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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of unrealized losses on investment securities transferred to HTM         $ 3,505 $ 3,644
Total reclassification adjustments from AOCI for the period, net of tax $ 15,817 $ 12,945 $ 14,475 $ 16,187 28,762 30,662
Amortization of net actuarial gain            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization     20     39
Reclassification from AOCI, tax     (5)     (10)
Amounts reclassified from AOCI     15     29
Amortization of net transition obligation            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization     (2)     (4)
Reclassification from AOCI, tax     0     0
Amounts reclassified from AOCI     (2)     (4)
SERP            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amounts reclassified from AOCI 0   13   0 25
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 1,374   1,438   2,580 2,651
Amount Reclassified from AOCI | Amortization of unrealized losses on investment securities transferred to HTM            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of unrealized losses on investment securities transferred to HTM 1,867   1,976   3,505 3,644
Tax effect (493)   (525)   (925) (968)
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,374   1,451   2,580 2,676
Amount Reclassified from AOCI | Amortization of net actuarial gain            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 0   (20)   0 (39)
Amount Reclassified from AOCI | Amortization of net transition obligation            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 0   2   0 4
Amount Reclassified from AOCI | SERP            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization 0   (18)   0 (35)
Reclassification from AOCI, tax 0   5   0 10
Amounts reclassified from AOCI $ 0   $ (13)   $ 0 $ (25)