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Junior Subordinated Debt (Tables)
12 Months Ended
Dec. 31, 2018
Junior Subordinated Debt [Abstract]  
Schedule of Debt of VIE where Entity is not Primary Beneficiary
As of December 31, 2018, 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 LIBOR
plus 2.75%
 
$
18,720
 
August 2029
NBT Statutory Trust I
November 2005
  
5,000
 
3-month LIBOR
plus 1.40%
  
5,155
 
December 2035
NBT Statutory Trust II
February 2006
  
50,000
 
3-month LIBOR
plus 1.40%
  
51,547
 
March 2036
Alliance Financial Capital Trust I
December 2003
  
10,000
 
3-month LIBOR
plus 2.85%
  
10,310
 
January 2034
Alliance Financial Capital Trust II
September 2006
  
15,000
 
3-month LIBOR
plus 1.65%
  
15,464
 
September 2036