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Regulatory Capital Requirements (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Classification
Dec. 31, 2015
USD ($)
Leverage Ratios [Abstract]    
Common equity Tier 1 capital conservation buffer 0.625%  
Tier 1 risk based capital ratio, capital conservation buffer 0.625%  
Total risk based capital ratio, capital conservation buffer 0.625%  
Trustco Bank [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 424,802 $ 405,506
Common equity Tier 1 capital 424,802 405,506
Tier 1 risk-based capital 424,802 405,506
Total risk-based capital $ 455,772 $ 435,149
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 8.829% 8.60%
Common equity Tier 1 capital, ratio 17.238% 17.21%
Tier 1 risk-based capital, ratio 17.238% 17.21%
Total risk-based capital, ratio 18.492% 18.47%
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, well capitalized [1] 5.00% 5.00%
Tier 1 leverage ratio, adequately capitalized [1] 4.00% [2] 4.00%
Common equity Tier 1 capital, well capitalized [1] 6.50% 6.50%
Common equity Tier 1 capital, adequately capitalized [1] 5.125% [2] 4.50%
Tier 1 risk-based capital, well capitalized [1] 8.00% 8.00%
Tier 1 risk-based capital, adequately capitalized [1] 6.625% [2] 6.00%
Total risk-based capital, well capitalized [1] 10.00% 10.00%
Total risk-based capital, adequately capitalized [1] 8.625% [2] 8.00%
Number of classifications for prompt corrective action regulations provide | Classification 5  
TrustCo Bank Corp NY [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 438,426 $ 417,538
Common equity Tier 1 capital 438,426 417,538
Tier 1 risk-based capital 438,426 417,538
Total risk-based capital $ 469,411 $ 447,193
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 9.11% 8.85%
Common equity Tier 1 capital, ratio 17.782% 17.71%
Tier 1 risk-based capital, ratio 17.782% 17.71%
Total risk-based capital, ratio 19.038% 18.97%
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, adequately capitalized 4.00% 4.00%
Common equity Tier 1 capital, adequately capitalized 5.125% 4.50%
Tier 1 risk-based capital, adequately capitalized 6.625% 6.00%
Total risk-based capital, adequately capitalized 8.625% 8.00%
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The December 31, 2016 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a transition capital conservation buffer of 0.625 percent