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BORROWINGS (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
item
Secured Debt    
BORROWINGS    
Fixed rate FHLB term borrowings   $ 250.0
Revolving credit facility | Community Financial System Inc.    
BORROWINGS    
Maximum borrowing capacity $ 50.0  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember  
Variable interest rate, basis spread 2.25%  
Line of credit facility, extension period 364 days  
Debt Borrowing 50.0 Million Putable At Option of Lender | Secured Debt    
BORROWINGS    
Fixed rate FHLB term borrowings   $ 50.0
FHLB Term borrowings, Number of advances | item   3
Debt Borrowing 50.0 Million Putable At Option of Lender | Secured Debt | Minimum    
BORROWINGS    
FHLB fixed rate advance (in percent)   4.38%
Debt Borrowing 50.0 Million Putable At Option of Lender | Secured Debt | Maximum    
BORROWINGS    
FHLB fixed rate advance (in percent)   4.47%
Debt Borrowing 100.0 Million Putable At Option of Lender    
BORROWINGS    
FHLB fixed rate advance (in percent)   3.73%
Debt Borrowing 100.0 Million Putable At Option of Lender | Secured Debt    
BORROWINGS    
Fixed rate FHLB term borrowings   $ 100.0
FHLB Term borrowings, Number of advances | item   1