{ "instance": { "form10k.htm ex13.htm": { "axisCustom": 0, "axisStandard": 31, "contextCount": 642, "dts": { "calculationLink": { "local": [ "trst-20191231_cal.xml" ] }, "definitionLink": { "local": [ "us-gaap-eedm-def-2019-01-31.xml", "srt-eedm1-def-2019-01-31.xml", "trst-20191231_def.xml" ] }, "inline": { "local": [ "form10k.htm", "ex13.htm" ] }, "labelLink": { "local": [ "trst-20191231_lab.xml", "dei-doc-2019-01-31.xml", "us-gaap-doc-2019-01-31.xml", "srt-doc-2019-01-31.xml" ] }, "presentationLink": { "local": [ "trst-20191231_pre.xml" ] }, "referenceLink": { "local": [ "dei-ref-2019-01-31.xml", "us-gaap-ref-2019-01-31.xml", "srt-ref-2019-01-31.xml" ] }, "schema": { "local": [ "trst-20191231.xsd", "xbrl-linkbase-2003-12-31.xsd", "xl-2003-12-31.xsd", "xlink-2003-12-31.xsd", "net-2009-12-16.xsd", "negated-2009-12-16.xsd", "dei-2019-01-31.xsd", "xbrl-instance-2003-12-31.xsd", "xbrldt-2005.xsd", "nonNumeric-2009-12-16.xsd", "numeric-2009-12-16.xsd", "us-gaap-2019-01-31.xsd", "us-roles-2019-01-31.xsd", "srt-2019-01-31.xsd", "ref-2006-02-27.xsd", "srt-types-2019-01-31.xsd", "srt-roles-2019-01-31.xsd", "country-2017-01-31.xsd", "us-types-2019-01-31.xsd", "stpr-2018-01-31.xsd", "currency-2019-01-31.xsd", "exch-2019-01-31.xsd", "naics-2017-01-31.xsd", "sic-2011-01-31.xsd", "ref-2004-08-10.xsd", "factExplanatory-2009-12-16.xsd", "deprecated-2009-12-16.xsd", "reference-2009-12-16.xsd", "us-parts-codification-2019-01-31.xsd" ] } }, "elementCount": 918, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2019-01-31": 9, "http://trustcobank.com/20191231": 2, "http://xbrl.sec.gov/dei/2019-01-31": 7, "total": 18 }, "keyCustom": 110, "keyStandard": 504, "memberCustom": 23, "memberStandard": 71, "nsprefix": "trst", "nsuri": "http://trustcobank.com/20191231", "report": { "R1": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "baseRef": "form10k.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "dei:EntityRegistrantName", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "000100 - Document - Document and Entity Information", "role": "http://trustcobank.com/role/DocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "baseRef": "form10k.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "dei:EntityRegistrantName", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:FederalReserveBankReserveRequirementTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060200 - Disclosure - Balances at Other Banks", "role": "http://trustcobank.com/role/BalancesAtOtherBanks", "shortName": "Balances at Other Banks", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:FederalReserveBankReserveRequirementTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060300 - Disclosure - Investment Securities", "role": "http://trustcobank.com/role/InvestmentSecurities", "shortName": "Investment Securities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FinancingReceivablesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060400 - Disclosure - Loans and Allowance for Loan Losses", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLosses", "shortName": "Loans and Allowance for Loan Losses", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FinancingReceivablesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060500 - Disclosure - Bank Premises and Equipment", "role": "http://trustcobank.com/role/BankPremisesAndEquipment", "shortName": "Bank Premises and Equipment", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DepositLiabilitiesDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060600 - Disclosure - Deposits", "role": "http://trustcobank.com/role/Deposits", "shortName": "Deposits", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DepositLiabilitiesDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060700 - Disclosure - Short-Term Borrowings", "role": "http://trustcobank.com/role/ShorttermBorrowings", "shortName": "Short-Term Borrowings", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060800 - Disclosure - Income Taxes", "role": "http://trustcobank.com/role/IncomeTaxes", "shortName": "Income Taxes", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060900 - Disclosure - Benefit Plans", "role": "http://trustcobank.com/role/BenefitPlans", "shortName": "Benefit Plans", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061000 - Disclosure - Commitments and Contingent Liabilities", "role": "http://trustcobank.com/role/CommitmentsAndContingentLiabilities", "shortName": "Commitments and Contingent Liabilities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061100 - Disclosure - Earnings Per Share", "role": "http://trustcobank.com/role/EarningsPerShare", "shortName": "Earnings Per Share", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "010000 - Statement - Consolidated Statements of Income", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "shortName": "Consolidated Statements of Income", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestAndFeeIncomeLoansAndLeases", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:FairValueOffBalanceSheetRisksTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061200 - Disclosure - Off-Balance Sheet Financial Instruments", "role": "http://trustcobank.com/role/OffbalanceSheetFinancialInstruments", "shortName": "Off-Balance Sheet Financial Instruments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:FairValueOffBalanceSheetRisksTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061300 - Disclosure - Fair Value", "role": "http://trustcobank.com/role/FairValue", "shortName": "Fair Value", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061400 - Disclosure - Regulatory Capital Requirements", "role": "http://trustcobank.com/role/RegulatoryCapitalRequirements", "shortName": "Regulatory Capital Requirements", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ComprehensiveIncomeNoteTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061500 - Disclosure - Accumulated Other Comprehensive Loss", "role": "http://trustcobank.com/role/AccumulatedOtherComprehensiveLoss", "shortName": "Accumulated Other Comprehensive Loss", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ComprehensiveIncomeNoteTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061600 - Disclosure - Revenue from Contracts with Customers", "role": "http://trustcobank.com/role/RevenueFromContractsWithCustomers", "shortName": "Revenue from Contracts with Customers", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061700 - Disclosure - Operating leases", "role": "http://trustcobank.com/role/OperatingLeases", "shortName": "Operating leases", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061800 - Disclosure - Recent Accounting Pronouncements", "role": "http://trustcobank.com/role/RecentAccountingPronouncements", "shortName": "Recent Accounting Pronouncements", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "061900 - Disclosure - Parent Company Only", "role": "http://trustcobank.com/role/ParentCompanyOnly", "shortName": "Parent Company Only", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ConsolidationPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "070100 - Disclosure - Basis of Presentation (Policies)", "role": "http://trustcobank.com/role/BasisOfPresentationPolicies", "shortName": "Basis of Presentation (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ConsolidationPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080300 - Disclosure - Investment Securities (Tables)", "role": "http://trustcobank.com/role/InvestmentSecuritiesTables", "shortName": "Investment Securities (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "020000 - Statement - Consolidated Statements of Comprehensive Income", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome", "shortName": "Consolidated Statements of Comprehensive Income", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080400 - Disclosure - Loans and Allowance for Loan Losses (Tables)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables", "shortName": "Loans and Allowance for Loan Losses (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080500 - Disclosure - Bank Premises and Equipment (Tables)", "role": "http://trustcobank.com/role/BankPremisesAndEquipmentTables", "shortName": "Bank Premises and Equipment (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:InterestExpenseOnDepositsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080600 - Disclosure - Deposits (Tables)", "role": "http://trustcobank.com/role/DepositsTables", "shortName": "Deposits (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:InterestExpenseOnDepositsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080700 - Disclosure - Short-Term Borrowings (Tables)", "role": "http://trustcobank.com/role/ShorttermBorrowingsTables", "shortName": "Short-Term Borrowings (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShortTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080800 - Disclosure - Income Taxes (Tables)", "role": "http://trustcobank.com/role/IncomeTaxesTables", "shortName": "Income Taxes (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:ChangeInComponentOfOtherComprehensiveIncomeRelatedToRetirementPlanAndPostRetirementBenefitPlanTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "080900 - Disclosure - Benefit Plans (Tables)", "role": "http://trustcobank.com/role/BenefitPlansTables", "shortName": "Benefit Plans (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:ChangeInComponentOfOtherComprehensiveIncomeRelatedToRetirementPlanAndPostRetirementBenefitPlanTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081100 - Disclosure - Earnings Per Share (Tables)", "role": "http://trustcobank.com/role/EarningsPerShareTables", "shortName": "Earnings Per Share (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081300 - Disclosure - Fair Value (Tables)", "role": "http://trustcobank.com/role/FairValueTables", "shortName": "Fair Value (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081400 - Disclosure - Regulatory Capital Requirements (Tables)", "role": "http://trustcobank.com/role/RegulatoryCapitalRequirementsTables", "shortName": "Regulatory Capital Requirements (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081500 - Disclosure - Accumulated Other Comprehensive Loss (Tables)", "role": "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossTables", "shortName": "Accumulated Other Comprehensive Loss (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndDueFromBanks", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "030000 - Statement - Consolidated Statements of Condition", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "shortName": "Consolidated Statements of Condition", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndDueFromBanks", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081600 - Disclosure - Revenue from Contracts with Customers (Tables)", "role": "http://trustcobank.com/role/RevenueFromContractsWithCustomersTables", "shortName": "Revenue from Contracts with Customers (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081700 - Disclosure - Operating leases (Tables)", "role": "http://trustcobank.com/role/OperatingLeasesTables", "shortName": "Operating leases (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "srt:CondensedStatementOfComprehensiveIncomeTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "081900 - Disclosure - Parent Company Only (Tables)", "role": "http://trustcobank.com/role/ParentCompanyOnlyTables", "shortName": "Parent Company Only (Tables)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "srt:CondensedStatementOfComprehensiveIncomeTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "INF", "first": true, "lang": null, "name": "trst:NumberOfPastDuePaymentsForLoansClassifiedAsNonperforming", "reportCount": 1, "unique": true, "unitRef": "U004", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090100 - Disclosure - Basis of Presentation (Details)", "role": "http://trustcobank.com/role/BasisOfPresentationDetails", "shortName": "Basis of Presentation (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "INF", "first": true, "lang": null, "name": "trst:NumberOfPastDuePaymentsForLoansClassifiedAsNonperforming", "reportCount": 1, "unique": true, "unitRef": "U004", "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:FederalReserveBankReserveRequirement", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090200 - Disclosure - Balances at Other Banks (Details)", "role": "http://trustcobank.com/role/BalancesAtOtherBanksDetails", "shortName": "Balances at Other Banks (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:FederalReserveBankReserveRequirement", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090300 - Disclosure - Investment Securities, Available-for-sale Securities, Amortized Cost and Fair Value (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "shortName": "Investment Securities, Available-for-sale Securities, Amortized Cost and Fair Value (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090302 - Disclosure - Investment Securities, Available-for-sale Securities, Maturities (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails", "shortName": "Investment Securities, Available-for-sale Securities, Maturities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090304 - Disclosure - Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "shortName": "Investment Securities, Available-for-sale Securities, Gross Unrealized Loss Position (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:ProceedsFromCallsPaydownsOfAvailableForSaleSecurities", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090306 - Disclosure - Investment Securities, Available-for-sale Securities, Transaction Information (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails", "shortName": "Investment Securities, Available-for-sale Securities, Transaction Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:ProceedsFromCallsPaydownsOfAvailableForSaleSecurities", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:HeldToMaturitySecurities", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090308 - Disclosure - Investment Securities, Held-to-maturity Securities, Amortized Cost and Fair Value (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "shortName": "Investment Securities, Held-to-maturity Securities, Amortized Cost and Fair Value (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "lang": null, "name": "us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:HeldToMaturitySecuritiesFairValue", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "030100 - Statement - Consolidated Statements of Condition (Parenthetical)", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical", "shortName": "Consolidated Statements of Condition (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "0", "lang": null, "name": "us-gaap:CommonStockParOrStatedValuePerShare", "reportCount": 1, "unique": true, "unitRef": "U003", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:HeldToMaturitySecurities", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090310 - Disclosure - Investment Securities, Held-to-maturity Securities, Maturity (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails", "shortName": "Investment Securities, Held-to-maturity Securities, Maturity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-6", "lang": null, "name": "us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_ConcentrationRiskByBenchmarkAxis_StockholdersEquityTotalMember_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis_FederalNationalMortgageAssociationMember", "decimals": "-3", "first": true, "lang": null, "name": "trst:AmortizedCostBasis", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090312 - Disclosure - Investment Securities, Concentrations (Details)", "role": "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails", "shortName": "Investment Securities, Concentrations (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_ConcentrationRiskByBenchmarkAxis_StockholdersEquityTotalMember_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis_FederalNationalMortgageAssociationMember", "decimals": "-3", "first": true, "lang": null, "name": "trst:AmortizedCostBasis", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090400 - Disclosure - Loans and Allowance for Loan Losses, Recorded Investment in Loans (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "shortName": "Loans and Allowance for Loan Losses, Recorded Investment in Loans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-5", "lang": null, "name": "us-gaap:DueFromOfficersOrStockholders", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R53": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090402 - Disclosure - Loans and Allowance for Loan Losses, Non-accrual Loans, by Loan Class (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "shortName": "Loans and Allowance for Loan Losses, Non-accrual Loans, by Loan Class (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R54": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentPastDue", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090404 - Disclosure - Loans and Allowance for Loan Losses, Past Due (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "shortName": "Loans and Allowance for Loan Losses, Past Due (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableRecordedInvestmentPastDue", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R55": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20181231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableAllowance", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090406 - Disclosure - Loans and Allowance for Loan Losses, Allowance for Loan Losses (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "shortName": "Loans and Allowance for Loan Losses, Allowance for Loan Losses (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "lang": null, "name": "us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R56": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090408 - Disclosure - Loans and Allowance for Loan Losses, Based on Impairment Review Method (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "shortName": "Loans and Allowance for Loan Losses, Based on Impairment Review Method (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R57": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ImpairedFinancingReceivableRecordedInvestment", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090410 - Disclosure - Loans and Allowance for Loan Losses, Impaired Receivables (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "shortName": "Loans and Allowance for Loan Losses, Impaired Receivables (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "lang": null, "name": "us-gaap:ImpairedFinancingReceivableUnpaidPrincipalBalance", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R58": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:TdrSClassificationsFromPreviouslyPerformingLoans", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090412 - Disclosure - Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails", "shortName": "Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:TdrSClassificationsFromPreviouslyPerformingLoans", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R59": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:DeferralPeriodOfPastDueLoans", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090414 - Disclosure - Loans and Allowance for Loan Losses, Modified Loans Payment Status (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "shortName": "Loans and Allowance for Loan Losses, Modified Loans Payment Status (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "trst:DeferralPeriodOfPastDueLoans", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20161231_StatementEquityComponentsAxis_CommonStockMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquity", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "040000 - Statement - Consolidated Statements of Changes in Shareholders' Equity", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity", "shortName": "Consolidated Statements of Changes in Shareholders' Equity", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20161231_StatementEquityComponentsAxis_CommonStockMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquity", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R60": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LoansAndLeasesReceivableGrossCarryingAmount", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090416 - Disclosure - Loans and Allowance for Loan Losses, Risk Category of Loans (Details)", "role": "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "shortName": "Loans and Allowance for Loan Losses, Risk Category of Loans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "lang": null, "name": "trst:ImpairedLoansIncludedInClassifiedLoans", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R61": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090500 - Disclosure - Bank Premises and Equipment (Details)", "role": "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "shortName": "Bank Premises and Equipment (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R62": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090600 - Disclosure - Deposits (Details)", "role": "http://trustcobank.com/role/DepositsDetails", "shortName": "Deposits (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R63": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ShortTermBorrowings", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090700 - Disclosure - Short-Term Borrowings (Details)", "role": "http://trustcobank.com/role/ShorttermBorrowingsDetails", "shortName": "Short-Term Borrowings (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "us-gaap:ShortTermBorrowings", "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis_FederalHomeLoanBankOfNewYorkMember", "decimals": "-3", "lang": null, "name": "us-gaap:ShortTermBorrowings", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R64": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CurrentFederalTaxExpenseBenefit", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090800 - Disclosure - Income Taxes (Details)", "role": "http://trustcobank.com/role/IncomeTaxesDetails", "shortName": "Income Taxes (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CurrentFederalTaxExpenseBenefit", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R65": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": null, "first": true, "lang": "en-US", "name": "trst:DefinedBenefitPlanEligibilityRequirementPeriodOfEmploymentMinimum", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090900 - Disclosure - Benefit Plans, Change in Projected Benefit Obligation, Plan Assets and Funded Status Reconciliation (Details)", "role": "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "shortName": "Benefit Plans, Change in Projected Benefit Obligation, Plan Assets and Funded Status Reconciliation (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": null, "first": true, "lang": "en-US", "name": "trst:DefinedBenefitPlanEligibilityRequirementPeriodOfEmploymentMinimum", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R66": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090902 - Disclosure - Benefit Plans, Plan Disclosures (Details)", "role": "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "shortName": "Benefit Plans, Plan Disclosures (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "-3", "lang": null, "name": "us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R67": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090904 - Disclosure - Benefit Plans, Estimated Future Benefit Payments, Assumptions and Change in Obligation (Details)", "role": "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "shortName": "Benefit Plans, Estimated Future Benefit Payments, Assumptions and Change in Obligation (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R68": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:OtherComprehensiveIncomeLossDefinedBenefitPlanChangeInOverfundedPositionBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090906 - Disclosure - Benefit Plans, Health Care Cost Trend Rate and Other Comprehensive Income Disclosures (Details)", "role": "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "shortName": "Benefit Plans, Health Care Cost Trend Rate and Other Comprehensive Income Disclosures (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:OtherComprehensiveIncomeLossDefinedBenefitPlanChangeInOverfundedPositionBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R69": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations", "reportCount": 1, "unique": true, "unitRef": "U005", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090908 - Disclosure - Benefit Plans, Allocation of Plan Assets (Details)", "role": "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "shortName": "Benefit Plans, Allocation of Plan Assets (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations", "reportCount": 1, "unique": true, "unitRef": "U005", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:CommonStockDividendsPerShareDeclared", "reportCount": 1, "unique": true, "unitRef": "U003", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "040100 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical", "shortName": "Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:CommonStockDividendsPerShareDeclared", "reportCount": 1, "unique": true, "unitRef": "U003", "xsiNil": "false" } }, "R70": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanFairValueOfPlanAssets", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090910 - Disclosure - Benefit Plans, Fair Value of Plan Assets (Details)", "role": "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "shortName": "Benefit Plans, Fair Value of Plan Assets (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel1Member_RetirementPlanTypeAxis_PensionPlansDefinedBenefitMember", "decimals": "-3", "lang": null, "name": "us-gaap:DefinedBenefitPlanFairValueOfPlanAssets", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R71": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:PerformanceBonusUnitsAwardsRelatedToChangeOfControl", "reportCount": 1, "unique": true, "unitRef": "U002", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090912 - Disclosure - Benefit Plans, Incentive and Bonus Plans (Details)", "role": "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails", "shortName": "Benefit Plans, Incentive and Bonus Plans (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-5", "first": true, "lang": null, "name": "trst:PerformanceBonusUnitsAwardsRelatedToChangeOfControl", "reportCount": 1, "unique": true, "unitRef": "U002", "xsiNil": "false" } }, "R72": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensation", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090914 - Disclosure - Benefit Plans, Stock Based Compensation Plans - Equity Awards (Details)", "role": "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "shortName": "Benefit Plans, Stock Based Compensation Plans - Equity Awards (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_AwardTypeAxis_EmployeeStockOptionMember", "decimals": "INF", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod", "reportCount": 1, "unique": true, "unitRef": "U002", "xsiNil": "false" } }, "R73": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensation", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "090916 - Disclosure - Benefit Plans, Valuation, Stock-Based Compensation (Details)", "role": "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails", "shortName": "Benefit Plans, Valuation, Stock-Based Compensation (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_AwardTypeAxis_EmployeeStockOptionMember", "decimals": "-3", "lang": null, "name": "us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R74": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:OutsourcedServices", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091000 - Disclosure - Commitments and Contingent Liabilities (Details)", "role": "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "shortName": "Commitments and Contingent Liabilities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_ThirdPartyServiceAgreementMember_RangeAxis_MinimumMember", "decimals": "-6", "lang": null, "name": "us-gaap:LongTermPurchaseCommitmentAmount", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R75": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091100 - Disclosure - Earnings Per Share (Details)", "role": "http://trustcobank.com/role/EarningsPerShareDetails", "shortName": "Earnings Per Share (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "lang": null, "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic", "reportCount": 1, "unique": true, "unitRef": "U002", "xsiNil": "false" } }, "R76": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_FinancialInstrumentAxis_CommitmentsToExtendCreditMember", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091200 - Disclosure - Off-Balance Sheet Financial Instruments (Details)", "role": "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails", "shortName": "Off-Balance Sheet Financial Instruments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_FinancialInstrumentAxis_CommitmentsToExtendCreditMember", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R77": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091300 - Disclosure - Fair Value, Assets and Liabilities Measured at Fair Value Recurring Basis (Details)", "role": "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "shortName": "Fair Value, Assets and Liabilities Measured at Fair Value Recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel1Member_FairValueByMeasurementFrequencyAxis_FairValueMeasurementsRecurringMember", "decimals": "-3", "lang": null, "name": "trst:USGovernmentSponsoredEnterprisesFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R78": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueAssetsLevel1ToLevel2TransfersAmount", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091302 - Disclosure - Fair Value, Assets Measured at Fair Value Non-recurring (Details)", "role": "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "shortName": "Fair Value, Assets Measured at Fair Value Non-recurring (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueAssetsLevel1ToLevel2TransfersAmount", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R79": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091304 - Disclosure - Fair Value, Carrying Amounts and Estimated Fair Values of Financial Instruments (Details)", "role": "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails", "shortName": "Fair Value, Carrying Amounts and Estimated Fair Values of Financial Instruments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "lang": null, "name": "trst:DebtSecuritiesHeldToMaturityFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "050000 - Statement - Consolidated Statements of Cash Flows", "role": "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "shortName": "Consolidated Statements of Cash Flows", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "lang": null, "name": "us-gaap:DepreciationAmortizationAndAccretionNet", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R80": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_ConsolidatedEntitiesAxis_SubsidiariesMember", "decimals": "INF", "first": true, "lang": null, "name": "trst:NumberOfClassificationsForPromptCorrectiveActionRegulationsProvides", "reportCount": 1, "unique": true, "unitRef": "U009", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091400 - Disclosure - Regulatory Capital Requirements (Details)", "role": "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails", "shortName": "Regulatory Capital Requirements (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_ConsolidatedEntitiesAxis_SubsidiariesMember", "decimals": "INF", "first": true, "lang": null, "name": "trst:NumberOfClassificationsForPromptCorrectiveActionRegulationsProvides", "reportCount": 1, "unique": true, "unitRef": "U009", "xsiNil": "false" } }, "R81": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20181231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquity", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091500 - Disclosure - Accumulated Other Comprehensive Loss (Details)", "role": "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "shortName": "Accumulated Other Comprehensive Loss (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "lang": null, "name": "us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R82": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LaborAndRelatedExpense", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091502 - Disclosure - Accumulated Other Comprehensive Loss, Reclassifications out of Accumulated Other Comprehensive Loss (Details)", "role": "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "shortName": "Accumulated Other Comprehensive Loss, Reclassifications out of Accumulated Other Comprehensive Loss (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember", "decimals": "-3", "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R83": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:OtherNonInterestIncome", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091600 - Disclosure - Revenue from Contracts with Customers (Details)", "role": "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails", "shortName": "Revenue from Contracts with Customers (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "trst:OtherNonInterestIncome", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R84": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OperatingLeaseCost", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091700 - Disclosure - Operating leases (Details)", "role": "http://trustcobank.com/role/OperatingLeasesDetails", "shortName": "Operating leases (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OperatingLeaseCost", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R85": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091800 - Disclosure - Recent Accounting Pronouncements (Details)", "role": "http://trustcobank.com/role/RecentAccountingPronouncementsDetails", "shortName": "Recent Accounting Pronouncements (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20181231_AdjustmentsForNewAccountingPronouncementsAxis_AccountingStandardsUpdate201602Member", "decimals": "-5", "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R86": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfessionalFees", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091900 - Disclosure - Parent Company Only, Statements of Comprehensive Income (Details)", "role": "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails", "shortName": "Parent Company Only, Statements of Comprehensive Income (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_ConsolidatedEntitiesAxis_ParentCompanyMember", "decimals": "-3", "lang": null, "name": "trst:CashInterestAndDividendsPaidToParentCompany", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R87": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091902 - Disclosure - Parent Company Only, Statements of Condition (Details)", "role": "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails", "shortName": "Parent Company Only, Statements of Condition (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20191231_ConsolidatedEntitiesAxis_ParentCompanyMember", "decimals": "-3", "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R88": { "firstAnchor": { "ancestors": [ "div", "td", "tr", "table", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U001", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "091904 - Disclosure - Parent Company Only, Statements of Cash Flows (Details)", "role": "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "shortName": "Parent Company Only, Statements of Cash Flows (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "div", "td", "tr", "table", "ix:continuation", "ix:continuation", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231_ConsolidatedEntitiesAxis_ParentCompanyMember", "decimals": "-3", "lang": null, "name": "us-gaap:ShareBasedCompensation", "reportCount": 1, "unique": true, "unitRef": "U001", "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "060100 - Disclosure - Basis of Presentation", "role": "http://trustcobank.com/role/BasisOfPresentation", "shortName": "Basis of Presentation", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "div", "body", "html" ], "baseRef": "ex13.htm", "contextRef": "c20190101to20191231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } } }, "segmentCount": 98, "tag": { "dei_AmendmentFlag": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.", "label": "Amendment Flag" } } }, "localname": "AmendmentFlag", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_CityAreaCode": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Area code of city", "label": "City Area Code" } } }, "localname": "CityAreaCode", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_CoverAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Cover page.", "label": "Cover [Abstract]" } } }, "localname": "CoverAbstract", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "xbrltype": "stringItemType" }, "dei_CurrentFiscalYearEndDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "End date of current fiscal year in the format --MM-DD.", "label": "Current Fiscal Year End Date" } } }, "localname": "CurrentFiscalYearEndDate", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "gMonthDayItemType" }, "dei_DocumentAnnualReport": { "auth_ref": [ "r521" ], "lang": { "en-US": { "role": { "documentation": "Boolean flag that is true only for a form used as an annual report.", "label": "Document Annual Report" } } }, "localname": "DocumentAnnualReport", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentFiscalPeriodFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Fiscal period values are FY, Q1, Q2, and Q3. 1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.", "label": "Document Fiscal Period Focus" } } }, "localname": "DocumentFiscalPeriodFocus", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "fiscalPeriodItemType" }, "dei_DocumentFiscalYearFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.", "label": "Document Fiscal Year Focus" } } }, "localname": "DocumentFiscalYearFocus", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "gYearItemType" }, "dei_DocumentPeriodEndDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.", "label": "Document Period End Date" } } }, "localname": "DocumentPeriodEndDate", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "dei_DocumentTransitionReport": { "auth_ref": [ "r520" ], "lang": { "en-US": { "role": { "documentation": "Boolean flag that is true only for a form used as a transition report.", "label": "Document Transition Report" } } }, "localname": "DocumentTransitionReport", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentType": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.", "label": "Document Type" } } }, "localname": "DocumentType", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_EntityAddressAddressLine1": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Address Line 1 such as Attn, Building Name, Street Name", "label": "Entity Address, Address Line One" } } }, "localname": "EntityAddressAddressLine1", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressCityOrTown": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of the City or Town", "label": "Entity Address, City or Town" } } }, "localname": "EntityAddressCityOrTown", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressPostalZipCode": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Code for the postal or zip code", "label": "Entity Address, Postal Zip Code" } } }, "localname": "EntityAddressPostalZipCode", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressStateOrProvince": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of the state or province.", "label": "Entity Address, State or Province" } } }, "localname": "EntityAddressStateOrProvince", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "stateOrProvinceItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.", "label": "Entity Central Index Key" } } }, "localname": "EntityCentralIndexKey", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "centralIndexKeyItemType" }, "dei_EntityCommonStockSharesOutstanding": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.", "label": "Entity Common Stock, Shares Outstanding" } } }, "localname": "EntityCommonStockSharesOutstanding", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "sharesItemType" }, "dei_EntityCurrentReportingStatus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Current Reporting Status" } } }, "localname": "EntityCurrentReportingStatus", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "Indicate if registrant meets the emerging growth company criteria.", "label": "Entity Emerging Growth Company" } } }, "localname": "EntityEmergingGrowthCompany", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityFileNumber": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.", "label": "Entity File Number" } } }, "localname": "EntityFileNumber", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Filer Category" } } }, "localname": "EntityFilerCategory", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "filerCategoryItemType" }, "dei_EntityIncorporationStateCountryCode": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Two-character EDGAR code representing the state or country of incorporation.", "label": "Entity Incorporation, State or Country Code" } } }, "localname": "EntityIncorporationStateCountryCode", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "edgarStateCountryItemType" }, "dei_EntityInteractiveDataCurrent": { "auth_ref": [ "r523" ], "lang": { "en-US": { "role": { "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).", "label": "Entity Interactive Data Current" } } }, "localname": "EntityInteractiveDataCurrent", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityPublicFloat": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.", "label": "Entity Public Float" } } }, "localname": "EntityPublicFloat", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "monetaryItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.", "label": "Entity Registrant Name" } } }, "localname": "EntityRegistrantName", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.", "label": "Entity Shell Company" } } }, "localname": "EntityShellCompany", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).", "label": "Entity Small Business" } } }, "localname": "EntitySmallBusiness", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r522" ], "lang": { "en-US": { "role": { "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.", "label": "Entity Tax Identification Number" } } }, "localname": "EntityTaxIdentificationNumber", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "employerIdItemType" }, "dei_EntityVoluntaryFilers": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.", "label": "Entity Voluntary Filers" } } }, "localname": "EntityVoluntaryFilers", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityWellKnownSeasonedIssuer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.", "label": "Entity Well-known Seasoned Issuer" } } }, "localname": "EntityWellKnownSeasonedIssuer", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_LocalPhoneNumber": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Local phone number for entity.", "label": "Local Phone Number" } } }, "localname": "LocalPhoneNumber", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_Security12bTitle": { "auth_ref": [ "r518" ], "lang": { "en-US": { "role": { "documentation": "Title of a 12(b) registered security.", "label": "Title of 12(b) Security" } } }, "localname": "Security12bTitle", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "securityTitleItemType" }, "dei_SecurityExchangeName": { "auth_ref": [ "r519" ], "lang": { "en-US": { "role": { "documentation": "Name of the Exchange on which a security is registered.", "label": "Security Exchange Name" } } }, "localname": "SecurityExchangeName", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "edgarExchangeCodeItemType" }, "dei_TradingSymbol": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Trading symbol of an instrument as listed on an exchange.", "label": "Trading Symbol" } } }, "localname": "TradingSymbol", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://trustcobank.com/role/DocumentAndEntityInformation" ], "xbrltype": "tradingSymbolItemType" }, "srt_CondensedBalanceSheetStatementTable": { "auth_ref": [ "r99", "r371", "r527" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations.", "label": "Condensed Balance Sheet Statement [Table]" } } }, "localname": "CondensedBalanceSheetStatementTable", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedBalanceSheetStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Balance Sheet Statements, Captions [Line Items]" } } }, "localname": "CondensedBalanceSheetStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedCashFlowStatementTable": { "auth_ref": [ "r99", "r371", "r528" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations.", "label": "Condensed Cash Flow Statement [Table]" } } }, "localname": "CondensedCashFlowStatementTable", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedCashFlowStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Cash Flow Statements, Captions [Line Items]" } } }, "localname": "CondensedCashFlowStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Parent Company Only [Abstract]" } } }, "localname": "CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract", "nsuri": "http://fasb.org/srt/2019-01-31", "xbrltype": "stringItemType" }, "srt_CondensedIncomeStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Income Statements, Captions [Line Items]" } } }, "localname": "CondensedIncomeStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedStatementOfComprehensiveIncomeTable": { "auth_ref": [ "r99", "r371", "r527" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed statement of comprehensive income (loss) including, but not limited to, statements of comprehensive income (loss) of consolidated entities and consolidation eliminations.", "label": "Condensed Statement of Comprehensive Income [Table]" } } }, "localname": "CondensedStatementOfComprehensiveIncomeTable", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedStatementOfComprehensiveIncomeTableTextBlock": { "auth_ref": [ "r529" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed statement of comprehensive income (loss) including, but not limited to, statements of comprehensive income (loss) of consolidated entities and consolidation eliminations.", "label": "Statements of Comprehensive Income" } } }, "localname": "CondensedStatementOfComprehensiveIncomeTableTextBlock", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyTables" ], "xbrltype": "textBlockItemType" }, "srt_ConsolidatedEntitiesAxis": { "auth_ref": [ "r517", "r525" ], "lang": { "en-US": { "role": { "documentation": "Information by consolidated entity or group of entities.", "label": "Consolidated Entities [Axis]" } } }, "localname": "ConsolidatedEntitiesAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails", "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "srt_ConsolidatedEntitiesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Entity or group of entities consolidated into reporting entity.", "label": "Consolidated Entities [Domain]" } } }, "localname": "ConsolidatedEntitiesDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails", "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "domainItemType" }, "srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis": { "auth_ref": [ "r473" ], "lang": { "en-US": { "role": { "documentation": "Information by branch of Federal Home Loan Bank.", "label": "Federal Home Loan Bank Branch [Axis]" } } }, "localname": "FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails", "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "stringItemType" }, "srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankStateDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Twelve regional cooperative banks that U.S. lending institutions use to finance housing and economic development in their communities.", "label": "Federal Home Loan Bank Branch [Domain]" } } }, "localname": "FederalHomeLoanBankAdvancesBranchOfFHLBBankStateDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails", "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "domainItemType" }, "srt_FederalHomeLoanBankOfNewYorkMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Federal Home Loan Bank (FHLBank) located in New York, New York.", "label": "Federal Home Loan Bank of New York [Member]" } } }, "localname": "FederalHomeLoanBankOfNewYorkMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "domainItemType" }, "srt_MaximumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Upper limit of the provided range.", "label": "Maximum [Member]" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails", "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/IncomeTaxesDetails", "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lower limit of the provided range.", "label": "Minimum [Member]" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails", "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/IncomeTaxesDetails", "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "domainItemType" }, "srt_ParentCompanyMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The registrant that controls, directly or indirectly, another entity (or entities). The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree.", "label": "TrustCo Bank Corp NY [Member]" } } }, "localname": "ParentCompanyMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails", "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "domainItemType" }, "srt_ProductOrServiceAxis": { "auth_ref": [ "r139", "r257", "r258", "r498", "r499" ], "lang": { "en-US": { "role": { "documentation": "Information by product and service, or group of similar products and similar services.", "label": "Products and Services [Axis]" } } }, "localname": "ProductOrServiceAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "stringItemType" }, "srt_ProductsAndServicesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Product or service, or a group of similar products or similar services.", "label": "Products and Services [Domain]" } } }, "localname": "ProductsAndServicesDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.", "label": "Statistical Measurement [Axis]" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails", "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/IncomeTaxesDetails", "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.", "label": "Statistical Measurement [Domain]" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails", "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/IncomeTaxesDetails", "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "domainItemType" }, "srt_RegulatoryCapitalRequirementsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Regulatory Capital Requirements [Abstract]" } } }, "localname": "RegulatoryCapitalRequirementsAbstract", "nsuri": "http://fasb.org/srt/2019-01-31", "xbrltype": "stringItemType" }, "srt_RestatementAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by revision of previously issued financial statements.", "label": "Restatement [Axis]" } } }, "localname": "RestatementAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "srt_RestatementDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revision of previously issued financial statements.", "label": "Restatement [Domain]" } } }, "localname": "RestatementDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioPreviouslyReportedMember": { "auth_ref": [ "r105", "r106", "r107" ], "lang": { "en-US": { "role": { "documentation": "Represents the amount as previously reported before the correction of an error or other adjustment.", "label": "Previously Reported [Member]" } } }, "localname": "ScenarioPreviouslyReportedMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "srt_ScheduleOfCondensedBalanceSheetTableTextBlock": { "auth_ref": [ "r529" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations.", "label": "Statements of Condition" } } }, "localname": "ScheduleOfCondensedBalanceSheetTableTextBlock", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyTables" ], "xbrltype": "textBlockItemType" }, "srt_ScheduleOfCondensedCashFlowStatementTableTextBlock": { "auth_ref": [ "r529" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations.", "label": "Statements of Cash Flows" } } }, "localname": "ScheduleOfCondensedCashFlowStatementTableTextBlock", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyTables" ], "xbrltype": "textBlockItemType" }, "srt_SegmentGeographicalDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Geographical area.", "label": "Geographical [Domain]", "terseLabel": "Geographical [Domain]" } } }, "localname": "SegmentGeographicalDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "srt_StatementGeographicalAxis": { "auth_ref": [ "r140", "r257", "r259", "r500", "r514", "r516", "r524", "r526" ], "lang": { "en-US": { "role": { "documentation": "Information by geographical components.", "label": "Geographical [Axis]", "terseLabel": "Geographical [Axis]" } } }, "localname": "StatementGeographicalAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "srt_SubsidiariesMember": { "auth_ref": [ "r295", "r425", "r427" ], "lang": { "en-US": { "role": { "documentation": "Entity owned or controlled by another entity.", "label": "Trustco Bank [Member]" } } }, "localname": "SubsidiariesMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "domainItemType" }, "srt_WeightedAverageMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Average of a range of values, calculated with consideration of proportional relevance.", "label": "Weighted Average [Member]" } } }, "localname": "WeightedAverageMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "stpr_FL": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "FLORIDA", "terseLabel": "Florida [Member]" } } }, "localname": "FL", "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "trst_AgeAtWhichCompanyProvidesAccessToMedicareSupplementalProgramForRetirees": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The age of retirees that the company provides access to Medicare Supplemental program.", "label": "Age at which company provides access to Medicare Supplemental program for retirees", "terseLabel": "Age at which company provides access to Medicare Supplemental program for retirees" } } }, "localname": "AgeAtWhichCompanyProvidesAccessToMedicareSupplementalProgramForRetirees", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "durationItemType" }, "trst_AggregateSalaryContributionMatchedByHalfByEmployer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage of employee's compensation that is matched by half, by the employer.", "label": "Aggregate salary contribution matched by half by employer", "terseLabel": "Aggregate salary contribution matched by employer, next match" } } }, "localname": "AggregateSalaryContributionMatchedByHalfByEmployer", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "percentItemType" }, "trst_AllowanceForCreditLossesOnFinancingReceivablesBasedOnImpairmentMethodTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) based on impairment method.", "label": "Allowance for credit losses on financing receivables based on impairment method [Table Text Block]", "verboseLabel": "Allowance For Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method" } } }, "localname": "AllowanceForCreditLossesOnFinancingReceivablesBasedOnImpairmentMethodTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "trst_AllowanceForLoanLossesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Allowance for Loan Losses [Abstract]" } } }, "localname": "AllowanceForLoanLossesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "trst_AllowanceForLoanLossesAndRecordedInvestmentInLoansBasedOnImpairmentMethodAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Allowance for loan losses and recorded investment in loans based on impairment method [Abstract]", "terseLabel": "Allowance for loan losses and the recorded investment in loans based on impairment method [Abstract]" } } }, "localname": "AllowanceForLoanLossesAndRecordedInvestmentInLoansBasedOnImpairmentMethodAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "trst_AllowanceForLoanLossesBasedOnImpairmentMethodAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Allowance for loan losses based on impairment method [Abstract]", "verboseLabel": "Allowance for loan losses [Abstract]" } } }, "localname": "AllowanceForLoanLossesBasedOnImpairmentMethodAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "trst_AmortizedCostBasis": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This item represents the cost of debt and equity securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.", "label": "Amortized Cost Basis", "verboseLabel": "Amortized cost" } } }, "localname": "AmortizedCostBasis", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "monetaryItemType" }, "trst_AmountIncludedInTimeDepositsWithBalanceIn250000OrMore": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more.", "label": "Amount Included in time deposits with balance in 250000 or more", "terseLabel": "Amount included in time deposits with balance in excess of $250,000" } } }, "localname": "AmountIncludedInTimeDepositsWithBalanceIn250000OrMore", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "trst_AntidilutiveSecuritiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Antidilutive Securities [Abstract]" } } }, "localname": "AntidilutiveSecuritiesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "stringItemType" }, "trst_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Available-for-sale Securities, Continuous Unrealized Loss Positions [Abstract]", "terseLabel": "Unrealized losses on investment securities available for sale and the related fair values aggregated by the length of time [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "stringItemType" }, "trst_BenefitPaymentsAndActualExpenses": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of payments made for which participants are entitled under a pension plan, including benefit payments and actual expenses.", "label": "Benefit payments and actual expenses", "negatedLabel": "Benefit payments and actual expenses" } } }, "localname": "BenefitPaymentsAndActualExpenses", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "trst_BenefitPaymentsAndExpectedExpenses": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of payments made for which participants are entitled under a pension plan, including benefit payments and expected expenses.", "label": "Benefit payments and expected expenses", "negatedLabel": "Benefit payments and expected expenses" } } }, "localname": "BenefitPaymentsAndExpectedExpenses", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "trst_CashInterestAndDividendsPaidToParentCompany": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 1.0, "parentTag": "us-gaap_Revenues", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents