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Regulatory Capital Requirements (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Classification
Dec. 31, 2022
USD ($)
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 $ 634,460 $ 609,998
Common equity Tier 1 capital 634,460 609,998
Tier 1 risk-based capital 634,460 609,998
Total risk-based capital $ 677,649 $ 651,462
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.10452 0.10116
Common equity Tier 1 capital, ratio 0.18395 0.18431
Tier 1 risk-based capital, ratio 0.18395 0.18431
Total risk-based capital, ratio 0.19647 0.19684
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 $ 654,879 $ 626,628
Common equity Tier 1 capital 654,879 626,628
Tier 1 risk-based capital 654,879 626,628
Total risk-based capital $ 698,079 $ 668,102
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.10785 0.1039
Common equity Tier 1 capital, ratio 0.18982 0.18929
Tier 1 risk-based capital, ratio 0.18982 0.18929
Total risk-based capital, ratio 0.20234 0.20182
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, 2023 and December 31, 2022 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent