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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Amounts reclassified out of each component of accumulated other comprehensive income                
Net loss on sales of investment securities $ 0     $ (135)     $ 0 $ (135)
Income tax (expenses) benefit (3,760)     (4,349)     (12,569) (13,880)
Amortization of unrealized losses on investment securities transferred to HTM             5,425 3,644
Total reclassification adjustments from AOCI for the period, net of tax 13,305 $ 15,817 $ 12,945 13,141 $ 14,475 $ 16,187 42,067 43,803
Investment Securities                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amounts reclassified from AOCI (1,413)     (1,587)     (3,993) (4,263)
Amortization of net actuarial gain                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization 2     19     2 58
Reclassification from AOCI, tax (1)     (7)     (1) (17)
Amounts reclassified from AOCI 1     12     1 41
Amortization of net transition obligation                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization       (2)       (6)
Reclassification from AOCI, tax       2       2
Amounts reclassified from AOCI       0       (4)
SERP                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amounts reclassified from AOCI 1     12     1 37
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 1,412     1,575     3,992 4,226
Amount Reclassified from AOCI | Investment Securities                
Amounts reclassified out of each component of accumulated other comprehensive income                
Net loss on sales of investment securities 0     135     0 135
Income tax (expenses) benefit 0     (36)     0 (36)
Total reclassification adjustments from AOCI for the period, net of tax 0     99     0 99
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 1,920     2,026     5,425 5,670
Tax effect (507)     (538)     (1,432) (1,506)
Amortization of unrealized losses on investment securities transferred to held-to-maturity 1,413     1,488     3,993 4,164
Amount Reclassified from AOCI | Amortization of net actuarial gain                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization (2)     (19)     (2) (58)
Amount Reclassified from AOCI | Amortization of net transition obligation                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization 0     2     0 6
Amount Reclassified from AOCI | SERP                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization (2)     (17)     (2) (52)
Reclassification from AOCI, tax 1     5     1 15
Amounts reclassified from AOCI $ (1)     $ (12)     $ (1) $ (37)