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Regulatory Capital Requirements
 12 Months Ended
Dec. 31, 2014
Regulatory Capital Requirements [Abstract]  
Regulatory Capital Requirements
(16)  Regulatory Capital Requirements
 
The Company and NBT Bank are subject to various regulatory capital requirements administered by the federal banking agencies.  Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, NBT Bank must meet specific capital guidelines that involve quantitative measures of NBT Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
 
Quantitative measures established by regulation to ensure capital adequacy require the Company and NBT Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 Capital to risk-weighted assets and of Tier 1 capital to average assets. As of December 31, 2014 and 2013, the Company and NBT Bank meet all capital adequacy requirements to which they were subject.
 
Under their prompt corrective action regulations, regulatory authorities are required to take certain supervisory actions (and may take additional discretionary actions) with respect to an undercapitalized institution. Such actions could have a direct material effect on an institution’s financial statements.  The regulations establish a framework for the classification of banks into five categories:  well capitalized, adequately capitalized, under capitalized, significantly under capitalized, and critically under capitalized.  As of December 31, 2014, the most recent notification from NBT Bank’s regulators categorized NBT Bank as well capitalized under the regulatory framework for prompt corrective action.  To be categorized as well capitalized NBT Bank must maintain minimum total risk-based, Tier 1 risk-based, and Tier 1 capital to average asset ratios as set forth in the table below. There are no conditions or events since that notification that management believes have changed NBT Bank’s category.
 
The Company and NBT Bank’s actual capital amounts and ratios are presented as follows:

 
 
Actual
  
Regulatory ratio requirements
 
(Dollars in thousands)
 
Amount
  
Ratio
  
Minimum
capital adequacy
  
For classification
as well capitalized
 
As of December 31, 2014
 
  
  
  
 
Total Capital (to risk weighted assets):
 
  
  
  
 
Company
 
$
777,651
   
13.50
%
  
8.00
%
  
10.00
%
NBT Bank
  
727,771
   
12.72
%
  
8.00
%
  
10.00
%
Tier I Capital (to risk weighted assets)
                
Company
  
709,965
   
12.32
%
  
4.00
%
  
6.00
%
NBT Bank
  
660,086
   
11.54
%
  
4.00
%
  
6.00
%
Tier I Capital (to average assets)
                
Company
  
709,965
   
9.39
%
  
4.00
%
  
5.00
%
NBT Bank
  
660,086
   
8.79
%
  
4.00
%
  
5.00
%
 
                
As of December 31, 2013
                
Total Capital (to risk weighted assets):
                
Company
 
$
723,580
   
12.99
%
  
8.00
%
  
10.00
%
NBT Bank
  
686,194
   
12.41
%
  
8.00
%
  
10.00
%
Tier I Capital (to risk weighted assets)
                
Company
  
653,950
   
11.74
%
  
4.00
%
  
6.00
%
NBT Bank
  
617,038
   
11.16
%
  
4.00
%
  
6.00
%
Tier I Capital (to average assets)
                
Company
  
653,950
   
8.93
%
  
4.00
%
  
5.00
%
NBT Bank
  
617,038
   
8.47
%
  
4.00
%
  
5.00
%