disclosure of the total aggregate cash dividends and interest paid to the entity by consolidated subsidiaries.", "label": "Cash Interest And Dividends Paid To Parent Company", "terseLabel": "Dividends and interest from subsidiaries" } } }, "localname": "CashInterestAndDividendsPaidToParentCompany", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "trst_CashManagementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Cash management accounts are retail deposit sweep accounts which are secured by collateral because they exceed FDIC insurance limits.", "label": "Cash Management [Member]" } } }, "localname": "CashManagementMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "domainItemType" }, "trst_CashPaidDuringYearForAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash paid during the year for: [Abstract]", "verboseLabel": "Cash paid during the year for:" } } }, "localname": "CashPaidDuringYearForAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "trst_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash Paid for Amounts Included in the Measurement of Lease Liabilities [Abstract]", "terseLabel": "Cash paid for amounts included in the measurement of lease liabilities [Abstract]" } } }, "localname": "CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "trst_ChangeInAccumulatedBenefitObligationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Change in Accumulated Benefit Obligation: [Abstract]", "terseLabel": "Change in benefit obligation [Rollforward]" } } }, "localname": "ChangeInAccumulatedBenefitObligationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "trst_ChangeInBenefitObligationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Change In Benefit Obligation [Abstract]", "terseLabel": "Change in benefit obligation [Abstract]" } } }, "localname": "ChangeInBenefitObligationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "trst_ChangeInComponentOfOtherComprehensiveIncomeRelatedToRetirementPlanAndPostRetirementBenefitPlanTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of changes in the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.", "label": "Change in component of other comprehensive income related to retirement plan and post retirement benefit plan [Table Text Block]", "verboseLabel": "Change in Component of Other Comprehensive (Loss) income Related to Retirement Plan and Post-retirement Benefit Plan" } } }, "localname": "ChangeInComponentOfOtherComprehensiveIncomeRelatedToRetirementPlanAndPostRetirementBenefitPlanTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "trst_ChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715Net": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net of tax amount of the change in the overfunded portion of pension and post retirement benefit plans as adopted under ASC 715.", "label": "Change In Overfunded Portion Of Pension And Post Retirement Benefit Plans Asc715 Net", "negatedTotalLabel": "Change in overfunded position in pension and postretirement plans arising during the year, net of tax" } } }, "localname": "ChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715Net", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "trst_ChangeInOverfundedPositionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Net change in overfunded position in pension and postretirement plans arising during the year, net of tax.", "label": "Change in overfunded position [Member]", "verboseLabel": "Net Change in Overfunded Position in Pension and Postretirement Plans Arising During the Year, Net of Tax [Member]" } } }, "localname": "ChangeInOverfundedPositionMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "trst_ChangesInAccountingPrinciplesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Changes in Accounting Principles [Abstract]" } } }, "localname": "ChangesInAccountingPrinciplesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "stringItemType" }, "trst_ClassifiedMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A category of financing receivables considered as special mention, substandard and doubtful loans.", "label": "Classified [Member]" } } }, "localname": "ClassifiedMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "domainItemType" }, "trst_CollateralDependentImpairedFinancingReceivableRecordedInvestment": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses which are collateral dependent at period end.", "label": "Collateral Dependent Impaired Financing Receivable Recorded Investment", "terseLabel": "Collateral dependent impaired loans" } } }, "localname": "CollateralDependentImpairedFinancingReceivableRecordedInvestment", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "trst_CommercialBorrowersResidentialPurposesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Class of financing receivables related to real estate financing receivables for commercial borrowers of residential purposes.", "label": "Commercial Borrowers Residential Purposes [Member]", "verboseLabel": "Commercial Borrowers Residential Purpose [Member]" } } }, "localname": "CommercialBorrowersResidentialPurposesMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "domainItemType" }, "trst_CommercialOtherReceivableMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Portfolio segment of the company's total financing receivables related to commercial loans other than real estate financed loans.", "label": "Commercial Other Receivable [Member]", "terseLabel": "Other [Member]" } } }, "localname": "CommercialOtherReceivableMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "domainItemType" }, "trst_CommonEquityTier1CapitalAdequatelyCapitalized": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The Common equity Tier 1 capital ratio (Common equity capital divided by assets) required to be categorized as \"adequately capitalized\" under the regulatory framework for prompt corrective action.", "label": "Common Equity Tier 1 Capital, Adequately Capitalized", "terseLabel": "Common equity Tier 1 capital, minimum for capital adequacy plus capital conservation" } } }, "localname": "CommonEquityTier1CapitalAdequatelyCapitalized", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "trst_CommonEquityTier1CapitalWellCapitalized": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The Common equity Tier 1 capital (Common equity capital divided by assets) required to be categorized as \"well capitalized\" under the regulatory framework for prompt corrective action.", "label": "Common Equity Tier 1 Capital, Well Capitalized", "terseLabel": "Common equity Tier 1 capital, well capitalized" } } }, "localname": "CommonEquityTier1CapitalWellCapitalized", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "trst_CommonEquityTierOneCapitalConservationBuffer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Common equity Tier 1 capital conservation buffer of risk-weighted assets.", "label": "Common Equity Tier One Capital Conservation Buffer", "terseLabel": "Common equity Tier 1 capital conservation buffer" } } }, "localname": "CommonEquityTierOneCapitalConservationBuffer", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "trst_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Compliance With Regulatory Capital Requirements Under Banking Regulations Information [Abstract]" } } }, "localname": "ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsInformationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "trst_CorporateBondsFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 8.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Corporate bond securities.", "label": "Corporate Bonds Fair Value Disclosure", "terseLabel": "Corporate bonds" } } }, "localname": "CorporateBondsFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_DebtSecuritiesHeldToMaturityFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity).", "label": "Debt Securities, Held-to-maturity, Fair Value Disclosure", "verboseLabel": "Held to maturity securities" } } }, "localname": "DebtSecuritiesHeldToMaturityFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_DeferralPeriodOfPastDueLoans": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Deferral period of all past due loans in accordance with the bankruptcy court order.", "label": "Deferral period of past due loans", "verboseLabel": "Deferral period of chapter 13 bankruptcies" } } }, "localname": "DeferralPeriodOfPastDueLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "durationItemType" }, "trst_DeferredTaxAssetsTemporaryDifferencesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Deferred tax assets temporary differences [Abstract]", "terseLabel": "Deferred tax assets temporary differences [Abstract]" } } }, "localname": "DeferredTaxAssetsTemporaryDifferencesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "trst_DeferredTaxEffectOfChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 1.0, "parentTag": "trst_ChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715Net", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The tax effect of the change in the overfunded position of pension and post retirement benefit plans as adopted under ASC 715.", "label": "Deferred Tax Effect Of Change In Overfunded Portion Of Pension And Post Retirement Benefit Plans Asc715", "negatedLabel": "Tax effect", "negatedTerseLabel": "Deferred tax effect of change in overfunded portion of pension and post retirement benefit plans (ASC 715)" } } }, "localname": "DeferredTaxEffectOfChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "trst_DeferredTaxLiabilitiesUnrealizedLossesOnAvailableForSaleSecuritiesGross": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from unrealized losses on available-for-sale securities.", "label": "Deferred Tax Liabilities, Unrealized Losses on Available-for-Sale Securities, Gross", "terseLabel": "Deferred tax liabilities, unrealized losses on available-for-sale securities" } } }, "localname": "DeferredTaxLiabilitiesUnrealizedLossesOnAvailableForSaleSecuritiesGross", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "trst_DeferredTaxLiabilityTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax liability attributable to taxable temporary differences from postretirement benefits.", "label": "Deferred Tax Liability Tax Deferred Expense Compensation And Benefits Postretirement Benefits", "terseLabel": "Deferred tax liabilities, unrecognized overfunded position in company's pension and postretirement benefit plans" } } }, "localname": "DeferredTaxLiabilityTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "trst_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents defined benefit pension plans and defined benefit postretirement plans.", "label": "Defined Benefit Pension Plans and Defined Benefit Postretirement Plans [Member]", "terseLabel": "Pension and Postretirement Plans [Member]" } } }, "localname": "DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "trst_DefinedBenefitPlanBasisOfBenefitNumberOfConsecutiveYearsInHighestCompensation": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of the consecutive years in highest compensation preceding retirement, which forms part of the basis of the benefits.", "label": "Defined Benefit Plan, Basis of Benefit, Number of Consecutive Years in Highest Compensation", "terseLabel": "Number of consecutive years in highest compensation preceding retirement" } } }, "localname": "DefinedBenefitPlanBasisOfBenefitNumberOfConsecutiveYearsInHighestCompensation", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "durationItemType" }, "trst_DefinedBenefitPlanBasisOfBenefitPeriodPrecedingRetirement": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the period preceding retirement, the compensation during which forms the basis of the benefits of an individual.", "label": "Defined Benefit Plan, Basis of Benefit, Period Preceding Retirement", "terseLabel": "Period preceding retirement considered in calculating benefits" } } }, "localname": "DefinedBenefitPlanBasisOfBenefitPeriodPrecedingRetirement", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "durationItemType" }, "trst_DefinedBenefitPlanDisclosureInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Defined Benefit Plan Disclosure Information [Abstract]", "verboseLabel": "Defined benefit plan [Abstract]" } } }, "localname": "DefinedBenefitPlanDisclosureInformationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "stringItemType" }, "trst_DefinedBenefitPlanEligibilityRequirementHoursOfServiceMinimum": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The minimum hours of service that the individual is required to perform in order to be eligible for a defined benefit plan.", "label": "Defined Benefit Plan, Eligibility Requirement, Hours of Service, Minimum", "terseLabel": "Requisite minimum hours of service" } } }, "localname": "DefinedBenefitPlanEligibilityRequirementHoursOfServiceMinimum", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "integerItemType" }, "trst_DefinedBenefitPlanEligibilityRequirementPeriodOfEmploymentMinimum": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The minimum period that the individual is required to perform services in order to be eligible for a defined benefit plan.", "label": "Defined Benefit Plan, Eligibility Requirement, Period of Employment, Minimum", "terseLabel": "Requisite minimum period of employment" } } }, "localname": "DefinedBenefitPlanEligibilityRequirementPeriodOfEmploymentMinimum", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "durationItemType" }, "trst_DemandDepositAccountsFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.", "label": "Demand Deposit Accounts Fair Value Disclosure", "verboseLabel": "Demand deposits" } } }, "localname": "DemandDepositAccountsFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_DirectorsStockOptionPlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity-based arrangement under which compensation is awarded to employees and directors.", "label": "2010 Directors Stock Option Plan [Member]" } } }, "localname": "DirectorsStockOptionPlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "trst_DividendRestrictionsPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of regulatory dividend restrictions affecting the Company and its subsidiaries.", "label": "Dividend Restrictions [Policy Text Block]", "terseLabel": "Dividend Restrictions" } } }, "localname": "DividendRestrictionsPolicyTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "trst_DividendsIncomeFederalReserveBankAndFederalHomeLoanBankStock": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 4.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Dividends income on Federal Reserve Bank and Federal Home Loan Bank stock.", "label": "Dividends income Federal Reserve Bank and Federal Home Loan Bank stock", "verboseLabel": "Federal Reserve Bank and Federal Home Loan Bank stock" } } }, "localname": "DividendsIncomeFederalReserveBankAndFederalHomeLoanBankStock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_EmployerMatchingContributionHalfMatched": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage of employee's compensation that is matched in half.", "label": "Employer matching contribution, half matched", "terseLabel": "Employer matching contribution, next matched" } } }, "localname": "EmployerMatchingContributionHalfMatched", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "percentItemType" }, "trst_EmployerMatchingContributionToFirstThreePercentOfCompensation": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The matching contribution that the employer will make to the first three percent of employee's compensation.", "label": "Employer matching contribution to first three percent of compensation", "terseLabel": "Employer matching contribution, first match" } } }, "localname": "EmployerMatchingContributionToFirstThreePercentOfCompensation", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "percentItemType" }, "trst_EndingAllowanceBalanceAttributableToLoansAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Ending allowance balance attributable to loans [Abstract]" } } }, "localname": "EndingAllowanceBalanceAttributableToLoansAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "trst_ExecutiveIncentivePlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity-based arrangement under which compensation is awarded to employees and directors.", "label": "Executive incentive plan [Member]", "terseLabel": "Executive Incentive Plan [Member]" } } }, "localname": "ExecutiveIncentivePlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "domainItemType" }, "trst_ExpectedPercentageOfIncreaseInAllowanceForCreditLossesOnLoansAndLeases": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Expected percentage of increase in allowance for credit losses on loans and leases upon adoption of new accounting standard.", "label": "Expected Percentage of Increase in Allowance for Credit Losses on Loans and Leases", "terseLabel": "Percentage of allowance for credit losses on loans and leases" } } }, "localname": "ExpectedPercentageOfIncreaseInAllowanceForCreditLossesOnLoansAndLeases", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "percentItemType" }, "trst_FDICAndOtherInsuranceExpense": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 7.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense for Federal Deposit Insurance Corporation (FDIC) and other insurance.", "label": "FDIC and Other Insurance Expense", "terseLabel": "FDIC and other insurance expense" } } }, "localname": "FDICAndOtherInsuranceExpense", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_FairValueOfPlanAssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Fair Value of Plan Assets [Abstract]", "terseLabel": "Fair value of plan assets by asset category [Abstract]" } } }, "localname": "FairValueOfPlanAssetsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "stringItemType" }, "trst_FairValueOfPlanAssetsByTypeOfFinancialInstrumentAndLevelHierarchyTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information includes the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.", "label": "Fair value of plan assets by type of financial instrument and level hierarchy [Table Text Block]", "terseLabel": "Fair Value of Plan Assets by type of Financial Instrument and Level Hierarchy" } } }, "localname": "FairValueOfPlanAssetsByTypeOfFinancialInstrumentAndLevelHierarchyTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "trst_FairValueOffBalanceSheetRisksTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Entire disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.", "label": "Fair Value Off Balance Sheet Risks [Text Block]", "terseLabel": "Off-Balance Sheet Financial Instruments" } } }, "localname": "FairValueOffBalanceSheetRisksTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstruments" ], "xbrltype": "textBlockItemType" }, "trst_FairValueTotal": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of debt and equity financial instruments classified as either held-to-maturity or available-for-sale.", "label": "Fair Value, Total", "terseLabel": "Fair value" } } }, "localname": "FairValueTotal", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "monetaryItemType" }, "trst_FederalFarmCreditBureauMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to federal farm credit bureau.", "label": "Federal Farm Credit Bureau [Member]", "terseLabel": "Federal Farm Credit Bureau [Member]" } } }, "localname": "FederalFarmCreditBureauMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "trst_FederalHomeLoanMortgageCorporationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to federal home loan mortgage corporation.", "label": "Federal Home Loan Mortgage Corporation [Member]", "terseLabel": "Federal Home Loan Mortgage Corporation [Member]" } } }, "localname": "FederalHomeLoanMortgageCorporationMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "trst_FederalNationalMortgageAssociationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to federal national mortgage association.", "label": "Federal National Mortgage Association [Member]", "terseLabel": "Federal National Mortgage Association [Member]" } } }, "localname": "FederalNationalMortgageAssociationMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "trst_FederalReserveBankAndFederalHomeLoanBankStockPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for Federal Reserve Bank and Federal Home Loan Bank Stock held.", "label": "Federal Reserve Bank and Federal Home Loan Bank Stock, Policy [Policy Text Block]", "terseLabel": "Federal Reserve Bank (FRB) and Federal Home Loan Bank (FHLB) stock" } } }, "localname": "FederalReserveBankAndFederalHomeLoanBankStockPolicyPolicyTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "trst_FederalReserveBankOfNewYorkMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Federal Reserve Bank located in New York, New York.", "label": "Federal Reserve Bank of New York [Member]" } } }, "localname": "FederalReserveBankOfNewYorkMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "domainItemType" }, "trst_FederalReserveBankReserveRequirement": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Balance maintained with the Federal Reserve Bank to meet reserve requirements pursuant to Federal Banking Regulations.", "label": "Federal Reserve Bank Reserve Requirement", "terseLabel": "Balances at other banks" } } }, "localname": "FederalReserveBankReserveRequirement", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BalancesAtOtherBanksDetails" ], "xbrltype": "monetaryItemType" }, "trst_FederalReserveBankReserveRequirementTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of balances with other banks including Federal Reserve Bank reserve requirement pursuant to Federal Banking Regulations.", "label": "Federal Reserve Bank Reserve Requirement [Text Block]", "verboseLabel": "Balances at Other Banks" } } }, "localname": "FederalReserveBankReserveRequirementTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BalancesAtOtherBanks" ], "xbrltype": "textBlockItemType" }, "trst_FeesForServicesToCustomers": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of noninterest income for fees charged from customers for the services provided.", "label": "Fees for Services to Customers", "terseLabel": "Fees for services to customers" } } }, "localname": "FeesForServicesToCustomers", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_FinancialInstrumentsAssetsLiabilitiesBalanceSheetGroupingsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financial Instruments Assets Liabilities Balance Sheet Groupings [Abstract]", "verboseLabel": "Carrying amounts and estimated fair values of financial instruments [Abstract]" } } }, "localname": "FinancialInstrumentsAssetsLiabilitiesBalanceSheetGroupingsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "trst_FinancialServicesIncome": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 0.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of noninterest income which is related to the financial services.", "label": "Financial Services Income", "terseLabel": "Trustco Financial Services income" } } }, "localname": "FinancialServicesIncome", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_FinancingReceivableAllowanceForCreditLossesLoansChargedOffAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financing Receivable Allowance For Credit Losses Loans Charged Off [Abstract]", "verboseLabel": "Loans charged off [Abstract]" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesLoansChargedOffAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "stringItemType" }, "trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of credit losses charge off net of recoveries related to financing receivables.", "label": "Financing Receivable Allowance of Credit Losses Net loans Charged off", "verboseLabel": "Net loans charged off (recoveries)" } } }, "localname": "FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "trst_FinancingReceivableModificationsInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financing Receivable Modifications Information [Abstract]" } } }, "localname": "FinancingReceivableModificationsInformationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "trst_FinancingReceivableModificationsSubsequentDefaultAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financing Receivable Modifications Subsequent Default [Abstract]", "verboseLabel": "Loans modified for which there was payment default [Abstract]" } } }, "localname": "FinancingReceivableModificationsSubsequentDefaultAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "stringItemType" }, "trst_FinancingReceivableRecordedInvestmentNonaccrualStatusAndOtherNonperformingRealEstateMortgages": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date combined with other nonperforming real estate mortgages.", "label": "Financing Receivable Recorded Investment Nonaccrual Status And Other Nonperforming Real Estate Mortgages", "terseLabel": "Total nonperforming loans" } } }, "localname": "FinancingReceivableRecordedInvestmentNonaccrualStatusAndOtherNonperformingRealEstateMortgages", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "monetaryItemType" }, "trst_FinancingReceivableRecoveriesOfLoansPreviouslyChargedOffAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financing Receivable Recoveries of Loans Previously Charged Off [Abstract]", "verboseLabel": "Recoveries of loans previously charged off [Abstract]" } } }, "localname": "FinancingReceivableRecoveriesOfLoansPreviouslyChargedOffAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "stringItemType" }, "trst_FinancingReceivablesTroubledDebtRestructuringUnderPaymentDefaultTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of financing receivables under troubled debt restructuring for which there is subsequent payment default.", "label": "Financing Receivables Troubled Debt Restructuring Under Payment Default [Table Text Block]", "verboseLabel": "Loans by Class Modified as TDR's For Which There was a Payment Default" } } }, "localname": "FinancingReceivablesTroubledDebtRestructuringUnderPaymentDefaultTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "trst_Four01KPlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A retirement savings plan sponsored by an employer. It lets workers save and invest a piece of their paycheck before taxes are taken out. Taxes aren't paid until the money is withdrawn from the account.", "label": "401(k) Plan [Member]", "terseLabel": "401(k) Plan [Member]" } } }, "localname": "Four01KPlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "domainItemType" }, "trst_GovernmentNationalMortgageAssociationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to government national mortgage association.", "label": "Government National Mortgage Association [Member]" } } }, "localname": "GovernmentNationalMortgageAssociationMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "trst_GrossChargeOffsResidentialImpairedLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.", "label": "Gross charge offs, residential impaired loans" } } }, "localname": "GrossChargeOffsResidentialImpairedLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "trst_HeldToMaturitySecuritiesSalesAndTransferredSecurity": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "For any transfer of securities categorized as held-to-maturity, this item represents the amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).", "label": "Held to Maturity Securities Sales and Transferred Security", "terseLabel": "Sales and transfers of held to maturity securities" } } }, "localname": "HeldToMaturitySecuritiesSalesAndTransferredSecurity", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "trst_ImpairedLoansIncludedInClassifiedLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of impaired loans included in classified loans.", "label": "Impaired loans included in classified loans" } } }, "localname": "ImpairedLoansIncludedInClassifiedLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "monetaryItemType" }, "trst_ImpairedLoansMeasurementInput": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Value of input used to measure impaired financing receivables.", "label": "Impaired Loans, Measurement Input", "terseLabel": "Impaired loans, unobservable inputs" } } }, "localname": "ImpairedLoansMeasurementInput", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "decimalItemType" }, "trst_IncentiveAndBonusPlansAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Incentive and Bonus Plans [Abstract]" } } }, "localname": "IncentiveAndBonusPlansAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "stringItemType" }, "trst_IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents income before equity in undistributed earnings of subsidiaries.", "label": "Income Before Equity In Undistributed Earnings Of Subsidiaries", "totalLabel": "Income before subsidiaries' undistributed earnings" } } }, "localname": "IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "trst_IncreaseDecreaseInDividendsPayable": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net change during the reporting period in cash disbursements due to share holders, representing the shareholders' declared portion of profits.", "label": "Increase (decrease) in dividends payable", "verboseLabel": "(Decrease) increase in dividends payable" } } }, "localname": "IncreaseDecreaseInDividendsPayable", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "trst_IncreaseDecreaseInOperatingLeaseLiabilities": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 15.