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Regulatory Capital Requirements (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Classification
Dec. 31, 2023
USD ($)
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 $ 640,288 $ 636,327
Common equity Tier 1 capital 640,288 636,327
Tier 1 risk-based capital 640,288 636,327
Total risk-based capital $ 683,633 $ 679,924
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.10427 0.10428
Common equity Tier 1 capital, ratio 0.18505 0.1828
Tier 1 risk-based capital, ratio 0.18505 0.1828
Total risk-based capital, ratio 0.19758 0.19532
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 $ 663,400 $ 657,968
Common equity Tier 1 capital 663,400 657,968
Tier 1 risk-based capital 663,400 657,968
Total risk-based capital $ 706,757 $ 701,577
Risk Based Ratios [Abstract]    
Tier 1 leverage ratio, ratio 0.10798 0.1078
Common equity Tier 1 capital, ratio 0.19168 0.18896
Tier 1 risk-based capital, ratio 0.19168 0.18896
Total risk-based capital, ratio 0.20421 0.20149
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 March 31, 2024 and December 31, 2023 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent