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Regulatory Capital Requirements (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Classification
Dec. 31, 2021
USD ($)
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 $ 585,724 $ 570,594
Common equity Tier 1 capital 585,724 570,594
Tier 1 risk-based capital 585,724 570,594
Total risk-based capital $ 625,754 $ 608,308
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.09390 0.09324
Common equity Tier 1 capital, ratio 0.18339 0.18954
Tier 1 risk-based capital, ratio 0.18339 0.18954
Total risk-based capital, ratio 0.19592 0.20206
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, well capitalized [1] 0.05000 0.05000
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 0.04000 0.04000
Common equity Tier 1 capital, well capitalized [1] 0.06500 0.06500
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 0.07000 0.07000
Tier 1 risk-based capital, well capitalized [1] 0.08000 0.08000
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.08500 0.08500
Total risk-based capital, well capitalized [1] 0.10000 0.10000
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.10500 0.10500
Common equity Tier 1 capital conservation buffer 0.0250 0.0250
Tier 1 risk based capital ratio, capital conservation buffer 0.0250 0.0250
Total risk based capital ratio, capital conservation buffer 0.0250 0.0250
TrustCo Bank Corp NY [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 603,500 $ 588,427
Common equity Tier 1 capital 603,500 588,427
Tier 1 risk-based capital 603,500 588,427
Total risk-based capital $ 643,541 $ 626,150
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.09673 0.09614
Common equity Tier 1 capital, ratio 0.18891 0.19541
Tier 1 risk-based capital, ratio 0.18891 0.19541
Total risk-based capital, ratio 0.20144 0.20794
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 0.04000 0.04000
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 0.07000 0.07000
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.08500 0.08500
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.10500 0.10500
Common equity Tier 1 capital conservation buffer 0.0250 0.0250
Tier 1 risk based capital ratio, capital conservation buffer 0.0250 0.0250
Total risk based capital ratio, capital conservation buffer 0.0250 0.0250
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The June 30, 2022 and December 31, 2021 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent