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Regulatory Capital Requirements (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Classification
Dec. 31, 2018
USD ($)
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 $ 516,775 $ 484,581
Common equity Tier 1 capital 516,775 484,581
Tier 1 risk-based capital 516,775 484,581
Total risk-based capital $ 551,975 $ 517,948
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 9.94% 9.767%
Common equity Tier 1 capital, ratio 18.412% 18.233%
Tier 1 risk-based capital, ratio 18.412% 18.233%
Total risk-based capital, ratio 19.666% 19.489%
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, well capitalized [1] 5.00% 5.00%
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 4.00% 4.00%
Common equity Tier 1 capital, well capitalized [1] 6.50% 6.50%
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 7.00% 6.38%
Tier 1 risk-based capital, well capitalized [1] 8.00% 8.00%
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 8.50% 7.88%
Total risk-based capital, well capitalized [1] 10.00% 10.00%
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 10.50% 9.88%
Common equity Tier 1 capital conservation buffer 2.50% 1.88%
Tier 1 risk based capital ratio, capital conservation buffer 2.50% 1.88%
Total risk based capital ratio, capital conservation buffer 2.50% 1.88%
TrustCo Bank Corp NY [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 533,243 $ 499,626
Common equity Tier 1 capital 533,243 499,626
Tier 1 risk-based capital 533,243 499,626
Total risk-based capital $ 568,463 $ 533,009
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 10.254% 10.129%
Common equity Tier 1 capital, ratio 18.988% 18.79%
Tier 1 risk-based capital, ratio 18.988% 18.79%
Total risk-based capital, ratio 20.242% 20.046%
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 4.00% 4.00%
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 7.00% 6.38%
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 8.50% 7.88%
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 10.50% 9.88%
Common equity Tier 1 capital conservation buffer 2.50% 1.88%
Tier 1 risk based capital ratio, capital conservation buffer 2.50% 1.88%
Total risk based capital ratio, capital conservation buffer 2.50% 1.88%
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The December 31, 2019 and 2018 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent, and 1.88 percent repectively.