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in operating lease liabilities classified as operating activities.", "label": "Increase (Decrease) in Operating Lease Liabilities", "terseLabel": "Decrease in operating lease liabilities" } } }, "localname": "IncreaseDecreaseInOperatingLeaseLiabilities", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "trst_IncreaseDecreaseInTaxesResultingFromAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Increase/(Decrease) in Taxes Resulting From [Abstract]", "terseLabel": "Increase/(decrease) in taxes resulting from [Abstract]" } } }, "localname": "IncreaseDecreaseInTaxesResultingFromAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "trst_InterchangeIncomeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Interchange revenue primarily consists of interchange fees, volume-related incentives and ATM charges.", "label": "Interchange Income [Member]", "terseLabel": "Interchange Income [Member]" } } }, "localname": "InterchangeIncomeMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "trst_InterestAndDividendIncomeOtherAvailableForSaleSecurities": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 6.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on other securities not disclosed elsewhere that are classified as available for sale.", "label": "Interest and Dividend Income, Other Available for Sale Securities", "terseLabel": "Other" } } }, "localname": "InterestAndDividendIncomeOtherAvailableForSaleSecurities", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSBAGuaranteedParticipationSecuritiesAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 4.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Interest And Dividend Income SBA Guaranteed Participation Securities Available For Sale", "terseLabel": "Small Business Administration-guaranteed participation securities" } } }, "localname": "InterestAndDividendIncomeSBAGuaranteedParticipationSecuritiesAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesCommercialMortgageBackedAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 5.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by commercial real estate mortgage loans and classified as available for sale.", "label": "Mortgage-backed securities and collateralized mortgage obligations-commercial", "verboseLabel": "Mortgage-backed securities and collateralized mortgage obligations-commercial" } } }, "localname": "InterestAndDividendIncomeSecuritiesCommercialMortgageBackedAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesCorporateDebtOperatingAvailableForSaleSecurities": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 3.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on corporate debt securities that are classified as available for sale.", "label": "Interest And Dividend Income Securities Corporate Debt Operating Available For Sale Securities", "terseLabel": "Corporate bonds" } } }, "localname": "InterestAndDividendIncomeSecuritiesCorporateDebtOperatingAvailableForSaleSecurities", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesCorporateDebtOperatingHeldToMaturity": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on corporate debt securities that are classified as held to maturity.", "label": "Interest And Dividend Income Securities Corporate Debt Operating, Held to Maturity", "terseLabel": "Corporate bonds" } } }, "localname": "InterestAndDividendIncomeSecuritiesCorporateDebtOperatingHeldToMaturity", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesResidentialMortgageBackedAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by residential real estate mortgage loans and classified as available for sale.", "label": "Mortgage-backed securities and collateralized mortgage obligations-residential", "terseLabel": "Mortgage-backed securities and collateralized mortgage obligations-residential" } } }, "localname": "InterestAndDividendIncomeSecuritiesResidentialMortgageBackedAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesResidentialMortgageBackedHeldToMaturity": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by residential real estate mortgage loans and classified as held to maturity.", "label": "Interest And Dividend Income Securities Residential Mortgage Backed, Held to Maturity", "terseLabel": "Mortgage-backed securities and collateralized mortgage obligations-residential" } } }, "localname": "InterestAndDividendIncomeSecuritiesResidentialMortgageBackedHeldToMaturity", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesStateAndMunicipalAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Interest or dividend income, including any amortization and accretion (as applicable) of discounts and premiums, derived from debt securities issued by municipal governments, and local taxing districts and classified as available for sale securities.", "label": "Interest And Dividend Income Securities State And Municipal Available For Sale", "terseLabel": "State and political subdivisions" } } }, "localname": "InterestAndDividendIncomeSecuritiesStateAndMunicipalAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestAndDividendIncomeSecuritiesUSGovernmentSponsoredEnterprisesAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 0.0, "parentTag": "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest and dividend income, including amortization and accretion of premiums and discounts, on securities issued by U.S. government sponsored enterprises and classified as available for sale securities.", "label": "Interest And Dividend Income Securities US Government Sponsored Enterprises, Available For Sale", "terseLabel": "U. S. government sponsored enterprises" } } }, "localname": "InterestAndDividendIncomeSecuritiesUSGovernmentSponsoredEnterprisesAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestBearingDepositFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all interest bearing deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits among others.", "label": "Interest bearing deposit, Fair Value Disclosure", "terseLabel": "Interest bearing deposits" } } }, "localname": "InterestBearingDepositFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_InterestExpenseMoneyMarketDepositsAndTimeDeposits": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 3.0, "parentTag": "us-gaap_InterestExpenseDeposits", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Interest expense incurred on all money market and time deposits.", "label": "Interest Expense Money Market Deposits And Time Deposits", "verboseLabel": "Time deposits and money market accounts" } } }, "localname": "InterestExpenseMoneyMarketDepositsAndTimeDeposits", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "trst_InterestExpenseOnDepositsTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of interest expense on deposit liabilities during the reporting period.", "label": "Interest expense on deposits [Table Text Block]", "terseLabel": "Interest Expense on Deposits" } } }, "localname": "InterestExpenseOnDepositsTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/DepositsTables" ], "xbrltype": "textBlockItemType" }, "trst_InterestIncomeOnFederalFundsSoldAndOtherShortTermInvestments": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 5.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Interest Income On Federal Funds Sold And Other Short Term Investments", "verboseLabel": "Interest on federal funds sold and other short-term investments" } } }, "localname": "InterestIncomeOnFederalFundsSoldAndOtherShortTermInvestments", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_InterestOnHeldToMaturitySecuritiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Interest on held to maturity securities: [Abstract]", "verboseLabel": "Interest on held to maturity securities:" } } }, "localname": "InterestOnHeldToMaturitySecuritiesAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "trst_InterestPayableFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents amount as of the balance sheet date of [accrued] interest payable on all forms of debt, including deposits and borrowings, that has been incurred and is unpaid.", "label": "Interest Payable Fair Value Disclosure", "terseLabel": "Accrued interest payable" } } }, "localname": "InterestPayableFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_InterestReceivableFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents amount as of the balance sheet date of [accrued] interest receivable on loans, investment securities and federal funds sold and other short-term investments that has been earned and is unpaid.", "label": "Interest Receivable Fair Value Disclosure", "terseLabel": "Accrued interest receivable" } } }, "localname": "InterestReceivableFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_InvestmentInFederalReserveBankAndFederalHomeLoanBankStockFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on an entity's books for investments in Federal Reserve Bank and Federal Home Loan Bank stock.", "label": "Investment In Federal Reserve Bank And Federal Home Loan Bank Stock Fair Value Disclosure", "terseLabel": "Federal Reserve Bank and Federal Home Loan Bank stock" } } }, "localname": "InvestmentInFederalReserveBankAndFederalHomeLoanBankStockFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "trst_LesseeOperatingLeaseSupplementalCashFlowInformationTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of supplemental cash flow information related to operating leases.", "label": "Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block]", "terseLabel": "Supplemental Cash Flows Information" } } }, "localname": "LesseeOperatingLeaseSupplementalCashFlowInformationTableTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OperatingLeasesTables" ], "xbrltype": "textBlockItemType" }, "trst_LoanToValueRatioApplicableToAdditionalAllowance": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The loan-to-value ratio that the company's allowance methodology also includes additional allocation percentage for during the period.", "label": "Loan to value ratio applicable to additional allowance", "terseLabel": "Loan-to-value ratio applicable to additional allowance" } } }, "localname": "LoanToValueRatioApplicableToAdditionalAllowance", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "percentItemType" }, "trst_LoansAndLeasesReceivableRelatedPartiesReductionInOutstandingLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The composition of related parties changed during the year resulting in a reduction of outstanding loans to related parties.", "label": "Loans and Leases Receivable, Related Parties, Reduction in outstanding loans", "terseLabel": "Reduction in outstanding loans" } } }, "localname": "LoansAndLeasesReceivableRelatedPartiesReductionInOutstandingLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "trst_LoansBasedOnImpairmentMethodAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Loans based on impairment method [Abstract]", "verboseLabel": "Loans [Abstract]" } } }, "localname": "LoansBasedOnImpairmentMethodAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "trst_LongTermPurchaseCommitmentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Long Term Purchase Commitment [Abstract]" } } }, "localname": "LongTermPurchaseCommitmentAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "trst_MajorCategoriesOfPensionAndPostretirementBenefitPlanAssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Major Categories of Pension and Postretirement Benefit Plan Assets: [Abstract]", "terseLabel": "Major categories of pension and postretirement benefit plan assets [Abstract]" } } }, "localname": "MajorCategoriesOfPensionAndPostretirementBenefitPlanAssetsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "stringItemType" }, "trst_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsCommercialFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 3.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Mortgage-backed securities and collateralized mortgage obligations - commercial.", "label": "Mortgage Backed Securities and Collateralized Mortgage Obligations Commercial Fair Value Disclosure", "terseLabel": "Mortgage backed securities and collateralized mortgage obligations - commercial" } } }, "localname": "MortgageBackedSecuritiesAndCollateralizedMortgageObligationsCommercialFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsResidentialFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 4.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Mortgage-backed securities and collateralized mortgage obligations - residential.", "label": "Mortgage backed securities and collateralized mortgage obligations residential fair value disclosure", "terseLabel": "Mortgage backed securities and collateralized mortgage obligations - residential" } } }, "localname": "MortgageBackedSecuritiesAndCollateralizedMortgageObligationsResidentialFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_NewYorkAndOtherStatesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Geographic territory of its branch locations in which entity lends money.", "label": "New York and other states [Member]", "terseLabel": "New York and Other States [Member]" } } }, "localname": "NewYorkAndOtherStatesMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "trst_NonAccrualResidentialMortgageLoansInTheProcessOfForeclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Non accrual residential mortgage loans in the process of foreclosure.", "label": "Non accrual residential mortgage loans in the process of foreclosure", "terseLabel": "Non accrual residential mortgage loans in the process of foreclosure" } } }, "localname": "NonAccrualResidentialMortgageLoansInTheProcessOfForeclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "monetaryItemType" }, "trst_NonAccrualStatusByLoanClassAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Non accrual status by loan class [Abstract]", "terseLabel": "Non accrual loans by loan class [Abstract]" } } }, "localname": "NonAccrualStatusByLoanClassAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "stringItemType" }, "trst_NonpaymentPeriodOfLoansMovedToNonaccrualStatus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The past due period before for loans considered to be in payment default.", "label": "Nonpayment period of loans moved to nonaccrual status", "terseLabel": "Non-payment period of loans moved to non-accrual status" } } }, "localname": "NonpaymentPeriodOfLoansMovedToNonaccrualStatus", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "durationItemType" }, "trst_NumberOfClassificationsForPromptCorrectiveActionRegulationsProvides": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to the number of classifications Prompt corrective action regulations provides.", "label": "Number of Classifications for Prompt Corrective Action Regulations Provides", "terseLabel": "Number of classifications for prompt corrective action regulations provide" } } }, "localname": "NumberOfClassificationsForPromptCorrectiveActionRegulationsProvides", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "integerItemType" }, "trst_NumberOfDaysPastDue": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of days loans are past due.", "label": "Number of days past due", "verboseLabel": "Number of days past due" } } }, "localname": "NumberOfDaysPastDue", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "durationItemType" }, "trst_NumberOfDaysPastDueLoanConsideredInPaymentDefault": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of days past due when loan is considered to be in payment default under the modified terms.", "label": "Number of days past due, loan considered in payment default", "verboseLabel": "Contractual past due period for loans to be in payment default" } } }, "localname": "NumberOfDaysPastDueLoanConsideredInPaymentDefault", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "durationItemType" }, "trst_NumberOfDaysPastDueWhenLoansConsideredInPaymentDefaultUnderModifiedTerms": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of days past due when loan is considered to be in payment default under the modified terms.", "label": "Number of days past due, when loans considered in payment default under modified terms", "verboseLabel": "Number of days past due when loans are considered to be in payment default" } } }, "localname": "NumberOfDaysPastDueWhenLoansConsideredInPaymentDefaultUnderModifiedTerms", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "durationItemType" }, "trst_NumberOfPastDuePaymentsForLoansClassifiedAsNonperforming": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The number of past due payments on loans classified as nonperforming.", "label": "Number of past due payments for loans classified as nonperforming", "terseLabel": "Number of past due payments on loans classified as nonperforming" } } }, "localname": "NumberOfPastDuePaymentsForLoansClassifiedAsNonperforming", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "integerItemType" }, "trst_OffBalanceSheetFinancialInstrumentsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Off Balance Sheet Financial Instruments [Abstract]" } } }, "localname": "OffBalanceSheetFinancialInstrumentsAbstract", "nsuri": "http://trustcobank.com/20191231", "xbrltype": "stringItemType" }, "trst_OffBalanceSheetInstrumentTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The expiration period of off-balance sheet instruments.", "label": "Off balance sheet instrument term" } } }, "localname": "OffBalanceSheetInstrumentTerm", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "durationItemType" }, "trst_OffBalanceSheetRisksAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Off-Balance Sheet Risks [Abstract]" } } }, "localname": "OffBalanceSheetRisksAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "trst_OpenTaxYearsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Open Tax Years [Abstract]" } } }, "localname": "OpenTaxYearsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "trst_OperatingLeaseRightOfUseAssetAmortization": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 4.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense attributable to right-of-use asset from operating lease.", "label": "Operating Lease, Right-of-Use Asset, Amortization", "terseLabel": "Amortization of right-of-use asset" } } }, "localname": "OperatingLeaseRightOfUseAssetAmortization", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "trst_OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationOfNetGainBeforeTax": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 3.0, "parentTag": "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of amortization of gain for (increase) in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.", "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Amortization of Net Gain, before Tax", "negatedLabel": "Amortization of net gain" } } }, "localname": "OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationOfNetGainBeforeTax", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationOfNetLossBeforeTax": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 4.0, "parentTag": "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of amortization of (loss) for decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.", "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Amortization of Net (Loss), before Tax", "terseLabel": "Amortization of net (loss)" } } }, "localname": "OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationOfNetLossBeforeTax", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherComprehensiveIncomeLossDefinedBenefitPlanChangeInOverfundedPositionBeforeTax": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails": { "order": 0.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of cost (credit) of benefit change attributable to participants' change in overfunded position of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, Change in overfunded position, before Tax", "verboseLabel": "Change in overfunded position of pension and postretirement benefits" } } }, "localname": "OtherComprehensiveIncomeLossDefinedBenefitPlanChangeInOverfundedPositionBeforeTax", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherEquityBasedCashSettledAwardsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to other equity based cash settled awards.", "label": "Other Equity Based Cash Settled Awards [Member]", "terseLabel": "Other Equity Based Cash Settled Awards [Member]" } } }, "localname": "OtherEquityBasedCashSettledAwardsMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "trst_OtherIncomeOrExpenseNotYetReportedForTaxPurposes": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This represents the net of other income and expense items which have been recorded for book purposes and have yet to be reported for tax purposes and are included in the temporary differences that make up our net deferred tax asset.", "label": "Other Income Or Expense Not Yet Reported For Tax Purposes", "terseLabel": "Other income or expense not yet reported for tax purposes" } } }, "localname": "OtherIncomeOrExpenseNotYetReportedForTaxPurposes", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the other 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.", "label": "Other [Member]" } } }, "localname": "OtherMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "trst_OtherNonInterestIncome": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the total of other noninterest income derived from other activities which are not within the scope of ASC 606.", "label": "Other Non Interest Income", "terseLabel": "Other" } } }, "localname": "OtherNonInterestIncome", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherRealEstateIncomeExpenseNet": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 8.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Other real estate (income) expense, net during the period.", "label": "Other real estate (income) expense, net" } } }, "localname": "OtherRealEstateIncomeExpenseNet", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_OtherRealEstateMortgageLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Other real estate mortgage loans that are on nonperforming status on balance sheet date.", "label": "Other real estate mortgage loans", "verboseLabel": "Restructured real estate mortgages - 1 to 4 family" } } }, "localname": "OtherRealEstateMortgageLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherRealEstateOwned": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Carrying amount of residential real estate assets taken in settlement of troubled loans through surrender on foreclosure.", "label": "Other real estate owned", "verboseLabel": "Other real estate owned" } } }, "localname": "OtherRealEstateOwned", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherRealEstateOwnedCommercialRealEstateFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The fair value disclosure of commercial real estate included in other real estate owned.", "label": "Other real estate owned, commercial real estate, fair value disclosure", "terseLabel": "Other real estate owned, commercial real estate" } } }, "localname": "OtherRealEstateOwnedCommercialRealEstateFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherRealEstateOwnedResidentialRealEstatePropertiesFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The fair value disclosure of residential real estate properties included in other real estate owned.", "label": "Other real estate owned, residential real estate properties, fair value disclosure", "terseLabel": "Other real estate owned, residential real estate properties" } } }, "localname": "OtherRealEstateOwnedResidentialRealEstatePropertiesFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherSecuritiesFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 7.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Other securities, those which are not otherwise identified in the taxonomy.", "label": "Other Securities, Fair Value Disclosure", "terseLabel": "Other" } } }, "localname": "OtherSecuritiesFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_OtherThanTemporaryImpairmentOttiPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for the other than temporary impairment of marketable securities.", "label": "Other Than Temporary Impairment (OTTI) [Policy Text Block]", "verboseLabel": "Other-Than-Temporary-Impairment (\"OTTI\")" } } }, "localname": "OtherThanTemporaryImpairmentOttiPolicyTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "trst_OutsourcedServices": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 5.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Outsourced services", "terseLabel": "Outsourced service expense" } } }, "localname": "OutsourcedServices", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "trst_OverdraftFeesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the fees are recognized at the point in time that the overdraft occurs.", "label": "Overdraft Fees [Member]", "terseLabel": "Overdraft Fees [Member]" } } }, "localname": "OverdraftFeesMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "trst_PercentageOfEmployeeCompensationFullyMatchedByEmployer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Employee compensation that is fully matched by the employer.", "label": "Percentage of employee compensation fully matched by the employer", "terseLabel": "Aggregate salary contribution matched by employer, first match" } } }, "localname": "PercentageOfEmployeeCompensationFullyMatchedByEmployer", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "percentItemType" }, "trst_PercentageOfSharesVestedAfterTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage of shares awarded that will vest after the stated term.", "label": "Percentage of shares vested after term", "terseLabel": "Shares vested after term" } } }, "localname": "PercentageOfSharesVestedAfterTerm", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "percentItemType" }, "trst_PerformanceBonusUnitsAwardsRelatedToChangeOfControl": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Performance bonus units awards related to change of control that were taken in prior years", "label": "Performance bonus units awards related to change of control", "terseLabel": "Number of awards (in shares)" } } }, "localname": "PerformanceBonusUnitsAwardsRelatedToChangeOfControl", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "sharesItemType" }, "trst_ProceedsFromCallsOfSecuritiesAvailableForSaleAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Proceeds from Calls of Securities Available for Sale [Abstract]", "terseLabel": "Proceeds from calls/paydowns of securities available for sale [Abstract]" } } }, "localname": "ProceedsFromCallsOfSecuritiesAvailableForSaleAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "stringItemType" }, "trst_ProceedsFromCallsPaydownsOfAvailableForSaleSecurities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the calls/paydowns (requests of early payments) of debt and equity securities classified as available-for-sale securities.", "label": "Proceeds from calls, paydowns of available for sale securities", "terseLabel": "Proceeds from calls/paydowns" } } }, "localname": "ProceedsFromCallsPaydownsOfAvailableForSaleSecurities", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "monetaryItemType" }, "trst_ProceedsFromSaleOfFederalReserveStockAndFederalHomeLoanBankStock": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 9.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the redemption of the Federal Reserve Stock and Federal Home Loan Bank Stock during the period.", "label": "Proceeds From Sale Of Federal Reserve Stock And Federal Home Loan Bank Stock", "terseLabel": "Proceeds from redemptions of Federal Reserve Bank and Federal Home Loan Bank stock" } } }, "localname": "ProceedsFromSaleOfFederalReserveStockAndFederalHomeLoanBankStock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "trst_ProceedsFromSalesAndCallsOfSecuritiesAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the sale and calls (requests of early payments) of debt and equity securities classified as available-for-sale securities.", "label": "Proceeds From Sales And Calls Of Securities Available For Sale", "verboseLabel": "Proceeds from sales, paydowns and calls of securities available for sale" } } }, "localname": "ProceedsFromSalesAndCallsOfSecuritiesAvailableForSale", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "trst_ProfitSharingContribution": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The profit sharing contribution incurred during the period.", "label": "Profit sharing contribution", "terseLabel": "Profit sharing contribution" } } }, "localname": "ProfitSharingContribution", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "monetaryItemType" }, "trst_PropertyPlantAndEquipmentInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Property Plant and Equipment Information [Abstract]", "terseLabel": "Property Plant and Equipment Information [Abstract]" } } }, "localname": "PropertyPlantAndEquipmentInformationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "stringItemType" }, "trst_RealEstateMortgagesOneToFourFamilyClassifiedAsImpairedFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents real estate mortgages for one to four family units that are classified as impaired at the end of the period.", "label": "Real Estate Mortgages One To Four Family Classified As Impaired Fair Value Disclosure", "terseLabel": "Real estate mortgage - 1 to 4 family" } } }, "localname": "RealEstateMortgagesOneToFourFamilyClassifiedAsImpairedFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "trst_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]", "verboseLabel": "Reclassification Adjustment out of Accumulated Other Comprehensive Income [Abstract]" } } }, "localname": "ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "trst_RiskBasedCapitalRatioCapitalConservationBuffer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Total risk based capital ratio, capital conservation buffer of risk-weighted assets.", "label": "Risk Based Capital Ratio, Capital Conservation Buffer", "terseLabel": "Total risk based capital ratio, capital conservation buffer" } } }, "localname": "RiskBasedCapitalRatioCapitalConservationBuffer", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "trst_SecuritiesHeldInAvailableForSaleAndHeldToMaturityPortfoliosThatRepresentGreaterThan10OfShareholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Securities Held In Available For Sale And Held To Maturity Portfolios That Represent Greater Than 10% Of Shareholders Equity [Abstract]", "terseLabel": "Securities Held in Available for Sale and Held to Maturity Portfolios that Represent Greater than 10% of Shareholders Equity [Abstract]" } } }, "localname": "SecuritiesHeldInAvailableForSaleAndHeldToMaturityPortfoliosThatRepresentGreaterThan10OfShareholdersEquityAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "stringItemType" }, "trst_ServiceChargesOnDepositsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents service charges on deposits are withdrawn from the customer's account balance.", "label": "Service Charges on Deposits [Member]", "terseLabel": "Service Charges on Deposits [Member]" } } }, "localname": "ServiceChargesOnDepositsMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "trst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfFairValue": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The exercise price of each option on the fair value of the entity stock on the date of grant.