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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2024
Borrowings [Abstract]  
Information Related to Short-term Borrowings
Information related to short-term borrowings is summarized as follows:

    December 31,
 
(Dollars in thousands)
  
2024
    
2023
    
2022
  
Federal funds purchased:
                  
Balance at year-end
  
$
-
    
$
-
    
$
60,000
  
Average during the year
    
13,016
      
24,575
      
14,644
  
Maximum month end balance
    
78,000
      
60,000
      
80,000
  
Weighted average rate during the year
    
5.47
%
    
5.16
%
    
4.02
%
Weighted average rate at year-end
    
5.54
%
    
5.63
%
    
4.28
%
                         
Securities sold under repurchase agreements:
                        
Balance at year-end
  
$
146,942
    
$
93,651
    
$
86,012
  
Average during the year
    
95,879
      
70,251
      
69,561
  
Maximum month end balance
    
146,942
      
96,195
      
88,637
  
Weighted average rate during the year
    
2.26
%
    
1.06
%
    
0.10
%
Weighted average rate at year-end
    
2.35
%
    
1.49
%
    
0.11
%
                         
Other short-term borrowings:
                        
Balance at year-end
  
$
16,000
    
$
293,000
    
$
439,000
  
Average during the year
    
103,963
      
450,377
      
46,371
  
Maximum month end balance
    
292,000
      
593,000
      
439,000
  
Weighted average rate during the year
    
5.43
%
    
5.24
%
    
4.24
%
Weighted average rate at year-end
    
5.48
%
    
5.28
%
    
4.45
%
Summary of Long-term Debt
Long-term debt consists of obligations having an original maturity at issuance of more than one year. A majority of the Company’s long-term debt is comprised of FHLB advances collateralized by the FHLB stock owned by the Company, and a blanket lien on its residential real estate mortgage loans. As of December 31, 2024 the Company had no callable long-term debt. A summary is as follows:

(Dollars in thousands)
  
December 31, 2024
    
December 31, 2023
  
Maturity
  
Amount
    
Weighted
Average Rate
    
Amount
    
Weighted
Average Rate
  
2025
   $
26,556
      
4.35
%
   $
26,603
      
4.35
%
2031
    
3,088
      
2.45
%
    
3,193
      
2.45
%
Total
  
$
29,644
            
$
29,796
          
Subordinated Debt
The following table summarizes the Company’s subordinated debt:

(Dollars in thousands)
   December 31, 2024    
December 31, 2023
  
Subordinated notes issued June 2020 - fixed interest rate of 5.00% through June 2025 and a variable interest rate equivalent to three-month SOFR plus 4.85% thereafter, maturing July 1, 2030
   $ 98,000    
$
98,000
  
Subordinated notes issued March 2021 and acquired August 2023 - fixed interest rate of 3.50% through June 2026 and a variable interest rate equivalent to three-month SOFR plus 2.80% thereafter, maturing March 31, 2031
     25,000       25,000  
Subtotal subordinated notes
   $
 123,000     $
 123,000  
Unamortized debt issuance costs and unamortized fair value discount
     (1,799 )    
(3,256
)
Total subordinated debt, net
   $ 121,201    
$
119,744
  
Schedule of Debt of VIE where Entity is not Primary Beneficiary
As of December 31, 2024, the Trusts had the following trust preferred securities outstanding and held the following junior subordinated debentures of the Company (dollars in thousands):

Description
Issuance Date
  
Trust
Preferred
Securities
Outstanding
  
Interest Rate
  
Trust
Preferred
Debt Owed
To Trust
  
Final Maturity Date
CNBF Capital Trust I
August 1999
  
$
18,000
  
3-month Term SOFR +
0.26161% plus 2.75%
  
$
18,720
  
August 2029
NBT Statutory Trust I
November 2005
    
5,000
  
3-month Term SOFR +
0.26161% plus 1.40%
    
5,155
  
December 2035
NBT Statutory Trust II
February 2006
    
50,000
  
3-month Term SOFR +
0.26161% plus 1.40%
    
51,547
  
March 2036
Alliance Financial Capital Trust I
December 2003
    
10,000
  
3-month Term SOFR +
0.26161% plus 2.85%
    
10,310
  
January 2034
Alliance Financial Capital Trust II
September 2006
    
15,000
  
3-month Term SOFR +
0.26161% plus 1.65%
    
15,464
  
September 2036