XML 82 R69.htm IDEA: XBRL DOCUMENT v3.26.1
Regulatory Capital Requirements - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Trustco Bank [Member]    
Regulatory Capital Requirements [Abstract]    
Tier 1 leverage capital (in Dollars) $ 530,666 $ 513,719
Tier 1 leverage ratio, ratio 0.0825 0.08058
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) $ 530,666 $ 513,719
Common equity tier 1 capital, ratio 0.14262 0.13981
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) $ 530,666 $ 513,719
Tier 1 risk-based capital, ratio 0.14262 0.13981
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) $ 577,284 $ 559,750
Total risk-based capital, ratio 0.15515 0.15234
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
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]    
Regulatory Capital Requirements [Abstract]    
Tier 1 leverage capital (in Dollars) $ 662,125 $ 676,012
Tier 1 leverage ratio, ratio 0.1029 0.10601
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) $ 662,125 $ 676,012
Common equity tier 1 capital, ratio 0.1779 0.18393
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) $ 662,125 $ 676,012
Tier 1 risk-based capital, ratio 0.1779 0.18393
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) $ 708,755 $ 722,055
Total risk-based capital, ratio 0.19043 0.19646
Total risk-based capital, minimum for capital adequacy Plus capital conversion buffer [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, 2026 and December 31, 2025 common equity tier 1, tier 1 risk-based, and total risk-based capital ratios include a capital conservation buffer of 2.50 percent