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Exercise Price as Percentage of Fair Value", "terseLabel": "Exercise price as percentage of fair value" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfFairValue", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "percentItemType" }, "trst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPriceAsPercentageOfFairValue": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The option price as percentage of fair value for grant of stock options on the date of grant.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Option Price as Percentage of Fair Value", "terseLabel": "Option price as percentage of fair value" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPriceAsPercentageOfFairValue", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "percentItemType" }, "trst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Share-based Compensation Arrangement by Share based Payment Award, Options, Exercisable [Roll Forward]", "terseLabel": "Stock Option Awards, Exercisable [Roll Forward]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRollForward", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "trst_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareholdingPercentageForGrantOfStockOptions": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The shareholding percentage for grant of stock options on the date of grant.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Shareholding Percentage for Grant of Stock Options", "terseLabel": "Shareholding percentage for grant of stock options" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardShareholdingPercentageForGrantOfStockOptions", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "percentItemType" }, "trst_SmallBusinessAdministrationGuaranteedParticipationSecuritiesFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 5.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Small business administration guaranteed participation securities.", "label": "Small Business Administration Guaranteed Participation Securities, Fair Value Disclosure", "terseLabel": "Small Business Administration - guaranteed participation securities" } } }, "localname": "SmallBusinessAdministrationGuaranteedParticipationSecuritiesFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_SmallBusinessAdministrationGuaranteedParticipationSecuritiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Refers to small business administration-guaranteed participation securities.", "label": "Small Business Administration Guaranteed Participation Securities [Member]", "verboseLabel": "Small Business Administration-Guaranteed Participation Securities [Member]" } } }, "localname": "SmallBusinessAdministrationGuaranteedParticipationSecuritiesMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "domainItemType" }, "trst_StateAndPoliticalSubdivisionsFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 2.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities of State and political subdivisions.", "label": "State and political subdivisions, fair value disclosure", "terseLabel": "State and political subdivisions" } } }, "localname": "StateAndPoliticalSubdivisionsFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_StockBasedCompensationPlansEquityAwardsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Stock-Based Compensation Plans - Equity Awards [Abstract]" } } }, "localname": "StockBasedCompensationPlansEquityAwardsAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "trst_SupplementalCashFlowsInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Supplemental Cash Flows Information [Abstract]", "terseLabel": "Supplemental cash flows information [Abstract]" } } }, "localname": "SupplementalCashFlowsInformationAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "trst_SupplementaryPensionPlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents supplementary pension plan under which additional retirement benefits accrue for eligible executive officers in excess of certain IRS limitations.", "label": "Supplementary pension plan [Member]", "terseLabel": "Supplementary Pension Plan [Member]" } } }, "localname": "SupplementaryPensionPlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "domainItemType" }, "trst_TaxCutsAndJobsActAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Tax Cuts and Jobs Act [Abstract]" } } }, "localname": "TaxCutsAndJobsActAbstract", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "trst_TaxCutsAndJobsActOf2017OtherComprehensiveIncomeLossTaxEffect": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in other comprehensive income from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017.", "label": "Tax Cuts and Jobs Act of 2017, Other comprehensive income (loss), Tax Effect", "terseLabel": "Tax Cuts and Jobs Act of 2017, Other comprehensive income (loss), Tax Effect" } } }, "localname": "TaxCutsAndJobsActOf2017OtherComprehensiveIncomeLossTaxEffect", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "trst_TdrSClassificationsFromPreviouslyPerformingLoans": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings in accordance with OCC guidance related to chapter 7 Bankruptcy Loans.", "label": "TDR's Classifications From Previously Performing Loans", "terseLabel": "TDR's classifications from previously performing loans" } } }, "localname": "TdrSClassificationsFromPreviouslyPerformingLoans", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "monetaryItemType" }, "trst_ThirdPartyServiceAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The contracted third-party service providers to perform certain banking functions", "label": "Third-Party Service Agreement [Member]", "terseLabel": "Third-Party Service Agreement [Member]" } } }, "localname": "ThirdPartyServiceAgreementMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "trst_TierOneRiskBasedCapitalRatioCapitalConservationBuffer": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tier 1 risk based capital ratio, capital conservation buffer of risk-weighted assets.", "label": "Tier One Risk Based Capital Ratio, Capital Conservation Buffer", "terseLabel": "Tier 1 risk based capital ratio, capital conservation buffer" } } }, "localname": "TierOneRiskBasedCapitalRatioCapitalConservationBuffer", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "trst_TrustAssetsPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of amount of and accounting policy for trust assets.", "label": "Trust Assets [Policy Text Block]", "terseLabel": "Trust Assets" } } }, "localname": "TrustAssetsPolicyTextBlock", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "trst_TrustcoBankCorpNyStockOptionPlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity-based arrangement under which compensation is awarded to employees and directors.", "label": "2010 TrustCo Bank Corp NY Stock Option Plan [Member]", "terseLabel": "2010 Employee Stock Option Plan [Member]" } } }, "localname": "TrustcoBankCorpNyStockOptionPlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "trst_TwoThousandNineteenEquityIncentivePlanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity Incentive Plan Agreement (\"Agreement\") is a legal contract between a Corporation and its employees to provide the employee with an interest in the Corporation. The purpose of an Equity Incentive Plan is to strengthen the financials of the Corporation by providing incentive stock options to its employees.", "label": "Two Thousand Nineteen Equity Incentive Plan [Member]", "verboseLabel": "2019 Equity Incentive Plan [Member]" } } }, "localname": "TwoThousandNineteenEquityIncentivePlanMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "trst_USGovernmentSponsoredEnterprisesFairValueDisclosure": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": 1.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities of U.S. government-sponsored enterprises.", "label": "U.S. government sponsored enterprises fair value disclosure", "terseLabel": "U.S. government sponsored enterprises" } } }, "localname": "USGovernmentSponsoredEnterprisesFairValueDisclosure", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "trst_VariableRateProduct": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage of loan commitments represented by variable rate products.", "label": "Variable rate product", "terseLabel": "Variable rate product commitments" } } }, "localname": "VariableRateProduct", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "percentItemType" }, "trst_WealthManagementFeesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "These fees earned over time as the Company provides the contracted monthly or quarterly services and are generally assessed over the period in which services are performed based on a percentage of the fair value of assets under management or administration.", "label": "Wealth Management Fees [Member]", "terseLabel": "Wealth Management Fees [Member]" } } }, "localname": "WealthManagementFeesMember", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "domainItemType" }, "trst_WeightedAverageInterestRateForYear": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Reflects the calculation for the period of the average interest rate weighted by the average amount of short-term debt outstanding by type or by instrument at that time.", "label": "Weighted average interest rate, for year", "terseLabel": "Weighted average interest rate, For the year" } } }, "localname": "WeightedAverageInterestRateForYear", "nsuri": "http://trustcobank.com/20191231", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_AOCIAttributableToParentNetOfTaxRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]" } } }, "localname": "AOCIAttributableToParentNetOfTaxRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccountingPoliciesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Basis of Presentation [Abstract]" } } }, "localname": "AccountingPoliciesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_AccountingStandardsUpdate201602Member": { "auth_ref": [ "r408" ], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).", "label": "ASU 2016-02 [Member]" } } }, "localname": "AccountingStandardsUpdate201602Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccountingStandardsUpdate201613Member": { "auth_ref": [ "r210" ], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2016-13 Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.", "label": "Accounting Standards Update 2016-13 [Member]", "terseLabel": "ASU 2016-13 [Member]" } } }, "localname": "AccountingStandardsUpdate201613Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccountsNotesAndLoansReceivableLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Accounts, Notes, Loans and Financing Receivable [Line Items]" } } }, "localname": "AccountsNotesAndLoansReceivableLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments": { "auth_ref": [ "r82" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 7.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.", "label": "Accretion (Amortization) of Discounts and Premiums, Investments", "negatedLabel": "Net amortization of securities" } } }, "localname": "AccretionAmortizationOfDiscountsAndPremiumsInvestments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedLiabilitiesAndOtherLiabilities": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other.", "label": "Accrued expenses and other liabilities", "terseLabel": "Accrued expenses and other liabilities" } } }, "localname": "AccruedLiabilitiesAndOtherLiabilities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedRentCurrentAndNoncurrent": { "auth_ref": [ "r8", "r9", "r439", "r489" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements.", "label": "Accrued Rent", "terseLabel": "Accrued rent" } } }, "localname": "AccruedRentCurrentAndNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": { "auth_ref": [ "r33", "r41", "r44", "r290", "r376" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent.", "label": "Amortization of Pension and Postretirement Benefit Items [Member]", "verboseLabel": "Net Change in Net Actuarial Loss and Prior Service Credit/Cost on Pension and Postretirement Benefit Plans, Net of Tax [Member]" } } }, "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember": { "auth_ref": [ "r35", "r41", "r44", "r289", "r376" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive (income) loss related to prior service cost (credit) component of defined benefit plans attributable to the parent.", "label": "Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]", "terseLabel": "Amortization of Prior Service Cost [Member]" } } }, "localname": "AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember": { "auth_ref": [ "r32", "r41", "r44", "r289", "r376" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive income (loss) related to gain (loss) component of defined benefit plans attributable to the parent.", "label": "Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]", "terseLabel": "Amortization of Net Actuarial Gain (Loss) [Member]" } } }, "localname": "AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": { "auth_ref": [ "r20", "r239" ], "calculation": { "http://trustcobank.com/role/BankPremisesAndEquipmentDetails": { "order": 2.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.", "label": "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment", "negatedLabel": "Accumulated depreciation and amortization" } } }, "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember": { "auth_ref": [ "r29", "r30", "r31", "r41", "r44" ], "lang": { "en-US": { "role": { "documentation": "Accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.", "label": "AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]", "terseLabel": "Unrealized Gains on Securities Available for Sale [Member]", "verboseLabel": "Net Unrealized Holding Loss on Securities Available for Sale, Net of Tax [Member]" } } }, "localname": "AccumulatedNetUnrealizedInvestmentGainLossMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Accumulated Other Comprehensive Income (Loss) [Line Items]", "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r37", "r40", "r41" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 3.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.", "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax", "terseLabel": "Accumulated other comprehensive income (loss), net of tax" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss).", "label": "Accumulated Other Comprehensive Income (Loss) [Table]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r36", "r41", "r44", "r376" ], "lang": { "en-US": { "role": { "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.", "label": "Accumulated Other Comprehensive Income (Loss) [Member]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r12" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.", "label": "Surplus" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapitalMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.", "label": "Additional Paid-in Capital [Member]", "terseLabel": "Surplus [Member]" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": { "auth_ref": [ "r102" ], "lang": { "en-US": { "role": { "documentation": "Information by new accounting pronouncement.", "label": "Adjustments for New Accounting Pronouncements [Axis]" } } }, "localname": "AdjustmentsForNewAccountingPronouncementsAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": { "auth_ref": [ "r315", "r317", "r340", "r341" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.", "label": "Stock based compensation expense" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r82" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.", "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities", "totalLabel": "Total adjustments" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Adjustments to reconcile net income to net cash provided by operating activities:", "terseLabel": "Adjustments to reconcile net income to net cash provided by operating activities [Abstract]" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AdvertisingExpense": { "auth_ref": [ "r343" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 6.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.", "label": "Advertising expense" } } }, "localname": "AdvertisingExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock": { "auth_ref": [ "r151", "r214" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of allowance for credit loss on financing receivable.", "label": "Activity in Allowance For Loan Losses by Portfolio Segment" } } }, "localname": "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax": { "auth_ref": [ "r308" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.", "label": "Total amount recognized in net periodic benefit (credit) cost and other comprehensive (loss) income" } } }, "localname": "AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": { "auth_ref": [ "r116" ], "lang": { "en-US": { "role": { "documentation": "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.", "label": "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount", "verboseLabel": "Antidilutive stock options excluded from diluted earnings per share (in shares)" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis": { "auth_ref": [ "r116" ], "lang": { "en-US": { "role": { "documentation": "Information by type of antidilutive security.", "label": "Antidilutive Securities [Axis]" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AntidilutiveSecuritiesNameDomain": { "auth_ref": [ "r116" ], "lang": { "en-US": { "role": { "documentation": "Incremental common shares attributable to securities that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.", "label": "Antidilutive Securities, Name [Domain]" } } }, "localname": "AntidilutiveSecuritiesNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "domainItemType" }, "us-gaap_Assets": { "auth_ref": [ "r137", "r437", "r488" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets", "totalLabel": "Total assets" } } }, "localname": "Assets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets [Abstract]", "terseLabel": "Assets [Abstract]", "verboseLabel": "ASSETS" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsHeldInTrustAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets Held-in-trust [Abstract]" } } }, "localname": "AssetsHeldInTrustAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsHeldInTrustNoncurrent": { "auth_ref": [ "r93" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.", "label": "Assets Held-in-trust, Noncurrent", "verboseLabel": "Assets held in trust" } } }, "localname": "AssetsHeldInTrustNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": { "auth_ref": [ "r187" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails": { "order": 2.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax", "terseLabel": "Gross Unrealized Gains" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": { "auth_ref": [ "r188" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails": { "order": 1.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax", "terseLabel": "Gross Unrealized Losses" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": { "auth_ref": [ "r185", "r228" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Debt Securities, Available-for-sale, Amortized Cost", "totalLabel": "Amortized Cost" } } }, "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Securities available for sale [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.", "label": "Change in unrealized gain (loss) on securities available for sale - gross of deferred taxes" } } }, "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Available for sale securities unrealized loss position - Gross Unrealized Loss [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]", "terseLabel": "Available for sale securities unrealized loss position - Fair Value [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Available for sale portfolio based on contractual maturity [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost": { "auth_ref": [ "r192" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Due after five years through ten years" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": { "auth_ref": [ "r189", "r192", "r469" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": 2.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value", "verboseLabel": "Due after five years through ten years" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost": { "auth_ref": [ "r191" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Due in one year through five years" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": { "auth_ref": [ "r189", "r191", "r468" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": 1.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value", "verboseLabel": "Due in one year through five years" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Amortized Cost [Abstract]", "terseLabel": "Amortized cost and fair value of the securities available for sale [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]", "verboseLabel": "Fair Value [Abstract]" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost": { "auth_ref": [ "r190" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Due in one year or less" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": { "auth_ref": [ "r189", "r190", "r467" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": 0.0, "parentTag": "us-gaap_AvailableForSaleSecuritiesDebtSecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.", "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value", "verboseLabel": "Due in one year or less" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost": { "auth_ref": [ "r193" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), without single maturity date and not allocated over maturity grouping.", "label": "Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost", "terseLabel": "Securities, amortized cost" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue": { "auth_ref": [ "r193" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": 4.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), without single maturity date and not allocated over maturity grouping.", "label": "Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value", "terseLabel": "Securities, fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtSecurities": { "auth_ref": [ "r181", "r186", "r228" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_Assets", "weight": 1.0 }, "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails": { "order": 0.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 }, "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails": { "order": 5.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails": { "order": 2.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Securities available for sale", "terseLabel": "Fair Value", "totalLabel": "Total securities available for sale" } } }, "localname": "AvailableForSaleSecuritiesDebtSecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesGrossRealizedGains": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.", "label": "Available-for-sale Securities, Gross Realized Gains", "terseLabel": "Realized gains" } } }, "localname": "AvailableForSaleSecuritiesGrossRealizedGains", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.", "label": "Available-for-sale Securities, Gross Realized Losses", "terseLabel": "Realized losses" } } }, "localname": "AvailableForSaleSecuritiesGrossRealizedLosses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesRestricted": { "auth_ref": [ "r98", "r166", "r442", "r486", "r503", "r507" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.", "label": "Securities available for sale pledged to secure short-term borrowings and for other purposes" } } }, "localname": "AvailableForSaleSecuritiesRestricted", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableforsaleSecuritiesMember": { "auth_ref": [ "r206" ], "lang": { "en-US": { "role": { "documentation": "Investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Securities Available for Sale [Member]" } } }, "localname": "AvailableforsaleSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "domainItemType" }, "us-gaap_AwardTypeAxis": { "auth_ref": [ "r318", "r338" ], "lang": { "en-US": { "role": { "documentation": "Information by type of award under share-based payment arrangement.", "label": "Award Type [Axis]" } } }, "localname": "AwardTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BuildingMember": { "auth_ref": [ "r238" ], "lang": { "en-US": { "role": { "documentation": "Facility held for productive use including, but not limited to, office, production, storage and distribution facilities.", "label": "Building [Member]", "terseLabel": "Buildings [Member]" } } }, "localname": "BuildingMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_Capital": { "auth_ref": [ "r483", "r484", "r512", "r513" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of total capital as defined in the regulations.", "label": "Capital", "terseLabel": "Total risk-based capital" } } }, "localname": "Capital", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets": { "auth_ref": [ "r474", "r477", "r484" ], "lang": { "en-US": { "role": { "documentation": "The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.", "label": "Capital Required for Capital Adequacy to Risk Weighted Assets", "verboseLabel": "Total risk-based capital, minimum for capital adequacy plus capital conservation" } } }, "localname": "CapitalRequiredForCapitalAdequacyToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets": { "auth_ref": [ "r474" ], "lang": { "en-US": { "role": { "documentation": "The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as \"well capitalized\", in the regulatory framework for prompt corrective action.", "label": "Capital Required to be Well Capitalized to Risk Weighted Assets", "verboseLabel": "Total risk-based capital, well capitalized" } } }, "localname": "CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_CapitalToRiskWeightedAssets": { "auth_ref": [ "r474", "r484" ], "lang": { "en-US": { "role": { "documentation": "Total Capital divided by risk weighted assets as defined in the regulations.", "label": "Capital to Risk Weighted Assets", "verboseLabel": "Total risk-based capital, ratio" } } }, "localname": "CapitalToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_CarryingReportedAmountFairValueDisclosureMember": { "auth_ref": [ "r397", "r398" ], "lang": { "en-US": { "role": { "documentation": "Measured as reported on the statement of financial position (balance sheet).", "label": "Carrying Value [Member]" } } }, "localname": "CarryingReportedAmountFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r1", "r17", "r83" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 0.0, "parentTag": "us-gaap_Assets", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails": { "order": 0.