Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest and dividend income:
Interest and fees on loans	$ 34,983	$ 32,874
Interest and dividends on securities available for sale:
U. S. government sponsored enterprises	212	506
State and political subdivisions	25	68
Mortgage-backed securities and collateralized mortgage obligations-residential	2,393	3,078
Corporate bonds	1	59
Small Business Administration-guaranteed participation securities	522	556
Mortgage-backed securities and collateralized mortgage obligations-commercial	37	38
Other securities	4	4
Total interest and dividends on securities available for sale	3,194	4,309
Interest on held to maturity securities:
Mortgage-backed securities and collateralized mortgage obligations-residential	478	625
Corporate bonds	154	154
Total interest on held to maturity securities	632	779
Federal Reserve Bank and Federal Home Loan Bank stock	116	133
Interest on federal funds sold and other short-term investments	400	351
Total interest income	39,325	38,446
Interest on deposits [Abstract]
Interest-bearing checking	105	84
Savings	658us-gaap_InterestExpenseSavingsDeposits	763us-gaap_InterestExpenseSavingsDeposits
Money market deposit accounts	617	599
Time deposits	2,434us-gaap_InterestExpenseTimeDeposits	1,951us-gaap_InterestExpenseTimeDeposits
Interest on short-term borrowings	346	393
Total interest expense	4,160us-gaap_InterestExpense	3,790us-gaap_InterestExpense
Net interest income	35,165us-gaap_InterestIncomeExpenseNet	34,656us-gaap_InterestIncomeExpenseNet
Provision for loan losses	800us-gaap_ProvisionForLoanAndLeaseLosses	1,500us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	34,365	33,156
Noninterest income:
Trustco financial services income	1,653	1,510
Fees for services to customers	2,524us-gaap_FeesAndCommissionsOther	2,521us-gaap_FeesAndCommissionsOther
Net gain on securities transactions	249us-gaap_GainLossOnSaleOfSecuritiesNet	6us-gaap_GainLossOnSaleOfSecuritiesNet
Other	197us-gaap_NoninterestIncomeOther	1,722us-gaap_NoninterestIncomeOther
Total noninterest income	4,623us-gaap_NoninterestIncome	5,759us-gaap_NoninterestIncome
Noninterest expenses:
Salaries and employee benefits	8,481us-gaap_LaborAndRelatedExpense	7,592us-gaap_LaborAndRelatedExpense
Net occupancy expense	4,108us-gaap_OccupancyNet	4,259us-gaap_OccupancyNet
Equipment expense	1,942us-gaap_EquipmentExpense	1,752us-gaap_EquipmentExpense
Professional services	1,507us-gaap_ProfessionalFees	1,286us-gaap_ProfessionalFees
Outsourced services	1,425trst_OutsourcedServices	1,325trst_OutsourcedServices
Advertising expense	600us-gaap_AdvertisingExpense	599us-gaap_AdvertisingExpense
FDIC and other insurance	1,065us-gaap_GeneralInsuranceExpense	904us-gaap_GeneralInsuranceExpense
Other real estate expense, net	424us-gaap_ForeclosedRealEstateExpense	855us-gaap_ForeclosedRealEstateExpense
Other	2,305us-gaap_OtherNoninterestExpense	2,229us-gaap_OtherNoninterestExpense
Total noninterest expenses	21,857us-gaap_NoninterestExpense	20,801us-gaap_NoninterestExpense
Income before taxes	17,131	18,114
Income taxes	6,416us-gaap_IncomeTaxExpenseBenefit	7,103us-gaap_IncomeTaxExpenseBenefit
Net income	$ 10,715us-gaap_NetIncomeLoss	$ 11,011us-gaap_NetIncomeLoss
Net income per Common Share:
Basic (in dollars per share)	$ 0.113us-gaap_EarningsPerShareBasic	$ 0.116us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.113us-gaap_EarningsPerShareDiluted	$ 0.116us-gaap_EarningsPerShareDiluted

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Interest or dividend income, including any amortization and accretion (as applicable) of discounts and premiums, derived from SBA guaranteed participation securities and classified as available for sale securities.

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one banking institution which it lends to another banking institution, usually at an agreed-upon rate of interest. Such loans are made for legal reserve requirement purposes of the borrowing bank and generally are overnight. Also interest income on interest earning investments not otherwise specified in the taxonomy that are of short-duration, including the outstanding balance with the Federal Reserve Bank.

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A fee charged for services from data processing and item processing vendors. The Company has outsourced these services to unrelated third parties as opposed to performing them with its own in-house employees as a way to limit software, equipment and personnel costs.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense related to estimated loss from loan and lease transactions.

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