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Regulatory Capital Requirements (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Set
Dec. 31, 2012
Tier One Risk Based Capital [Abstract]    
Tier One Risk Based Capital $ 375,063,000 $ 356,687,000
Total risk-based capital 403,317,000 383,678,000
Risk Based Ratios [Abstract]    
Tier 1 risk-based capital, ratio (in hundredths) 16.74% 16.68%
Total risk-based capital, ratio (in hundredths) 18.00% 17.94%
Leverage Capital [Abstract]    
Leverage Capital 375,063,000 356,687,000
Tier One Risk Based Capital 375,063,000 356,687,000
Total risk-based capital 403,317,000 383,678,000
Leverage Ratios [Abstract]    
Leverage Capital, ratio (in hundredths) 8.27% 8.21%
Tier 1 risk-based capital, ratio (in hundredths) 16.74% 16.68%
Total risk-based capital, ratio (in hundredths) 18.00% 17.94%
Number of overlapping sets of regulatory capital requirements 2  
Minimum tangible capital as percentage of tangible assets required (in hundredths) 1.50%  
Leverage ratio for the most highly rated institutions (in hundredths) 3.00%  
Top-tier savings and loans bank threshold total consolidated assets 500,000,000  
Tier 1 minimum capital requirement, future common equity rule (in hundredths) 4.50%  
Minimum tier 1 capital to risk-based assets requirement affected on January 1, 2015 (in hundredths) 6.00%  
Trustco Bank [Member]
   
Tier One Risk Based Capital [Abstract]    
Tier 1 (core) capital 365,954,000 349,580,000
Tier One Risk Based Capital 365,954,000 349,580,000
Total risk-based capital 394,200,000 376,565,000
Risk Based Ratios [Abstract]    
Tier 1 (core) capital, ratio (in hundredths) 8.07% 8.05%
Tier 1 (core) capital, Well Capitalized (in hundredths) 5.00% [1] 5.00% [1]
Tier 1 (core) capital, Adequately Capitalized (in hundredths) 4.00% [1] 4.00% [1]
Tier 1 risk-based capital, ratio (in hundredths) 16.34% 16.35%
Tier 1 risk-based capital, Well Capitalized (in hundredths) 6.00% [1] 6.00% [1]
Tier 1 risk-based capital, Adequately Capitalized (in hundredths) 4.00% [1] 4.00% [1]
Total risk-based capital, ratio (in hundredths) 17.60% 17.62%
Total risk-based capital, Well Capitalized (in hundredths) 10.00% [1] 10.00% [1]
Total risk-based capital, Adequately Capitalized (in hundredths) 8.00% [1] 8.00% [1]
Leverage Capital [Abstract]    
Tier One Risk Based Capital 365,954,000 349,580,000
Total risk-based capital $ 394,200,000 $ 376,565,000
Leverage Ratios [Abstract]    
Tier 1 risk-based capital, ratio (in hundredths) 16.34% 16.35%
Total risk-based capital, ratio (in hundredths) 17.60% 17.62%
[1] Regulatory minimum requirements to be considered to be Well Capitalized and Adequately Capitalized