v3.25.2
BORROWINGS (Details) - USD ($)
$ in Thousands
Jan. 02, 2025
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Repurchase Agreements   $ 240,367 $ 175,621
Total short-term borrowings   $ 599,367 500,621
Northway Financial, Inc "NFI"      
Debt Instrument [Line Items]      
Repurchase Agreements $ 65,500    
Junior Subordinated Debt | Subsidiary One      
Debt Instrument [Line Items]      
Interest rate   6.18%  
Long-term Debt   $ 36,083 36,083
Proceeds from Issuance of Subordinated Long-Term Debt $ 10,000    
Debt Instrument, Basis Spread on Variable Rate 0.26161%    
Debt Instrument, Basis Spread on Variable Rate, Additional 1.60%    
Junior Subordinated Debt | Subsidiary Two      
Debt Instrument [Line Items]      
Interest rate   6.07%  
Long-term Debt   $ 8,248 8,248
Proceeds from Issuance of Subordinated Long-Term Debt $ 10,000    
Debt Instrument, Basis Spread on Variable Rate 0.26161%    
Debt Instrument, Basis Spread on Variable Rate, Additional 1.49%    
Junior Subordinated Debt | Subsidiary Three      
Debt Instrument [Line Items]      
Long-term Debt   8,517 0
Junior Subordinated Debt | Subsidiary Four      
Debt Instrument [Line Items]      
Long-term Debt   8,517 0
Subordinated Debt and Junior Subordinated Debt      
Debt Instrument [Line Items]      
Long-term Debt   61,365 44,331
Short-term Debt [Member]      
Debt Instrument [Line Items]      
Total short-term borrowings   599,367 500,621
Short-term Debt [Member] | Customer Repurchase Agreements      
Debt Instrument [Line Items]      
Repurchase Agreements   240,367 175,621
Short-term Debt [Member] | Customer Repurchase Agreements | Northway Financial, Inc "NFI"      
Debt Instrument [Line Items]      
Repurchase Agreements   65,500  
Short-term Debt [Member] | FHLBB and Correspondent Bank Overnight Borrowings      
Debt Instrument [Line Items]      
FHLBB and Correspondent Bank Overnight Borrowings   $ 359,000 $ 325,000