3.25.2 html 816 365 1 true 73 0 false 10 false false R1.htm 000100 - Document - Document and Entity Information Sheet http://trustcobank.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 010000 - Statement - Consolidated Statements of Income (Unaudited) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfIncomeUnaudited Consolidated Statements of Income (Unaudited) Statements 2 false false R3.htm 020000 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited Consolidated Statements of Comprehensive Income (Unaudited) Statements 3 false false R4.htm 030000 - Statement - Consolidated Statements of Financial Condition (Unaudited) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfFinancialConditionUnaudited Consolidated Statements of Financial Condition (Unaudited) Statements 4 false false R5.htm 030100 - Statement - Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfFinancialConditionUnauditedParenthetical Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) Statements 5 false false R6.htm 040000 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityUnaudited Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Statements 6 false false R7.htm 040100 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityUnauditedParenthetical Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) Statements 7 false false R8.htm 050000 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://trustcobank.com/role/ConsolidatedStatementsOfCashFlowsUnaudited Consolidated Statements of Cash Flows (Unaudited) Statements 8 false false R9.htm 060100 - Disclosure - Financial Statement Presentation Sheet http://trustcobank.com/role/FinancialStatementPresentation Financial Statement Presentation Notes 9 false false R10.htm 060200 - Disclosure - Earnings Per Share Sheet http://trustcobank.com/role/EarningsPerShare Earnings Per Share Notes 10 false false R11.htm 060300 - Disclosure - Benefit Plans Sheet http://trustcobank.com/role/BenefitPlans Benefit Plans Notes 11 false false R12.htm 060400 - Disclosure - Investment Securities Sheet http://trustcobank.com/role/InvestmentSecurities Investment Securities Notes 12 false false R13.htm 060500 - Disclosure - Loan Portfolio and Allowance for Credit Losses Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLosses Loan Portfolio and Allowance for Credit Losses Notes 13 false false R14.htm 060600 - Disclosure - Fair Value of Financial Instruments Sheet http://trustcobank.com/role/FairValueOfFinancialInstruments Fair Value of Financial Instruments Notes 14 false false R15.htm 060700 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) Notes 15 false false R16.htm 060800 - Disclosure - Revenue from Contracts with Customers Sheet http://trustcobank.com/role/RevenueFromContractsWithCustomers Revenue from Contracts with Customers Notes 16 false false R17.htm 060900 - Disclosure - Operating Leases Sheet http://trustcobank.com/role/OperatingLeases Operating Leases Notes 17 false false R18.htm 061000 - Disclosure - Regulatory Capital Requirements Sheet http://trustcobank.com/role/RegulatoryCapitalRequirements Regulatory Capital Requirements Notes 18 false false R19.htm 061100 - Disclosure - Segment Reporting Sheet http://trustcobank.com/role/SegmentReporting Segment Reporting Notes 19 false false R20.htm 061200 - Disclosure - New Accounting Pronouncements Sheet http://trustcobank.com/role/NewAccountingPronouncements New Accounting Pronouncements Notes 20 false false R21.htm 061300 - Disclosure - Insider Trading Arrangements Sheet http://trustcobank.com/role/InsiderTradingArrangements Insider Trading Arrangements Notes 21 false false R22.htm 080200 - Disclosure - Earnings Per Share (Tables) Sheet http://trustcobank.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://trustcobank.com/role/EarningsPerShare 22 false false R23.htm 080300 - Disclosure - Benefit Plans (Tables) Sheet http://trustcobank.com/role/BenefitPlansTables Benefit Plans (Tables) Tables http://trustcobank.com/role/BenefitPlans 23 false false R24.htm 080400 - Disclosure - Investment Securities (Tables) Sheet http://trustcobank.com/role/InvestmentSecuritiesTables Investment Securities (Tables) Tables http://trustcobank.com/role/InvestmentSecurities 24 false false R25.htm 080500 - Disclosure - Loan Portfolio and Allowance for Credit Losses (Tables) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesTables Loan Portfolio and Allowance for Credit Losses (Tables) Tables http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLosses 25 false false R26.htm 080600 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://trustcobank.com/role/FairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://trustcobank.com/role/FairValueOfFinancialInstruments 26 false false R27.htm 080700 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLoss 27 false false R28.htm 080800 - Disclosure - Revenue from Contracts with Customers (Tables) Sheet http://trustcobank.com/role/RevenueFromContractsWithCustomersTables Revenue from Contracts with Customers (Tables) Tables http://trustcobank.com/role/RevenueFromContractsWithCustomers 28 false false R29.htm 080900 - Disclosure - Operating Leases (Tables) Sheet http://trustcobank.com/role/OperatingLeasesTables Operating Leases (Tables) Tables http://trustcobank.com/role/OperatingLeases 29 false false R30.htm 081000 - Disclosure - Regulatory Capital Requirements (Tables) Sheet http://trustcobank.com/role/RegulatoryCapitalRequirementsTables Regulatory Capital Requirements (Tables) Tables http://trustcobank.com/role/RegulatoryCapitalRequirements 30 false false R31.htm 090200 - Disclosure - Earnings Per Share (Details) Sheet http://trustcobank.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://trustcobank.com/role/EarningsPerShareTables 31 false false R32.htm 090300 - Disclosure - Benefit Plans (Details) Sheet http://trustcobank.com/role/BenefitPlansDetails Benefit Plans (Details) Details http://trustcobank.com/role/BenefitPlansTables 32 false false R33.htm 090400 - Disclosure - Investment Securities, Available-for-sale Securities, Amortized Cost and Fair Value (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails Investment Securities, Available-for-sale Securities, Amortized Cost and Fair Value (Details) Details 33 false false R34.htm 090402 - Disclosure - Investment Securities, Available-for-sale Securities, Maturities (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails Investment Securities, Available-for-sale Securities, Maturities (Details) Details 34 false false R35.htm 090404 - Disclosure - Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details) Details 35 false false R36.htm 090406 - Disclosure - Investment Securities, Available-for-sale Securities, Transaction Information (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails Investment Securities, Available-for-sale Securities, Transaction Information (Details) Details 36 false false R37.htm 090408 - Disclosure - Investment Securities, Held-to-maturity Securities, Amortized Cost and Fair Value (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails Investment Securities, Held-to-maturity Securities, Amortized Cost and Fair Value (Details) Details 37 false false R38.htm 090410 - Disclosure - Investment Securities, Held-to-maturity Securities, Maturity (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails Investment Securities, Held-to-maturity Securities, Maturity (Details) Details 38 false false R39.htm 090412 - Disclosure - Investment Securities, Held-to-maturity Securities, Gross Unrealized Loss Position (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesGrossUnrealizedLossPositionDetails Investment Securities, Held-to-maturity Securities, Gross Unrealized Loss Position (Details) Details 39 false false R40.htm 090416 - Disclosure - Investment Securities, Equity Securities (Details) Sheet http://trustcobank.com/role/InvestmentSecuritiesEquitySecuritiesDetails Investment Securities, Equity Securities (Details) Details 40 false false R41.htm 090500 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesRecordedInvestmentInLoansByLoanClassDetails Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) Details 41 false false R42.htm 090502 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesAllowanceForCreditLossesDetails Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses (Details) Details 42 false false R43.htm 090504 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses on Unfunded Commitments (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesAllowanceForCreditLossesOnUnfundedCommitmentsDetails Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses on Unfunded Commitments (Details) Details 43 false false R44.htm 090506 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Risk Category of Loans (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesRiskCategoryOfLoansDetails Loan Portfolio and Allowance for Credit Losses, Risk Category of Loans (Details) Details 44 false false R45.htm 090508 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Past Due (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesPastDueDetails Loan Portfolio and Allowance for Credit Losses, Past Due (Details) Details http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesTables 45 false false R46.htm 090510 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Non-accrual Loans, By Loan Class (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesNonaccrualLoansByLoanClassDetails Loan Portfolio and Allowance for Credit Losses, Non-accrual Loans, By Loan Class (Details) Details 46 false false R47.htm 090512 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Amortized Cost Basis of Loans on Nonaccrual Status (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesAmortizedCostBasisOfLoansOnNonaccrualStatusDetails Loan Portfolio and Allowance for Credit Losses, Amortized Cost Basis of Loans on Nonaccrual Status (Details) Details 47 false false R48.htm 090514 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Based on Impairment Review Method (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesBasedOnImpairmentReviewMethodDetails Loan Portfolio and Allowance for Credit Losses, Based on Impairment Review Method (Details) Details 48 false false R49.htm 090516 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Type of Collateral Dependent Loans by Portfolio Segment (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesTypeOfCollateralDependentLoansByPortfolioSegmentDetails Loan Portfolio and Allowance for Credit Losses, Type of Collateral Dependent Loans by Portfolio Segment (Details) Details 49 false false R50.htm 090518 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesAmortizedCostBasisOfLoansModifiedToBorrowersExperiencingFinancialDifficultyDetails Loan Portfolio and Allowance for Credit Losses, Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) Details 50 false false R51.htm 090520 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Performance of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesPerformanceOfLoansModifiedToBorrowersExperiencingFinancialDifficultyDetails Loan Portfolio and Allowance for Credit Losses, Performance of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) Details 51 false false R52.htm 090522 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesFinancialEffectOfModificationsMadeToBorrowersExperiencingFinancialDifficultyDetails Loan Portfolio and Allowance for Credit Losses, Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) Details 52 false false R53.htm 090524 - Disclosure - Loan Portfolio and Allowance for Credit Losses, Loan Modifications (Details) Sheet http://trustcobank.com/role/LoanPortfolioAndAllowanceForCreditLossesLoanModificationsDetails Loan Portfolio and Allowance for Credit Losses, Loan Modifications (Details) Details 53 false false R54.htm 090600 - Disclosure - Fair Value of Financial Instruments, Assets and Liabilities Measured at Fair Value Recurring Basis (Details) Sheet http://trustcobank.com/role/FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails Fair Value of Financial Instruments, Assets and Liabilities Measured at Fair Value Recurring Basis (Details) Details 54 false false R55.htm 090602 - Disclosure - Fair Value of Financial Instruments, Assets and Liabilities Measured at Fair Value Non-recurring Basis (Details) Sheet http://trustcobank.com/role/FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueNonrecurringBasisDetails Fair Value of Financial Instruments, Assets and Liabilities Measured at Fair Value Non-recurring Basis (Details) Details 55 false false R56.htm 090604 - Disclosure - Fair Value of Financial Instruments, Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Sheet http://trustcobank.com/role/FairValueOfFinancialInstrumentsCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails Fair Value of Financial Instruments, Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Details 56 false false R57.htm 090700 - Disclosure - Accumulated Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax (Details) Sheet http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLossAccumulatedOtherComprehensiveIncomeLossBalancesNetOfTaxDetails Accumulated Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax (Details) Details http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLossTables 57 false false R58.htm 090702 - Disclosure - Accumulated Other Comprehensive Income (Loss), Reclassifications out of Accumulated Other Comprehensive Loss (Details) Sheet http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Income (Loss), Reclassifications out of Accumulated Other Comprehensive Loss (Details) Details http://trustcobank.com/role/AccumulatedOtherComprehensiveIncomeLossTables 58 false false R59.htm 090800 - Disclosure - Revenue from Contracts with Customers (Details) Sheet http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails Revenue from Contracts with Customers (Details) Details http://trustcobank.com/role/RevenueFromContractsWithCustomersTables 59 false false R60.htm 090900 - Disclosure - Operating Leases (Details) Sheet http://trustcobank.com/role/OperatingLeasesDetails Operating Leases (Details) Details http://trustcobank.com/role/OperatingLeasesTables 60 false false R61.htm 091000 - Disclosure - Regulatory Capital Requirements (Details) Sheet http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails Regulatory Capital Requirements (Details) Details http://trustcobank.com/role/RegulatoryCapitalRequirementsTables 61 false false R62.htm 091100 - Disclosure - Segment Reporting (Details) Sheet http://trustcobank.com/role/SegmentReportingDetails Segment Reporting (Details) Details http://trustcobank.com/role/SegmentReporting 62 false false All Reports Book All Reports ef20050410_10q.htm trst-20250630.xsd trst-20250630_cal.xml trst-20250630_def.xml trst-20250630_lab.xml trst-20250630_pre.xml image00001.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true