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.", "label": "Cash and cash equivalents", "terseLabel": "Cash in subsidiary bank", "totalLabel": "Total cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash and Cash Equivalents [Member]" } } }, "localname": "CashAndCashEquivalentsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CashAndCashEquivalentsPolicyTextBlock": { "auth_ref": [ "r2", "r85", "r91" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.", "label": "Cash and Cash Equivalents, Policy [Policy Text Block]", "terseLabel": "Cash and Cash Equivalents" } } }, "localname": "CashAndCashEquivalentsPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CashAndDueFromBanks": { "auth_ref": [ "r435" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_CashAndCashEquivalentsAtCarryingValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.", "label": "Cash and Due from Banks", "verboseLabel": "Cash and due from banks" } } }, "localname": "CashAndDueFromBanks", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndDueFromBanksAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Balances at Other Banks [Abstract]" } } }, "localname": "CashAndDueFromBanksAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": { "auth_ref": [ "r76", "r83", "r90" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents", "periodEndLabel": "Cash and cash equivalents at end of period", "periodStartLabel": "Cash and cash equivalents at beginning of period" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect": { "auth_ref": [ "r76", "r404" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect", "totalLabel": "Net decrease in cash and cash equivalents" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Non cash investing and financing activities:" } } }, "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_CommercialPortfolioSegmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Portfolio segment of the company's total financing receivables related to commercial receivables.", "label": "Commercial [Member]" } } }, "localname": "CommercialPortfolioSegmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommercialRealEstateMember": { "auth_ref": [ "r224", "r278" ], "lang": { "en-US": { "role": { "documentation": "Property that is solely used for business purposes.", "label": "Commercial Real Estate [Member]", "verboseLabel": "Commercial Real Estate [Member]" } } }, "localname": "CommercialRealEstateMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r25", "r244", "r447", "r494" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.", "label": "Commitments and Contingencies", "terseLabel": "Commitments and contingent liabilities" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Commitments and Contingent Liabilities [Abstract]" } } }, "localname": "CommitmentsAndContingenciesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": { "auth_ref": [ "r243", "r245" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for commitments and contingencies.", "label": "Commitments and Contingent Liabilities" } } }, "localname": "CommitmentsAndContingenciesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilities" ], "xbrltype": "textBlockItemType" }, "us-gaap_CommitmentsToExtendCreditMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loan commitments are legally binding commitments to extend credit to a counterparty under certain terms and conditions.", "label": "Commitments to Extend Credit [Member]" } } }, "localname": "CommitmentsToExtendCreditMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommonEquityTierOneCapital": { "auth_ref": [ "r474" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of Common Equity Tier One Risk-based Capital, as defined by regulatory framework.", "label": "Common Equity Tier One Capital", "terseLabel": "Common equity Tier 1 capital" } } }, "localname": "CommonEquityTierOneCapital", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommonEquityTierOneCapitalRatio": { "auth_ref": [ "r474" ], "lang": { "en-US": { "role": { "documentation": "Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework.", "label": "Common Equity Tier One Capital Ratio", "terseLabel": "Common equity Tier 1 capital, ratio" } } }, "localname": "CommonEquityTierOneCapitalRatio", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_CommonStockDividendsPerShareDeclared": { "auth_ref": [ "r253" ], "lang": { "en-US": { "role": { "documentation": "Aggregate dividends declared during the period for each share of common stock outstanding.", "label": "Cash dividend declared (in dollars per share)" } } }, "localname": "CommonStockDividendsPerShareDeclared", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Stock that is subordinate to all other stock of the issuer.", "label": "Common Stock [Member]", "terseLabel": "Capital Stock [Member]" } } }, "localname": "CommonStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r11" ], "lang": { "en-US": { "role": { "documentation": "Face amount or stated value per share of common stock.", "label": "Capital stock, par value (in dollars per share)" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r11" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.", "label": "Capital stock, shares authorized (in shares)" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r11" ], "lang": { "en-US": { "role": { "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.", "label": "Capital stock, shares issued (in shares)" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r11" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 0.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Capital stock: $1 par value; 150,000,000 shares authorized, 100,204,832 and 100,175,032 shares issued at December 31, 2019 and 2018, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_CompensationAndEmployeeBenefitPlansTextBlock": { "auth_ref": [ "r261", "r264", "r314", "r342" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.", "label": "Compensation and Employee Benefit Plans [Text Block]", "verboseLabel": "Benefit Plans" } } }, "localname": "CompensationAndEmployeeBenefitPlansTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlans" ], "xbrltype": "textBlockItemType" }, "us-gaap_CompensationAndRetirementDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Benefit Plans [Abstract]" } } }, "localname": "CompensationAndRetirementDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]" } } }, "localname": "ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Components of deferred tax assets and liabilities [Abstract]" } } }, "localname": "ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ComprehensiveIncomeNetOfTax": { "auth_ref": [ "r47", "r49", "r50" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent", "totalLabel": "Comprehensive income" } } }, "localname": "ComprehensiveIncomeNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNoteTextBlock": { "auth_ref": [ "r64" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.", "label": "Comprehensive Income (Loss) Note [Text Block]", "verboseLabel": "Accumulated Other Comprehensive Loss" } } }, "localname": "ComprehensiveIncomeNoteTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLoss" ], "xbrltype": "textBlockItemType" }, "us-gaap_ComprehensiveIncomePolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for comprehensive income.", "label": "Comprehensive Income (Loss)" } } }, "localname": "ComprehensiveIncomePolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConcentrationRiskBenchmarkDomain": { "auth_ref": [ "r126", "r127", "r399", "r400" ], "lang": { "en-US": { "role": { "documentation": "The denominator in a calculation of a disclosed concentration risk percentage.", "label": "Concentration Risk Benchmark [Domain]" } } }, "localname": "ConcentrationRiskBenchmarkDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ConcentrationRiskByBenchmarkAxis": { "auth_ref": [ "r126", "r127", "r399", "r400", "r502" ], "lang": { "en-US": { "role": { "documentation": "Information by benchmark of concentration risk.", "label": "Concentration Risk Benchmark [Axis]" } } }, "localname": "ConcentrationRiskByBenchmarkAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ConcentrationRiskLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Concentration Risk [Line Items]" } } }, "localname": "ConcentrationRiskLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ConcentrationRiskTable": { "auth_ref": [ "r125", "r126", "r127", "r128", "r399", "r401" ], "lang": { "en-US": { "role": { "documentation": "Describes the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.", "label": "Concentration Risk [Table]", "terseLabel": "Concentration Risk [Table]" } } }, "localname": "ConcentrationRiskTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock": { "auth_ref": [ "r100", "r371" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.", "label": "Parent Company Only" } } }, "localname": "CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnly" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConsolidationPolicyTextBlock": { "auth_ref": [ "r91", "r374", "r377", "r378" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.", "label": "Consolidation" } } }, "localname": "ConsolidationPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConstructionLoansMember": { "auth_ref": [ "r514" ], "lang": { "en-US": { "role": { "documentation": "A borrowing arrangement which provides the entity constructing a facility (such as a building and a landfill) with funds to effect construction, generally on a draw down, or as needed, basis.", "label": "Real Estate Construction Loans [Member]" } } }, "localname": "ConstructionLoansMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ConsumerLoanMember": { "auth_ref": [ "r226" ], "lang": { "en-US": { "role": { "documentation": "Loan or extension of credit for personal, family, or household use excluding real estate.", "label": "Consumer Loan [Member]", "terseLabel": "Installment [Member]" } } }, "localname": "ConsumerLoanMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ContractualObligationFiscalYearMaturityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Contractual Obligation [Abstract]" } } }, "localname": "ContractualObligationFiscalYearMaturityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CorporateBondSecuritiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This category includes information about long-term debt securities that are issued by either a domestic or foreign corporate business entity with a date certain promise of repayment and a return to the holder for the time value of money (for example, variable or fixed interest, original issue discount).", "label": "Corporate Bond Securities [Member]", "terseLabel": "Corporate Bonds [Member]" } } }, "localname": "CorporateBondSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CorporateDebtSecuritiesMember": { "auth_ref": [ "r278", "r308", "r501" ], "lang": { "en-US": { "role": { "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.", "label": "Corporate Bonds [Member]" } } }, "localname": "CorporateDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.", "label": "Cumulative Effect of New Accounting Principle in Period of Adoption", "terseLabel": "Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect" } } }, "localname": "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CurrentFederalTaxExpenseBenefit": { "auth_ref": [ "r92", "r360", "r365" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 1.0, "parentTag": "us-gaap_CurrentIncomeTaxExpenseBenefit", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.", "label": "Federal" } } }, "localname": "CurrentFederalTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CurrentIncomeTaxExpenseBenefit": { "auth_ref": [ "r92", "r360", "r365" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 2.0, "parentTag": "us-gaap_IncomeTaxExpenseBenefit", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.", "label": "Current Income Tax Expense (Benefit)", "totalLabel": "Total current tax expense" } } }, "localname": "CurrentIncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Current tax expense [Abstract]" } } }, "localname": "CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CurrentStateAndLocalTaxExpenseBenefit": { "auth_ref": [ "r92", "r360", "r365" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 2.0, "parentTag": "us-gaap_CurrentIncomeTaxExpenseBenefit", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.", "label": "State" } } }, "localname": "CurrentStateAndLocalTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtAndEquitySecuritiesGainLoss": { "auth_ref": [ "r57", "r58" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 5.0, "parentTag": "us-gaap_Revenues", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of unrealized and realized gain (loss) on investment in debt and equity securities.", "label": "Net gain on securities transactions" } } }, "localname": "DebtAndEquitySecuritiesGainLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Short-Term Borrowings [Abstract]" } } }, "localname": "DebtDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Securities, Available-for-sale and Held-to-maturity [Abstract]" } } }, "localname": "DebtSecuritiesAvailableForSaleAndHeldToMaturityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "stringItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger": { "auth_ref": [ "r204", "r233", "r236" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": 1.0, "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "12 months or more - Fair Value" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": { "auth_ref": [ "r204", "r233" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": 1.0, "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "12 months or more - Gross Unrealized Loss" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months": { "auth_ref": [ "r204", "r233", "r236" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": 0.0, "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Less than 12 months - Fair Value" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": { "auth_ref": [ "r204", "r233" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": 0.0, "parentTag": "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Less than 12 months - Gross Unrealized Loss" } } }, "localname": "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleTable": { "auth_ref": [ "r209" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Debt Securities, Available-for-sale [Table]" } } }, "localname": "DebtSecuritiesAvailableForSaleTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition": { "auth_ref": [ "r201", "r230", "r236" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.", "label": "Debt Securities, Available-for-sale, Unrealized Loss Position", "totalLabel": "Total - Fair Value" } } }, "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPosition", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss": { "auth_ref": [ "r202", "r231" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss", "totalLabel": "Total - Gross Unrealized Loss" } } }, "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.", "label": "Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent", "terseLabel": "Liability related to awards" } } }, "localname": "DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredIncomeTaxExpenseBenefit": { "auth_ref": [ "r81", "r92", "r361", "r365" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 16.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 1.0, "parentTag": "us-gaap_IncomeTaxExpenseBenefit", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.", "label": "Deferred tax expense (benefit)", "terseLabel": "Deferred tax expense" } } }, "localname": "DeferredIncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsLiabilitiesNet": { "auth_ref": [ "r356" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.", "label": "Deferred Tax Assets, Net", "periodEndLabel": "Net deferred tax asset at end of year", "periodStartLabel": "Net deferred tax asset at beginning of year" } } }, "localname": "DeferredTaxAssetsLiabilitiesNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.", "label": "Deferred Tax Assets, Property, Plant and Equipment", "negatedLabel": "Depreciable assets" } } }, "localname": "DeferredTaxAssetsPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits": { "auth_ref": [ "r344", "r358", "r359" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.", "label": "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits", "negatedLabel": "Benefits and deferred remuneration" } } }, "localname": "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses": { "auth_ref": [ "r344", "r358", "r359" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.", "label": "Difference in reporting the allowance for loan losses, net" } } }, "localname": "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross": { "auth_ref": [ "r345", "r358" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.", "label": "Deferred tax assets, unrealized losses on available-for-sale securities" } } }, "localname": "DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment": { "auth_ref": [ "r345", "r358", "r359" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.", "label": "Deferred Tax Liabilities, Property, Plant and Equipment", "terseLabel": "Deferred tax liabilities, fixed assets temporary differences" } } }, "localname": "DeferredTaxLiabilitiesPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Defined Benefit Plan [Abstract]", "terseLabel": "Benefit Plans [Abstract]" } } }, "localname": "DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation": { "auth_ref": [ "r280" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.", "label": "Accumulated benefit obligation for pension benefits", "periodEndLabel": "Accumulated benefit obligation at end of year", "periodStartLabel": "Accumulated benefit obligation at beginning of year" } } }, "localname": "DefinedBenefitPlanAccumulatedBenefitObligation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax": { "auth_ref": [ "r41", "r290" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.", "label": "Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax", "negatedLabel": "Net actuarial loss" } } }, "localname": "DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets": { "auth_ref": [ "r272", "r308" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.", "label": "Actual (loss) gain on plan assets" } } }, "localname": "DefinedBenefitPlanActualReturnOnPlanAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanActuarialGainLoss": { "auth_ref": [ "r269" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.", "label": "Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)", "negatedLabel": "Net actuarial loss (gain)" } } }, "localname": "DefinedBenefitPlanActuarialGainLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses": { "auth_ref": [ "r286", "r305", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 3.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.", "label": "Defined Benefit Plan, Amortization of Gain (Loss)", "negatedLabel": "Amortization of net loss (gain)" } } }, "localname": "DefinedBenefitPlanAmortizationOfGainsLosses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit": { "auth_ref": [ "r287", "r306", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 4.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.", "label": "Defined Benefit Plan, Amortization of Prior Service Cost (Credit)", "verboseLabel": "Amortization of prior service (credit) cost" } } }, "localname": "DefinedBenefitPlanAmortizationOfPriorServiceCostCredit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Amounts recognized in accumulated other comprehensive loss [Abstract]" } } }, "localname": "DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax": { "auth_ref": [ "r32", "r37", "r288" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.", "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax", "negatedTotalLabel": "Total recognized in other comprehensive (loss) income" } } }, "localname": "DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAssetsTargetAllocationsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets target allocations [Abstract]" } } }, "localname": "DefinedBenefitPlanAssetsTargetAllocationsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate": { "auth_ref": [ "r292" ], "lang": { "en-US": { "role": { "documentation": "Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.", "label": "Discount rate" } } }, "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate": { "auth_ref": [ "r292" ], "lang": { "en-US": { "role": { "documentation": "Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.", "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate", "terseLabel": "Discount rate" } } }, "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets": { "auth_ref": [ "r293" ], "lang": { "en-US": { "role": { "documentation": "Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.", "label": "Expected long-term rate of return on assets" } } }, "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assumptions used to determine benefit obligation [Abstract]" } } }, "localname": "DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanBenefitObligation": { "auth_ref": [ "r266" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.", "label": "Defined Benefit Plan, Benefit Obligation", "periodEndLabel": "Projected benefit obligation at end of year", "periodStartLabel": "Projected benefit obligation at beginning of year" } } }, "localname": "DefinedBenefitPlanBenefitObligation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid": { "auth_ref": [ "r270", "r311" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.", "label": "Defined Benefit Plan, Benefit Obligation, Benefits Paid", "negatedLabel": "Benefits paid" } } }, "localname": "DefinedBenefitPlanBenefitObligationBenefitsPaid", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis": { "auth_ref": [ "r278", "r279", "r295", "r308" ], "lang": { "en-US": { "role": { "documentation": "Information by defined benefit plan asset investment.", "label": "Defined Benefit Plan, Asset Categories [Axis]" } } }, "localname": "DefinedBenefitPlanByPlanAssetCategoriesAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Change in benefit obligation [Roll Forward]" } } }, "localname": "DefinedBenefitPlanChangeInBenefitObligationRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Change in plan assets and reconciliation of funded status [Roll Forward]" } } }, "localname": "DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanContributionsByEmployer": { "auth_ref": [ "r273", "r278", "r279", "r307", "r308" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of contribution received by defined benefit plan from employer which increases plan assets.", "label": "Defined Benefit Plan, Plan Assets, Contributions by Employer", "terseLabel": "Company contributions" } } }, "localname": "DefinedBenefitPlanContributionsByEmployer", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanDebtSecurityMember": { "auth_ref": [ "r278" ], "lang": { "en-US": { "role": { "documentation": "Debt instrument issued by corporation, government and governmental agency, municipality, and other institution; in which defined benefit plan asset is invested.", "label": "Defined Benefit Plan, Debt Security [Member]", "verboseLabel": "Debt Securities [Member]" } } }, "localname": "DefinedBenefitPlanDebtSecurityMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DefinedBenefitPlanDisclosureLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Benefit Plan Disclosure [Line Items]" } } }, "localname": "DefinedBenefitPlanDisclosureLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Effect of one-percentage point change in assumed health care cost trend rates [Abstract]" } } }, "localname": "DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1": { "auth_ref": [ "r294" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.", "label": "Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation", "negatedLabel": "Effect of one percentage point decrease on in assumed health care cost" } } }, "localname": "DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1": { "auth_ref": [ "r294" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.", "label": "Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components", "negatedLabel": "Effect of one percentage point decrease on in interest and service components" } } }, "localname": "DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation": { "auth_ref": [ "r294" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.", "label": "Effect of one percentage point increase on in assumed health care cost" } } }, "localname": "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents": { "auth_ref": [ "r294" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.", "label": "Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components", "terseLabel": "Effect of one percentage point increase on in interest and service components" } } }, "localname": "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanEquitySecuritiesMember": { "auth_ref": [ "r278", "r308" ], "lang": { "en-US": { "role": { "documentation": "Security representing ownership in corporation or other legal entity for which ownership is represented by share of stock, in which defined benefit plan asset is invested. Includes, but is not limited to, common stock, preferred stock, convertible security, stock right and stock warrant.", "label": "Defined Benefit Plan, Equity Securities [Member]", "terseLabel": "Equity Securities [Member]" } } }, "localname": "DefinedBenefitPlanEquitySecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Estimated future benefit payments [Abstract]" } } }, "localname": "DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear": { "auth_ref": [ "r296" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.", "label": "Amounts of Net Gain that will be amortized from accumulated other comprehensive income (loss) in next fiscal year" } } }, "localname": "DefinedBenefitPlanExpectedAmortizationNextFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear": { "auth_ref": [ "r296" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.", "label": "Amount of prior service credit that will be amortized from accumulated other comprehensive income (loss) in next fiscal year" } } }, "localname": "DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter", "terseLabel": "2025 - 2029" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months", "terseLabel": "2020" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Five", "terseLabel": "2024" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Four", "terseLabel": "2023" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Three", "terseLabel": "2022" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo": { "auth_ref": [ "r281" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.", "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Two", "terseLabel": "2021" } } }, "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": { "auth_ref": [ "r285", "r304", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 2.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.", "label": "Defined Benefit Plan, Expected Return (Loss) on Plan Assets", "negatedTerseLabel": "Expected return on plan assets" } } }, "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanFairValueOfPlanAssets": { "auth_ref": [ "r271", "r278", "r279", "r308" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.", "label": "Fair value of plan assets", "periodEndLabel": "Fair value of plan assets at end of year", "periodStartLabel": "Fair Value of plan assets at beginning of year" } } }, "localname": "DefinedBenefitPlanFairValueOfPlanAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanFundedStatusOfPlan": { "auth_ref": [ "r265", "r275" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.", "label": "Defined Benefit Plan, Funded (Unfunded) Status of Plan", "periodEndLabel": "Funded status at end of year" } } }, "localname": "DefinedBenefitPlanFundedStatusOfPlan", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanInterestCost": { "auth_ref": [ "r268", "r284", "r303", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 1.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost recognized for passage of time related to defined benefit plan.", "label": "Interest cost", "terseLabel": "Interest cost" } } }, "localname": "DefinedBenefitPlanInterestCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": { "auth_ref": [ "r282", "r301", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan.", "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit)", "totalLabel": "Net periodic pension credit" } } }, "localname": "DefinedBenefitPlanNetPeriodicBenefitCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Components of the net periodic pension income and other amounts recognized in other comprehensive (loss) income [Abstract]" } } }, "localname": "DefinedBenefitPlanNetPeriodicBenefitCostAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid": { "auth_ref": [ "r274", "r311" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.", "label": "Defined Benefit Plan, Plan Assets, Benefits Paid", "negatedLabel": "Benefits paid" } } }, "localname": "DefinedBenefitPlanPlanAssetsBenefitsPaid", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage": { "auth_ref": [ "r277", "r308" ], "lang": { "en-US": { "role": { "documentation": "Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.", "label": "Defined Benefit Plan, Plan Assets, Target Allocation, Percentage", "terseLabel": "Target allocations range" } } }, "localname": "DefinedBenefitPlanPlanAssetsTargetAllocationPercentage", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedBenefitPlanServiceCost": { "auth_ref": [ "r267", "r283", "r302", "r308" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 0.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.", "label": "Service cost", "terseLabel": "Service cost" } } }, "localname": "DefinedBenefitPlanServiceCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations": { "auth_ref": [ "r277" ], "lang": { "en-US": { "role": { "documentation": "Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.", "label": "Total asset allocation" } } }, "localname": "DefinedBenefitPlanWeightedAverageAssetAllocations", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assumptions used to determine net periodic pension expense [Abstract]" } } }, "localname": "DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable": { "auth_ref": [ "r297", "r298", "r299", "r300", "r308" ], "lang": { "en-US": { "role": { "documentation": "Disclosures and provisions pertaining to defined benefit pension plans or other postretirement defined benefit plans. The arrangements are generally based on terms and conditions stipulated by the entity, and which contain a promise by the employer to pay certain amounts or awards at designated future dates, including a period after retirement, upon compliance with stipulated requirements. Excludes disclosures pertaining to defined contribution plans.", "label": "Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]" } } }, "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]" } } }, "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedContributionPlanCostRecognized": { "auth_ref": [ "r312" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost for defined contribution plan.", "label": "Expense related to 401(k) plan" } } }, "localname": "DefinedContributionPlanCostRecognized", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedContributionPlanDisclosureLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Contribution Plan Disclosure [Line Items]" } } }, "localname": "DefinedContributionPlanDisclosureLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedContributionPlanTable": { "auth_ref": [ "r312" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans.", "label": "Defined Contribution Plan [Table]" } } }, "localname": "DefinedContributionPlanTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DemandDepositAccounts": { "auth_ref": [ "r446" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 0.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.", "label": "Demand Deposit Accounts", "terseLabel": "Demand" } } }, "localname": "DemandDepositAccounts", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositLiabilitiesDisclosuresTextBlock": { "auth_ref": [ "r446", "r472" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for deposit liabilities including data and tables. It may include a description of the entity's deposit liabilities, the aggregate amount of time deposits (including certificates of deposit) in denominations of $100,000 or more at the balance sheet date; the aggregate amount of any demand deposits that have been reclassified as loan balances, such as overdrafts, at the balance sheet date; deposits that are received on terms other than those in the normal course of business, the amount of accrued interest on deposit liabilities; securities, mortgage loans or other financial instruments that serve as collateral for deposits; for time deposits having a remaining term of more than one year, the aggregate amount of maturities for each of the five years following the balance sheet date; and the weighted average interest rate for all deposit liabilities held by the entity.", "label": "Deposit Liabilities Disclosures [Text Block]", "terseLabel": "Deposits" } } }, "localname": "DepositLiabilitiesDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/Deposits" ], "xbrltype": "textBlockItemType" }, "us-gaap_Deposits": { "auth_ref": [ "r446" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 0.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.", "label": "Deposits", "totalLabel": "Total deposits" } } }, "localname": "Deposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Deposits [Abstract]", "verboseLabel": "Deposits:" } } }, "localname": "DepositsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "stringItemType" }, "us-gaap_DepositsMoneyMarketDeposits": { "auth_ref": [ "r446" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 3.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.", "label": "Money market deposit accounts" } } }, "localname": "DepositsMoneyMarketDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositsNegotiableOrderOfWithdrawalNOW": { "auth_ref": [ "r446" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.", "label": "Interest-bearing checking" } } }, "localname": "DepositsNegotiableOrderOfWithdrawalNOW", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositsSavingsDeposits": { "auth_ref": [ "r446" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).", "label": "Deposits, Savings Deposits", "verboseLabel": "Savings accounts" } } }, "localname": "DepositsSavingsDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_Depreciation": { "auth_ref": [ "r81", "r237" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.", "label": "Depreciation", "terseLabel": "Depreciation and amortization expense" } } }, "localname": "Depreciation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepreciationAmortizationAndAccretionNet": { "auth_ref": [ "r81" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.", "label": "Depreciation and amortization" } } }, "localname": "DepreciationAmortizationAndAccretionNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_DisaggregationOfRevenueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Sources of non-interest income [Abstract]" } } }, "localname": "DisaggregationOfRevenueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Disaggregation of Revenue [Line Items]" } } }, "localname": "DisaggregationOfRevenueLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Disaggregation of Revenue [Table]" } } }, "localname": "DisaggregationOfRevenueTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTableTextBlock": { "auth_ref": [ "r257" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Source of Non-Interest Income" } } }, "localname": "DisaggregationOfRevenueTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisclosureOfRestrictionsOnDividendsLoansAndAdvancesDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Dividend Restrictions [Abstract]" } } }, "localname": "DisclosureOfRestrictionsOnDividendsLoansAndAdvancesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DividendsCommonStockCash": { "auth_ref": [ "r253" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.", "label": "Dividends, Common Stock, Cash", "negatedLabel": "Cash dividend declared" } } }, "localname": "DividendsCommonStockCash", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_DueFromOfficersOrStockholders": { "auth_ref": [ "r97", "r424", "r426", "r495" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "For an unclassified balance sheet, amounts due from owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company.", "label": "Due from officers" } } }, "localname": "DueFromOfficersOrStockholders", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Earnings Per Share [Abstract]", "verboseLabel": "Earnings per share:" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasic": { "auth_ref": [ "r56", "r103", "r111", "r113", "r114", "r115", "r119", "r453", "r497" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.", "label": "Basic (in dollars per share)", "terseLabel": "Basic EPS (in dollars per share)" } } }, "localname": "EarningsPerShareBasic", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareBasicAndDilutedAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Reconciliation of the component parts of earnings per share [Abstract]" } } }, "localname": "EarningsPerShareBasicAndDilutedAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareDiluted": { "auth_ref": [ "r56", "r103", "r111", "r113", "r114", "r115", "r119", "r453", "r497" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.", "label": "Diluted (in dollars per share)", "verboseLabel": "Diluted EPS (in dollars per share)" } } }, "localname": "EarningsPerShareDiluted", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerSharePolicyTextBlock": { "auth_ref": [ "r91", "r116", "r117", "r118" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.", "label": "Earnings Per Share" } } }, "localname": "EarningsPerSharePolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_EarningsPerShareTextBlock": { "auth_ref": [ "r120" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for earnings per share.", "label": "Earnings Per Share [Text Block]", "verboseLabel": "Earnings Per Share" } } }, "localname": "EarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShare" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperations": { "auth_ref": [ "r96", "r349", "r350" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "lang": { "en-US": { "role": { "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Effective Income Tax Rate Reconciliation, Percent", "totalLabel": "Effective income tax rate" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperations", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Reconciliation from statutory federal income tax rate to effective tax rate [Abstract]" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate": { "auth_ref": [ "r349", "r350", "r364" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 1.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Percentage of domestic federal statutory tax rate applicable to pretax income (loss).", "label": "Statutory federal income tax rate" } } }, "localname": "EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate": { "auth_ref": [ "r349", "r350", "r364" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 5.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.", "label": "Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent", "terseLabel": "Enactment of Federal Tax Reform" } } }, "localname": "EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments": { "auth_ref": [ "r349", "r350", "r364" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 4.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.", "label": "Other items" } } }, "localname": "EffectiveIncomeTaxRateReconciliationOtherAdjustments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes": { "auth_ref": [ "r349", "r350", "r364" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 3.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).", "label": "State income tax, net of federal tax benefit" } } }, "localname": "EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome": { "auth_ref": [ "r349", "r350", "r364" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 2.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": -1.0 } }, "lang": { "en-US": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.", "label": "Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent", "negatedLabel": "Tax exempt income" } } }, "localname": "EffectiveIncomeTaxRateReconciliationTaxExemptIncome", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]" } } }, "localname": "EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized [Abstract]" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": { "auth_ref": [ "r337" ], "lang": { "en-US": { "role": { "documentation": "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Unrecognized compensation expense, period of recognition" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions": { "auth_ref": [ "r337" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.", "label": "Unrecognized stock-based compensation expense" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions": { "auth_ref": [ "r337" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost to be recognized for option under share-based payment arrangement.", "label": "Unrecognized stock-based compensation expense related to non-vested stock options" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeStockOptionMember": { "auth_ref": [ "r336" ], "lang": { "en-US": { "role": { "documentation": "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.", "label": "Stock Options [Member]" } } }, "localname": "EmployeeStockOptionMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails", "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquipmentExpense": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 3.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Equipment expense" } } }, "localname": "EquipmentExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r252" ], "lang": { "en-US": { "role": { "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.", "label": "Equity Component [Domain]" } } }, "localname": "EquityComponentDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_EquityFundsMember": { "auth_ref": [ "r278" ], "lang": { "en-US": { "role": { "documentation": "An investment that pools funds from many investors to invest in a combination of underlying investments, primarily equity investments.", "label": "Equity Mutual Funds [Member]" } } }, "localname": "EquityFundsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EstimateOfFairValueFairValueDisclosureMember": { "auth_ref": [ "r396" ], "lang": { "en-US": { "role": { "documentation": "Measured as an estimate of fair value.", "label": "Estimate of Fair Value Measurement [Member]", "terseLabel": "Carrying Value [Member]" } } }, "localname": "EstimateOfFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets and liabilities measured at fair value on a recurring basis [Abstract]", "verboseLabel": "Assets measured at fair value on a non-recurring basis [Abstract]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": { "auth_ref": [ "r382", "r383", "r384", "r390" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.", "label": "Fair Value Measurements, Recurring and Nonrecurring [Table]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount": { "auth_ref": [ "r384" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.", "label": "Fair value assets transfers from Level 1 to Level 2" } } }, "localname": "FairValueAssetsLevel1ToLevel2TransfersAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount": { "auth_ref": [ "r384" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.", "label": "Fair value assets transfers from Level 2 to Level 1" } } }, "localname": "FairValueAssetsLevel2ToLevel1TransfersAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock": { "auth_ref": [ "r382", "r383", "r385" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).", "label": "Assets Measured at Fair Value on Non-Recurring Basis" } } }, "localname": "FairValueAssetsMeasuredOnNonrecurringBasisTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock": { "auth_ref": [ "r382", "r383" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).", "label": "Assets and Liabilities Measured at Fair Value on Recurring Basis" } } }, "localname": "FairValueAssetsMeasuredOnRecurringBasisTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]" } } }, "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTable": { "auth_ref": [ "r382", "r397", "r398" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.", "label": "Fair Value, by Balance Sheet Grouping [Table]" } } }, "localname": "FairValueByBalanceSheetGroupingTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTextBlock": { "auth_ref": [ "r382", "r397" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.", "label": "Carrying Amounts and Estimated Fair Values of Financial Instruments" } } }, "localname": "FairValueByBalanceSheetGroupingTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r278", "r279", "r308", "r383", "r428" ], "lang": { "en-US": { "role": { "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.", "label": "Fair Value Hierarchy and NAV [Axis]" } } }, "localname": "FairValueByFairValueHierarchyLevelAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementBasisAxis": { "auth_ref": [ "r382", "r391" ], "lang": { "en-US": { "role": { "documentation": "Information by measurement basis.", "label": "Measurement Basis [Axis]" } } }, "localname": "FairValueByMeasurementBasisAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementFrequencyAxis": { "auth_ref": [ "r382", "r383", "r386", "r387", "r392" ], "lang": { "en-US": { "role": { "documentation": "Information by measurement frequency.", "label": "Measurement Frequency [Axis]" } } }, "localname": "FairValueByMeasurementFrequencyAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueConcentrationOfRiskTextBlock": { "auth_ref": [ "r399", "r401", "r402", "r403" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.", "label": "Fair Value, Concentration of Risk [Table Text Block]", "terseLabel": "Securities Held in Available For Sale and Held to Maturity Greater Than 10% of Shareholders Equity" } } }, "localname": "FairValueConcentrationOfRiskTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueDisclosureItemAmountsDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value.", "label": "Fair Value Measurement [Domain]" } } }, "localname": "FairValueDisclosureItemAmountsDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability": { "auth_ref": [ "r396" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.", "label": "Off-balance sheet risks, amount" } } }, "localname": "FairValueDisclosureOffbalanceSheetRisksAmountLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Fair Value [Abstract]" } } }, "localname": "FairValueDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresTextBlock": { "auth_ref": [ "r389" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.", "label": "Fair Value Disclosures [Text Block]", "verboseLabel": "Fair Value" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValue" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueInputsLevel1Member": { "auth_ref": [ "r278", "r279", "r308", "r383", "r429" ], "lang": { "en-US": { "role": { "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.", "label": "Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]", "verboseLabel": "Level 1 [Member]" } } }, "localname": "FairValueInputsLevel1Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r278", "r279", "r308", "r383", "r430" ], "lang": { "en-US": { "role": { "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.", "label": "Significant Other Observable Inputs (Level 2) [Member]", "verboseLabel": "Level 2 [Member]" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel3Member": { "auth_ref": [ "r278", "r279", "r308", "r383", "r431" ], "lang": { "en-US": { "role": { "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.", "label": "Significant Unobservable Inputs (Level 3) [Member]", "verboseLabel": "Level 3 [Member]" } } }, "localname": "FairValueInputsLevel3Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementFrequencyDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement frequency.", "label": "Fair Value, Measurement Frequency [Domain]" } } }, "localname": "FairValueMeasurementFrequencyDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.", "label": "Fair Value Hierarchy and NAV [Domain]" } } }, "localname": "FairValueMeasurementsFairValueHierarchyDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsNonrecurringMember": { "auth_ref": [ "r382", "r383", "r386", "r387", "r388", "r392" ], "lang": { "en-US": { "role": { "documentation": "Infrequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, not frequently measured at fair value.", "label": "Nonrecurring [Member]" } } }, "localname": "FairValueMeasurementsNonrecurringMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsRecurringMember": { "auth_ref": [ "r389", "r392" ], "lang": { "en-US": { "role": { "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.", "label": "Recurring [Member]" } } }, "localname": "FairValueMeasurementsRecurringMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueOfFinancialInstrumentsPolicy": { "auth_ref": [ "r91", "r393", "r395" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for determining the fair value of financial instruments.", "label": "Fair Value of Financial Instruments" } } }, "localname": "FairValueOfFinancialInstrumentsPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]" } } }, "localname": "FairValueOffBalanceSheetRisksDisclosureInformationLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 3.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.", "label": "Federal Reserve Bank and Federal Home Loan Bank stock" } } }, "localname": "FederalHomeLoanBankStockAndFederalReserveBankStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLoansAndLeasesReceivablePolicy": { "auth_ref": [ "r144", "r155", "r159", "r167", "r172", "r176", "r177", "r178" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for financing receivable.", "label": "Financing Receivable [Policy Text Block]", "terseLabel": "Loans" } } }, "localname": "FinanceLoansAndLeasesReceivablePolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinancialInstrumentAxis": { "auth_ref": [ "r211", "r214", "r215", "r218", "r219", "r232", "r234", "r235", "r236" ], "lang": { "en-US": { "role": { "documentation": "Information by type of financial instrument.", "label": "Financial Instrument [Axis]", "terseLabel": "Financial Instrument [Axis]" } } }, "localname": "FinancialInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails", "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financial assets [Abstract]" } } }, "localname": "FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financial liabilities [Abstract]" } } }, "localname": "FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment": { "auth_ref": [ "r149" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.", "label": "Collectively evaluated for impairment" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1": { "auth_ref": [ "r149" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.", "label": "Individually evaluated for impairment" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Financing Receivable, Allowance for Credit Losses [Line Items]" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery": { "auth_ref": [ "r148", "r213", "r226", "r443" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of recovery of financing receivables doubtful of collection that were previously charged off.", "label": "Total recoveries" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesRecovery", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Allowance for loan losses by portfolio segment [Roll Forward]" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs": { "auth_ref": [ "r147", "r212", "r226", "r443" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of writeoff of financing receivable, charged against allowance for credit loss.", "label": "Total loan charge offs" } } }, "localname": "FinancingReceivableAllowanceForCreditLossesWriteOffs", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment": { "auth_ref": [ "r150" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The balance of financing receivables that were collectively evaluated for impairment.", "label": "Financing Receivable, Collectively Evaluated for Impairment", "verboseLabel": "Collectively evaluated for impairment" } } }, "localname": "FinancingReceivableCollectivelyEvaluatedForImpairment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock": { "auth_ref": [ "r160", "r219" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.", "label": "Risk Category Loans by Class of Loans" } } }, "localname": "FinancingReceivableCreditQualityIndicatorsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinancingReceivableImpairedLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Financing Receivable, Impaired [Line Items]" } } }, "localname": "FinancingReceivableImpairedLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment": { "auth_ref": [ "r150" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The balance of financing receivables that were individually evaluated for impairment.", "label": "Financing Receivable, Individually Evaluated for Impairment", "verboseLabel": "Individually evaluated for impairment" } } }, "localname": "FinancingReceivableIndividuallyEvaluatedForImpairment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Financing Receivable, Modifications [Line Items]" } } }, "localname": "FinancingReceivableModificationsLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableModificationsNumberOfContracts2": { "auth_ref": [ "r162" ], "lang": { "en-US": { "role": { "documentation": "Number of financing receivables that have been modified by troubled debt restructurings.", "label": "Financing Receivable, Modifications, Number of Contracts", "verboseLabel": "Number of Contracts" } } }, "localname": "FinancingReceivableModificationsNumberOfContracts2", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "integerItemType" }, "us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2": { "auth_ref": [ "r162" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after troubled debt restructuring, of modified financing receivable.", "label": "Financing Receivable, Troubled Debt Restructuring, Postmodification", "verboseLabel": "Post-Modification Outstanding Recorded Investment" } } }, "localname": "FinancingReceivableModificationsPostModificationRecordedInvestment2", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2": { "auth_ref": [ "r162" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before troubled debt restructuring, of financing receivable to be modified.", "label": "Financing Receivable, Troubled Debt Restructuring, Premodification", "verboseLabel": "Pre-Modification Outstanding Recorded Investment" } } }, "localname": "FinancingReceivableModificationsPreModificationRecordedInvestment2", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1": { "auth_ref": [ "r164" ], "lang": { "en-US": { "role": { "documentation": "Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.", "label": "Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts", "verboseLabel": "Number of Contracts" } } }, "localname": "FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "integerItemType" }, "us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1": { "auth_ref": [ "r163" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.", "label": "Financing Receivable, Troubled Debt Restructuring, Subsequent Default", "verboseLabel": "Recorded Investment" } } }, "localname": "FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivablePortfolioSegmentAxis": { "auth_ref": [ "r211", "r214", "r220" ], "lang": { "en-US": { "role": { "documentation": "Information by the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.", "label": "Financing Receivable Portfolio Segment [Axis]" } } }, "localname": "FinancingReceivablePortfolioSegmentAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivablePortfolioSegmentDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.", "label": "Financing Receivable Portfolio Segment [Domain]" } } }, "localname": "FinancingReceivablePortfolioSegmentDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing": { "auth_ref": [ "r169", "r217", "r227" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of financing receivable 90 days or more past due and still accruing.", "label": "Loans that are 90 days past due and still accruing interest" } } }, "localname": "FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Aging of the recorded investment in past due loans [Abstract]" } } }, "localname": "FinancingReceivableRecordedInvestmentAgingAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis": { "auth_ref": [ "r161", "r170", "r171", "r215", "r218", "r219", "r221", "r222", "r226", "r227" ], "lang": { "en-US": { "role": { "documentation": "Information by class of financing receivable determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.", "label": "Class of Financing Receivable, Type [Axis]", "terseLabel": "Class of Financing Receivable [Axis]" } } }, "localname": "FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Financing receivables determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.", "label": "Class of Financing Receivable, Type [Domain]", "terseLabel": "Class of Financing Receivable [Domain]" } } }, "localname": "FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentCurrent": { "auth_ref": [ "r215", "r227" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of financing receivable not past due.", "label": "Current" } } }, "localname": "FinancingReceivableRecordedInvestmentCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Financing Receivable, Recorded Investment [Line Items]" } } }, "localname": "FinancingReceivableRecordedInvestmentLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus": { "auth_ref": [ "r168", "r216" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of financing receivable on nonaccrual status.", "label": "Total non-accrual loans" } } }, "localname": "FinancingReceivableRecordedInvestmentNonaccrualStatus", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentPastDue": { "auth_ref": [ "r171", "r215", "r227" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of financing receivable past due.", "label": "Financing Receivable, Past Due", "terseLabel": "Total 30+ days Past Due" } } }, "localname": "FinancingReceivableRecordedInvestmentPastDue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Financing Receivable, Recorded Investment, Past Due [Line Items]" } } }, "localname": "FinancingReceivableRecordedInvestmentPastDueLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivableTroubledDebtRestructuringAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financing Receivable, Troubled Debt Restructuring [Abstract]", "verboseLabel": "Modified loans by class determined to be TDR's [Abstract]" } } }, "localname": "FinancingReceivableTroubledDebtRestructuringAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivables30To59DaysPastDueMember": { "auth_ref": [ "r227" ], "lang": { "en-US": { "role": { "documentation": "Financial asset more than 29 days past due but fewer than 60 days past due.", "label": "30 to 59 Days Past Due [Member]" } } }, "localname": "FinancingReceivables30To59DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivables60To89DaysPastDueMember": { "auth_ref": [ "r227" ], "lang": { "en-US": { "role": { "documentation": "Financial asset more than 59 days past due but fewer than 90 days past due.", "label": "60 to 89 Days Past Due [Member]" } } }, "localname": "FinancingReceivables60To89DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember": { "auth_ref": [ "r227" ], "lang": { "en-US": { "role": { "documentation": "Financial asset equal to or greater than 90 days past due.", "label": "90+ Days Past Due [Member]" } } }, "localname": "FinancingReceivablesEqualToGreaterThan90DaysPastDueMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivablesPeriodPastDueAxis": { "auth_ref": [ "r215", "r227" ], "lang": { "en-US": { "role": { "documentation": "Information by time period financial asset is past due.", "label": "Financing Receivables, Period Past Due [Axis]" } } }, "localname": "FinancingReceivablesPeriodPastDueAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancingReceivablesPeriodPastDueDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Period in which financial asset is past due. Element name and standard label in Financial Asset, [numeric lower end] to [numeric higher end] [date measure] Past Due [Member] or Financial Asset, Greater Than [low end numeric value] [date measure] Past Due [Member] or Financial Asset, Less Than [high end numeric value] [date measure] Past Due [Member] formats.", "label": "Financing Receivables, Period Past Due [Domain]" } } }, "localname": "FinancingReceivablesPeriodPastDueDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinancingReceivablesTextBlock": { "auth_ref": [ "r175", "r179" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for financing receivable.", "label": "Financing Receivables [Text Block]", "verboseLabel": "Loans and Allowance for Loan Losses" } } }, "localname": "FinancingReceivablesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLosses" ], "xbrltype": "textBlockItemType" }, "us-gaap_FirstMortgageMember": { "auth_ref": [ "r514" ], "lang": { "en-US": { "role": { "documentation": "Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower.", "label": "First Mortgages [Member]" } } }, "localname": "FirstMortgageMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FixedIncomeFundsMember": { "auth_ref": [ "r278" ], "lang": { "en-US": { "role": { "documentation": "Investment that pools funds from investors to invest in a combination of underlying investments, primarily fixed income investments.", "label": "Fixed Income Mutual Funds [Member]" } } }, "localname": "FixedIncomeFundsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FurnitureAndFixturesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.", "label": "Furniture, Fixtures and Equipment [Member]" } } }, "localname": "FurnitureAndFixturesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": { "auth_ref": [ "r81" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 9.