax	22	7,314	1,527
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	6,762	7,159	7,440
Tax effect	(1,784)	(1,902)	(2,105)
Less: Amortization of unrealized losses on investment securities transferred to HTM	4,978	5,257	5,335
Amount Reclassified from AOCI | Amortization of net actuarial (gains) losses
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	(2)	(74)
Amount Reclassified from AOCI | Amortization of net transition obligation
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	0	7
Amount Reclassified from AOCI | Defined Benefit Plans
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	(2)	(67)
Tax effect	0	1	18
Amounts reclassified from AOCI	$ 0	$ (1)	$ (49)