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Regulatory Capital Requirements - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Trustco Bank [Member]    
Regulatory Capital Requirements [Abstract]    
Tier 1 leverage capital (in Dollars) $ 672,243 $ 652,668
Tier 1 leverage ratio, ratio 0.10576 0.10618
Tier 1 leverage ratio, well capitalized [1] 0.05 0.05
Tier 1 leverage ratio, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.04 0.04
Common equity tier 1 capital (in Dollars) $ 672,243 $ 652,668
Common equity tier 1 capital, ratio 0.18669 0.18542
Common equity tier 1 capital, well capitalized [1] 0.065 0.065
Common equity Tier 1 capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.07 0.07
Tier 1 risk-based capital (in Dollars) $ 672,243 $ 652,668
Tier 1 risk-based capital, ratio 0.18669 0.18542
Tier 1 risk-based capital, well capitalized [1] 0.08 0.08
Tier 1 risk-based capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.085 0.085
Total risk-based capital (in Dollars) $ 717,360 $ 696,767
Total risk-based capital, ratio 0.19922 0.19795
Total risk-based capital, well capitalized [1] 0.10 0.10
Total risk-based capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.105 0.105
TrustCo Bank Corp NY [Member]    
Regulatory Capital Requirements [Abstract]    
Tier 1 leverage capital (in Dollars) $ 688,505 $ 679,651
Tier 1 leverage ratio, ratio 0.10831 0.11054
Tier 1 leverage ratio, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.04 0.04
Common equity tier 1 capital (in Dollars) $ 688,505 $ 679,651
Common equity tier 1 capital, ratio 0.19116 0.19303
Common equity Tier 1 capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.07 0.07
Tier 1 risk-based capital (in Dollars) $ 688,505 $ 679,651
Tier 1 risk-based capital, ratio 0.19116 0.19303
Tier 1 risk-based capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.085 0.085
Total risk-based capital (in Dollars) $ 733,634 $ 723,762
Total risk-based capital, ratio 0.20369 0.20556
Total risk-based capital, minimum for capital adequacy Plus capital conversion buffer [1],[2] 0.105 0.105
[1] Federal regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized
[2] The September 30, 2025 and December 31, 2024 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent