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PENSION AND OTHER BENEFIT PLANS - Funded Status and Amounts Recognized in Balance Sheets and AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2009
Amounts recognized in the consolidated statement of condition were:        
AOCI at year end $ 17,593 $ 27,204 $ 31,301  
Accumulated other comprehensive income (loss), negative postretirement medical plan amendment, arising during period, net of tax       $ 3,500
Pension Benefits        
Change in benefit obligation:        
Benefit obligation at the beginning of year 158,280 151,361    
Defined Benefit Plan, Service Cost 4,693 4,433 4,959  
Defined Benefit Plan, Interest Cost 7,593 7,561 5,334  
Deferred actuarial (gain)/loss (10,542) 5,530    
Benefits paid (18,619) (10,605)    
Benefit obligation at end of year 141,405 158,280 151,361  
Change in plan assets:        
Fair value of plan assets at beginning of year 267,462 244,332    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 18,839 28,746    
Employer contributions 5,342 4,989    
Benefits paid (18,619) (10,605)    
Fair value of plan assets at end of year 273,024 267,462 244,332  
Over/(Under) funded status at year end 131,619 109,182    
Amounts recognized in the consolidated statement of condition were:        
Other assets 145,264 123,263    
Other liabilities (13,645) (14,081)    
Amounts recognized in the consolidated statement of condition were:        
Net loss 21,866 33,977    
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 1,472 2,292    
Pre-tax AOCI 23,338 36,269    
Taxes (5,727) (8,955)    
AOCI at year end 17,611 27,314    
Pension Benefits | Restoration Plan [Member]        
Amounts recognized in the consolidated statement of condition were:        
Initial projected benefit obligation 800 400    
Other Postretirement Benefits Plan [Member]        
Change in benefit obligation:        
Benefit obligation at the beginning of year 1,714 1,656    
Defined Benefit Plan, Service Cost 0 0 0  
Defined Benefit Plan, Interest Cost 86 92 68  
Deferred actuarial (gain)/loss (30) 165    
Benefits paid (182) (199)    
Benefit obligation at end of year 1,588 1,714 1,656  
Change in plan assets:        
Fair value of plan assets at beginning of year 0 0    
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0    
Employer contributions 182 199    
Benefits paid (182) (199)    
Fair value of plan assets at end of year 0 0 $ 0  
Over/(Under) funded status at year end (1,588) (1,714)    
Amounts recognized in the consolidated statement of condition were:        
Other assets 0 0    
Other liabilities (1,588) (1,714)    
Amounts recognized in the consolidated statement of condition were:        
Net loss 341 398    
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax (370) (549)    
Pre-tax AOCI (29) (151)    
Taxes 11 41    
AOCI at year end $ (18) (110)    
Supplemental Employee Retirement Plan [Member] | Executive Officer [Member]        
Defined Benefit Plan, Additional Information [Abstract]        
Defined Benefit Plan, Funding Status [Extensible Enumeration] us-gaap:UnfundedPlanMember      
Change in benefit obligation:        
Benefit obligation at the beginning of year $ 13,600      
Benefit obligation at end of year 12,800 13,600    
Amounts recognized in the consolidated statement of condition were:        
Benefit obligation for defined benefit pension plan prior to plan revaluation $ 127,800 $ 144,200