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Regulatory Capital Requirements (Details)
$ in Thousands
Sep. 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 $ 597,092 $ 570,594
Common equity Tier 1 capital 597,092 570,594
Tier 1 risk-based capital 597,092 570,594
Total risk-based capital $ 637,906 $ 608,308
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.09648 0.09324
Common equity Tier 1 capital, ratio 0.18333 0.18954
Tier 1 risk-based capital, ratio 0.18333 0.18954
Total risk-based capital, ratio 0.19586 0.20206
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, well capitalized [1] 0.05 0.05
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 0.04 0.04
Common equity Tier 1 capital, well capitalized [1] 0.065 0.065
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 0.07 0.07
Tier 1 risk-based capital, well capitalized [1] 0.08 0.08
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.085 0.085
Total risk-based capital, well capitalized [1] 0.10 0.10
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.105 0.105
Common equity Tier 1 capital conservation buffer 0.025 0.025
Tier 1 risk based capital ratio, capital conservation buffer 0.025 0.025
Total risk based capital ratio, capital conservation buffer 0.025 0.025
TrustCo Bank Corp NY [Member]    
Tier One Risk Based Capital [Abstract]    
Tier 1 leverage capital $ 613,661 $ 588,427
Common equity Tier 1 capital 613,661 588,427
Tier 1 risk-based capital 613,661 588,427
Total risk-based capital $ 654,486 $ 626,150
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.09913 0.09614
Common equity Tier 1 capital, ratio 0.18837 0.19541
Tier 1 risk-based capital, ratio 0.18837 0.19541
Total risk-based capital, ratio 0.2009 0.20794
Leverage Ratios [Abstract]    
Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation [1],[2] 0.04 0.04
Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation [1],[2] 0.07 0.07
Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.085 0.085
Total risk-based capital, minimum for capital adequacy plus capital conservation [1],[2] 0.105 0.105
Common equity Tier 1 capital conservation buffer 0.025 0.025
Tier 1 risk based capital ratio, capital conservation buffer 0.025 0.025
Total risk based capital ratio, capital conservation buffer 0.025 0.025
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The September 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