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Regulatory Capital Requirements (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Classification
Dec. 31, 2017
USD ($)
Trustco Bank [Member]    
Compliance With Regulatory Capital Requirements Under Banking Regulations Information [Abstract]    
Number of classifications for prompt corrective action regulations provide | Classification 5  
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 484,581 $ 444,931
Common equity Tier 1 capital 484,581 444,931
Tier 1 risk-based capital 484,581 444,931
Total risk-based capital $ 517,948 $ 476,942
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 9.767% 9.152%
Common equity Tier 1 capital, ratio 18.233% 17.46%
Tier 1 risk-based capital, ratio 18.233% 17.46%
Total risk-based capital, ratio 19.489% 18.72%
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] 6.38% [2] 5.75%
Tier 1 risk-based capital, well capitalized [1] 8.00% 8.00%
Tier 1 risk-based capital, adequately capitalized [1] 7.88% [2] 7.25%
Total risk-based capital, well capitalized [1] 10.00% 10.00%
Total risk-based capital, adequately capitalized [1] 9.88% [2] 9.25%
Common equity Tier 1 capital conservation buffer 1.25%  
Tier 1 risk based capital ratio, capital conservation buffer 1.25%  
Total risk based capital ratio, capital conservation buffer 1.25%  
TrustCo Bank Corp NY [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 499,626 $ 459,561
Common equity Tier 1 capital 499,626 459,561
Tier 1 risk-based capital 499,626 459,561
Total risk-based capital $ 533,009 $ 491,590
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 10.129% 9.449%
Common equity Tier 1 capital, ratio 18.79% 18.02%
Tier 1 risk-based capital, ratio 18.79% 18.02%
Total risk-based capital, ratio 20.046% 19.28%
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, adequately capitalized [1],[2] 4.00% 4.00%
Common equity Tier 1 capital, adequately capitalized [1],[2] 6.38% 5.75%
Tier 1 risk-based capital, adequately capitalized [1],[2] 7.88% 7.25%
Total risk-based capital, adequately capitalized [1],[2] 9.88% 9.25%
Common equity Tier 1 capital conservation buffer 1.88% 1.25%
Tier 1 risk based capital ratio, capital conservation buffer 1.88% 1.25%
Total risk based capital ratio, capital conservation buffer 1.88% 1.25%
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The December 31, 2018 and 2017 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a transition capital conservation buffer of 1.88 percent and 1.25 percent respectively.