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OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss)    
Beginning balance $ (139,974) $ (2,426)
Change in other comprehensive income (loss) before reclassification 12,322 (138,490)
Amounts reclassified from accumulated other comprehensive income 565 942
Net current period other comprehensive income (loss) 12,887 (137,548)
Ending balance (127,087) (139,974)
Unrealized gains and (Losses) on available- for-sale Securities    
Accumulated Other Comprehensive Income (Loss)    
Beginning balance (128,896) 15,674
Change in other comprehensive income (loss) before reclassification 10,895 (144,568)
Amounts reclassified from accumulated other comprehensive income 1 (2)
Net current period other comprehensive income (loss) 10,896 (144,570)
Ending balance (118,000) (128,896)
Retirement plans    
Accumulated Other Comprehensive Income (Loss)    
Beginning balance (11,078) (18,100)
Change in other comprehensive income (loss) before reclassification 1,427 6,078
Amounts reclassified from accumulated other comprehensive income 564 944
Net current period other comprehensive income (loss) 1,991 7,022
Ending balance $ (9,087) $ (11,078)