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Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Total Capital (to risk weighted assets) [Abstract]
Total capital to risk weighted assets	$ 809,685	$ 777,651
Total capital to risk weighted assets ratio	12.74%	13.50%
Minimum capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required for classification as well capitalized to risk weighted assets	10.00%	10.00%
Tier I Capital (to risk weighted assets) [Abstract]
Tier I capital to risk weighted assets	$ 745,341	$ 709,965
Tier I capital to risk weighted assets ratio	11.73%	12.32%
Minimum Tier one capital required for capital adequacy to risk weighted assets	4.00%	4.00%
Tier one capital required for classification as well capitalized to risk weighted assets	6.00%	6.00%
Tier I Capital (to average assets) [Abstract]
Tier I capital to average assets	$ 745,341	$ 709,965
Tier I capital to average assets ratio	9.44%	9.39%
Minimum Tier I leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier I leverage capital required for classification as well capitalized to average assets	5.00%	5.00%
Common Equity Tier 1 Capital [Abstract]
Common equity Tier 1 capital	$ 648,341
Common equity Tier 1 capital ratio	10.20%
Minimum Tier 1 capital required for capital adequacy	4.50%
Tier 1 capital required for classification as well capitalized	6.50%
NBT Bank [Member]
Total Capital (to risk weighted assets) [Abstract]
Total capital to risk weighted assets	$ 724,238	$ 727,771
Total capital to risk weighted assets ratio	11.47%	12.72%
Minimum capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required for classification as well capitalized to risk weighted assets	10.00%	10.00%
Tier I Capital (to risk weighted assets) [Abstract]
Tier I capital to risk weighted assets	$ 659,894	$ 660,086
Tier I capital to risk weighted assets ratio	10.45%	11.54%
Minimum Tier one capital required for capital adequacy to risk weighted assets	4.00%	4.00%
Tier one capital required for classification as well capitalized to risk weighted assets	6.00%	6.00%
Tier I Capital (to average assets) [Abstract]
Tier I capital to average assets	$ 659,894	$ 660,086
Tier I capital to average assets ratio	8.41%	8.79%
Minimum Tier I leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier I leverage capital required for classification as well capitalized to average assets	5.00%	5.00%
Common Equity Tier 1 Capital [Abstract]
Common equity Tier 1 capital	$ 659,894
Common equity Tier 1 capital ratio	10.45%
Minimum Tier 1 capital required for capital adequacy	4.50%
Tier 1 capital required for classification as well capitalized	6.50%

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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