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.", "label": "Gain (Loss) on Disposition of Property Plant Equipment", "negatedLabel": "Net (gain) loss on sale of bank premises and equipment" } } }, "localname": "GainLossOnSaleOfPropertyPlantEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainsLossesOnSalesOfOtherRealEstate": { "auth_ref": [ "r461" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.", "label": "Gains (Losses) on Sales of Other Real Estate", "negatedLabel": "Net gain on sale of other real estate owned" } } }, "localname": "GainsLossesOnSalesOfOtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecurities": { "auth_ref": [ "r181", "r194" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_Assets", "weight": 1.0 }, "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held to maturity securities ($19,680 and $22,924 fair value at December 31, 2019 and 2018, respectively)", "terseLabel": "Amortized Cost", "totalLabel": "Amortized Cost" } } }, "localname": "HeldToMaturitySecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Amortized cost and fair value of the held to maturity securities [Abstract]" } } }, "localname": "HeldToMaturitySecuritiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain": { "auth_ref": [ "r196" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails": { "order": 0.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).", "label": "Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain", "verboseLabel": "Gross Unrecognized Gains" } } }, "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss": { "auth_ref": [ "r197" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails": { "order": 1.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).", "label": "Gross Unrecognized Losses" } } }, "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": { "auth_ref": [ "r202", "r204" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.", "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss", "terseLabel": "Less than 12 months - Gross unrealized Loss" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": { "auth_ref": [ "r204" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.", "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value", "terseLabel": "Less than 12 months - Fair value" } } }, "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Held to maturity portfolio based on contractual maturity [Abstract]" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]", "verboseLabel": "Fair Value [Abstract]" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]", "verboseLabel": "Amortized Cost [Abstract]" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue": { "auth_ref": [ "r198" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.", "label": "Securities, fair value" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount": { "auth_ref": [ "r198" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.", "label": "Securities, amortized cost" } } }, "localname": "HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesFairValue": { "auth_ref": [ "r195" ], "calculation": { "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails": { "order": 2.0, "parentTag": "us-gaap_HeldToMaturitySecurities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity).", "label": "Held to maturity securities, fair value", "terseLabel": "Fair Value" } } }, "localname": "HeldToMaturitySecuritiesFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HeldToMaturitySecuritiesTextBlock": { "auth_ref": [ "r199" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).", "label": "Amortized Cost and Fair Value of Held to Maturity Securities" } } }, "localname": "HeldToMaturitySecuritiesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_HeldtomaturitySecuritiesMember": { "auth_ref": [ "r206" ], "lang": { "en-US": { "role": { "documentation": "Investments in debt securities classified as held-to-maturity.", "label": "Held to Maturity Securities [Member]" } } }, "localname": "HeldtomaturitySecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "domainItemType" }, "us-gaap_HomeEquityLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loan based on the equity of the borrower's residential property in which the borrower receives the loan amount upfront. Excludes home equity lines of credit.", "label": "Home Equity Loans [Member]" } } }, "localname": "HomeEquityLoanMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_HomeEquityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revolving, open-end loan extended under a line of credit and secured by the borrower's residential property.", "label": "Home Equity Line of Credit [Member]", "verboseLabel": "Home Equity Lines of Credit [Member]" } } }, "localname": "HomeEquityMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment": { "auth_ref": [ "r156", "r158" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.", "label": "Average Recorded Investment" } } }, "localname": "ImpairedFinancingReceivableAverageRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableRecordedInvestment": { "auth_ref": [ "r152" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.", "label": "Impaired loans", "verboseLabel": "Recorded Investment" } } }, "localname": "ImpairedFinancingReceivableRecordedInvestment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableRelatedAllowance": { "auth_ref": [ "r153" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of allowance for credit losses related to recorded investment.", "label": "Impaired Financing Receivable, Related Allowance", "verboseLabel": "Related Allowance" } } }, "localname": "ImpairedFinancingReceivableRelatedAllowance", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance": { "auth_ref": [ "r154" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.", "label": "Unpaid Principal Balance" } } }, "localname": "ImpairedFinancingReceivableUnpaidPrincipalBalance", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairedFinancingReceivablesTableTextBlock": { "auth_ref": [ "r157" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of impaired financing receivables.", "label": "Impaired Loans by Loan Class" } } }, "localname": "ImpairedFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ImpairmentOfRealEstate": { "auth_ref": [ "r81", "r241" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 13.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The charge against earnings in the period to reduce the carrying amount of real property to fair value.", "label": "Impairment of Real Estate", "terseLabel": "Writedown of other real estate owned" } } }, "localname": "ImpairmentOfRealEstate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r95" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.", "label": "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest", "terseLabel": "Income before income taxes and subsidiaries' undistributed earnings", "totalLabel": "Income before income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions": { "auth_ref": [ "r81" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.", "label": "Income (Loss) from Equity Method Investments, Net of Dividends or Distributions", "negatedTerseLabel": "Equity in undistributed earnings of subsidiaries", "terseLabel": "Equity in undistributed earnings of subsidiaries" } } }, "localname": "IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeStatementAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Consolidated Statements of Income [Abstract]" } } }, "localname": "IncomeStatementAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxAuthorityAxis": { "auth_ref": [ "r351" ], "lang": { "en-US": { "role": { "documentation": "Information by tax jurisdiction.", "label": "Income Tax Authority [Axis]" } } }, "localname": "IncomeTaxAuthorityAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxAuthorityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Agency, division or body classification that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.", "label": "Income Tax Authority [Domain]" } } }, "localname": "IncomeTaxAuthorityDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeTaxContingencyLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Income Tax Contingency [Line Items]" } } }, "localname": "IncomeTaxContingencyLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxContingencyTable": { "auth_ref": [ "r352", "r353", "r355", "r363" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.", "label": "Income Tax Contingency [Table]" } } }, "localname": "IncomeTaxContingencyTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Income Taxes [Abstract]" } } }, "localname": "IncomeTaxDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxDisclosureTextBlock": { "auth_ref": [ "r369" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.", "label": "Income Tax Disclosure [Text Block]", "terseLabel": "Income Taxes" } } }, "localname": "IncomeTaxDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxes" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxExpenseBenefit": { "auth_ref": [ "r92", "r136", "r367" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": -1.0 }, "http://trustcobank.com/role/IncomeTaxesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Income taxes", "terseLabel": "Income tax (benefit) expense", "totalLabel": "Total income tax expense", "verboseLabel": "Income tax benefit" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/IncomeTaxesDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Summary of income tax expense/(benefit) [Abstract]" } } }, "localname": "IncomeTaxExpenseBenefitContinuingOperationsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxPolicyTextBlock": { "auth_ref": [ "r51", "r91", "r347", "r348", "r354", "r355", "r357", "r368", "r515" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.", "label": "Income Tax, Policy [Policy Text Block]", "terseLabel": "Income Taxes" } } }, "localname": "IncomeTaxPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate": { "auth_ref": [ "r346", "r349", "r350" ], "calculation": { "http://trustcobank.com/role/IncomeTaxesDetails": { "order": 3.0, "parentTag": "us-gaap_IncomeTaxExpenseBenefit", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.", "label": "Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount", "terseLabel": "Enactment of Federal Tax Reform" } } }, "localname": "IncomeTaxReconciliationChangeInEnactedTaxRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost": { "auth_ref": [ "r349", "r350" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.", "label": "Annual deduction for compensation paid to employee" } } }, "localname": "IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxesPaid": { "auth_ref": [ "r78", "r86" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.", "label": "Income taxes paid" } } }, "localname": "IncomeTaxesPaid", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 5.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.", "label": "Increase (Decrease) in Accrued Interest Receivable, Net", "negatedLabel": "Decrease (increase) in interest receivable" } } }, "localname": "IncreaseDecreaseInAccruedInterestReceivableNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 12.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in accrued expenses, and obligations classified as other.", "label": "Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities", "terseLabel": "(Increase) decrease in accrued expenses and other liabilities" } } }, "localname": "IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInDeposits": { "auth_ref": [ "r84", "r466" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 5.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.", "label": "Net increase (decrease) in deposits" } } }, "localname": "IncreaseDecreaseInDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInIncomeTaxesReceivable": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.", "label": "Increase (Decrease) in Income Taxes Receivable", "negatedLabel": "Decrease in taxes receivable" } } }, "localname": "IncreaseDecreaseInIncomeTaxesReceivable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInInterestPayableNet": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 8.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.", "label": "Increase (Decrease) in Interest Payable, Net", "verboseLabel": "Increase in interest payable" } } }, "localname": "IncreaseDecreaseInInterestPayableNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingAssets": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 11.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in operating assets classified as other.", "label": "Increase (Decrease) in Other Operating Assets", "negatedLabel": "Increase in other assets" } } }, "localname": "IncreaseDecreaseInOtherOperatingAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet": { "auth_ref": [ "r80" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.", "label": "Increase (Decrease) in Other Operating Assets and Liabilities, Net", "negatedTerseLabel": "Net change in other assets and accrued expenses" } } }, "localname": "IncreaseDecreaseInOtherOperatingCapitalNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 0.0, "parentTag": "trst_ChangeInOverfundedPortionOfPensionAndPostRetirementBenefitPlansAsc715Net", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans.", "label": "Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits", "negatedLabel": "Change in overfunded portion of pension and post retirement benefit plans (ASC 715) - gross of deferred taxes", "negatedTerseLabel": "Change in overfunded position in pension and postretirement plans arising during the year" } } }, "localname": "IncreaseDecreaseInPensionAndPostretirementObligations", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements": { "auth_ref": [ "r112", "r117" ], "calculation": { "http://trustcobank.com/role/EarningsPerShareDetails": { "order": 1.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.", "label": "Effect of dilutive common stock options (in shares)" } } }, "localname": "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_InformationByCategoryOfDebtSecurityAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by category of debt security, either available-for-sale or held-to-maturity.", "label": "Investment [Axis]" } } }, "localname": "InformationByCategoryOfDebtSecurityAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "stringItemType" }, "us-gaap_InterestAndDividendIncomeOperating": { "auth_ref": [ "r455" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestIncomeExpenseNet", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.", "label": "Interest and Dividend Income, Operating", "totalLabel": "Total interest and dividend income" } } }, "localname": "InterestAndDividendIncomeOperating", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndDividendIncomeOperatingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Interest and dividend income:" } } }, "localname": "InterestAndDividendIncomeOperatingAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.", "label": "Interest and Dividend Income, Securities, Operating, Available-for-sale", "totalLabel": "Total interest and dividends on securities available for sale" } } }, "localname": "InterestAndDividendIncomeSecuritiesAvailableForSale", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndDividendIncomeSecuritiesByClassificationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Interest and Dividend Income, Securities, by Classification [Abstract]", "verboseLabel": "Interest and dividends on securities available for sale:" } } }, "localname": "InterestAndDividendIncomeSecuritiesByClassificationAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity": { "auth_ref": [], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 3.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities.", "label": "Interest Income, Debt Securities, Held-to-maturity", "totalLabel": "Total interest on held to maturity securities" } } }, "localname": "InterestAndDividendIncomeSecuritiesHeldToMaturity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestAndFeeIncomeLoansAndLeases": { "auth_ref": [ "r454" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestAndDividendIncomeOperating", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Interest and fees on loans" } } }, "localname": "InterestAndFeeIncomeLoansAndLeases", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestBearingDepositsInBanks": { "auth_ref": [ "r434", "r448" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_CashAndCashEquivalentsAtCarryingValue", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.", "label": "Interest-bearing Deposits in Banks and Other Financial Institutions", "verboseLabel": "Federal funds sold and other short term investments" } } }, "localname": "InterestBearingDepositsInBanks", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpense": { "auth_ref": [ "r53", "r135", "r405", "r406", "r465" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestIncomeExpenseNet", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.", "label": "Interest Expense", "totalLabel": "Total interest expense" } } }, "localname": "InterestExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseDeposits": { "auth_ref": [ "r463" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestExpense", "weight": 1.0 }, "http://trustcobank.com/role/DepositsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Aggregate amount of interest expense on all deposits.", "label": "Interest on deposits", "totalLabel": "Total" } } }, "localname": "InterestExpenseDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseDepositsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Interest expense:", "terseLabel": "Interest Expense, Deposits [Abstract]" } } }, "localname": "InterestExpenseDepositsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits": { "auth_ref": [ "r463" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 1.0, "parentTag": "us-gaap_InterestExpenseDeposits", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Interest expense incurred on the amount of Negotiable Order of Withdrawal (NOW). Interest-bearing transaction account that combines the payable on demand feature of checks and investment feature of savings accounts. A NOW account is functionally an interest paying checking account.", "label": "Interest bearing checking accounts" } } }, "localname": "InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseSavingsDeposits": { "auth_ref": [ "r463" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 2.0, "parentTag": "us-gaap_InterestExpenseDeposits", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Interest expense incurred on all savings account deposits.", "label": "Interest Expense, Savings Deposits", "terseLabel": "Savings accounts" } } }, "localname": "InterestExpenseSavingsDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseShortTermBorrowings": { "auth_ref": [ "r464" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.", "label": "Interest on short-term borrowings" } } }, "localname": "InterestExpenseShortTermBorrowings", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss": { "auth_ref": [ "r458" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 3.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Interest Income (Expense), after Provision for Loan Loss", "totalLabel": "Net interest income after provision for loan losses" } } }, "localname": "InterestIncomeExpenseAfterProvisionForLoanLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestIncomeExpenseNet": { "auth_ref": [ "r456" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net amount of operating interest income (expense).", "label": "Interest Income (Expense), Net", "totalLabel": "Net interest income" } } }, "localname": "InterestIncomeExpenseNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestPaidNet": { "auth_ref": [ "r75", "r77", "r86" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.", "label": "Interest paid" } } }, "localname": "InterestPaidNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_InternalCreditAssessmentAxis": { "auth_ref": [ "r160", "r219", "r225", "r226", "r247", "r380" ], "lang": { "en-US": { "role": { "documentation": "Information by entity-defined rating.", "label": "Internal Credit Assessment [Axis]" } } }, "localname": "InternalCreditAssessmentAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InternalCreditAssessmentDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Entity defined credit risk rating.", "label": "Internal Credit Assessment [Domain]" } } }, "localname": "InternalCreditAssessmentDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InternalRevenueServiceIRSMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Designated tax department of the United States of America government entitled to levy and collect income taxes from the entity.", "label": "Federal [Member]" } } }, "localname": "InternalRevenueServiceIRSMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.", "label": "Debt Securities Based on Securities Contractual Maturity" } } }, "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Investment Securities [Abstract]" } } }, "localname": "InvestmentsDebtAndEquitySecuritiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_InvestmentsInAndAdvancesToAffiliatesAmountOfEquity": { "auth_ref": [ "r508", "r509", "r510" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails": { "order": 1.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of Equity in net profit and loss for the period. Give totals for each group. If operations of any controlled companies are different in character from those of the company, group such affiliates (1) within divisions and (2) by type of activities.", "label": "Investments in and Advances to Affiliates, Amount of Equity", "terseLabel": "Investments in subsidiaries" } } }, "localname": "InvestmentsInAndAdvancesToAffiliatesAmountOfEquity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock": { "auth_ref": [ "r209", "r433", "r471", "r511" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for investments in certain debt and equity securities.", "label": "Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]", "verboseLabel": "Investment Securities" } } }, "localname": "InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecurities" ], "xbrltype": "textBlockItemType" }, "us-gaap_LaborAndRelatedExpense": { "auth_ref": [ "r59" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.", "label": "Salaries and employee benefits" } } }, "localname": "LaborAndRelatedExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_LandMember": { "auth_ref": [ "r258" ], "lang": { "en-US": { "role": { "documentation": "Part of earth's surface not covered by water.", "label": "Land [Member]" } } }, "localname": "LandMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LeaseAndRentalExpense": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.", "label": "Operating Leases, Rent Expense", "verboseLabel": "Occupancy expense of the Bank's premises included rental expense" } } }, "localname": "LeaseAndRentalExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseCost": { "auth_ref": [ "r420", "r422" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of lease cost recognized by lessee for lease contract.", "label": "Lease, Cost", "totalLabel": "Total Lease costs" } } }, "localname": "LeaseCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseCostAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other information related to leases [Abstract]" } } }, "localname": "LeaseCostAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LeaseCostTableTextBlock": { "auth_ref": [ "r420" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.", "label": "Lease, Cost [Table Text Block]", "terseLabel": "Other Information Related to Leases" } } }, "localname": "LeaseCostTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LeaseholdImprovementsMember": { "auth_ref": [ "r238" ], "lang": { "en-US": { "role": { "documentation": "Additions or improvements to assets held under a lease arrangement.", "label": "Leasehold Improvements [Member]" } } }, "localname": "LeaseholdImprovementsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LeasesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Operating leases [Abstract]" } } }, "localname": "LeasesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_LeasesOperatingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Leases, operating [Abstract]" } } }, "localname": "LeasesOperatingAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Lessee, Lease, Description [Line Items]" } } }, "localname": "LesseeLeaseDescriptionLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionTable": { "auth_ref": [ "r413" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about lessee's leases.", "label": "Lessee, Lease, Description [Table]" } } }, "localname": "LesseeLeaseDescriptionTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": { "auth_ref": [ "r421" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.", "label": "Lessee, Operating Lease, Liability, Maturity [Table Text Block]", "terseLabel": "Future Minimum Lease Payments" } } }, "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/OperatingLeasesDetailsCalc01": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease.", "label": "Lessee, Operating Lease, Liability, Payments, Due", "terseLabel": "Lease liability", "totalLabel": "Total lease payments" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails", "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 6.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due after Year Five", "terseLabel": "Thereafter" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months", "terseLabel": "2020" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 5.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Five", "terseLabel": "2024" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 4.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Four", "terseLabel": "2023" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 3.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Three", "terseLabel": "2022" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Two", "terseLabel": "2021" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": { "auth_ref": [ "r421" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetailsCalc01": { "order": 1.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.", "label": "Lessee, Operating Lease, Liability, Undiscounted Excess Amount", "terseLabel": "Less: Interest" } } }, "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseTermOfContract": { "auth_ref": [ "r412" ], "lang": { "en-US": { "role": { "documentation": "Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee, Operating Lease, Term of Contract", "terseLabel": "Operating lease expiration term" } } }, "localname": "LesseeOperatingLeaseTermOfContract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "durationItemType" }, "us-gaap_LesseeOperatingLeasesTextBlock": { "auth_ref": [ "r423" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.", "label": "Operating leases" } } }, "localname": "LesseeOperatingLeasesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeases" ], "xbrltype": "textBlockItemType" }, "us-gaap_LeverageRatiosAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Leverage Ratios [Abstract]" } } }, "localname": "LeverageRatiosAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_Liabilities": { "auth_ref": [ "r24" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.", "label": "Liabilities", "totalLabel": "Total liabilities" } } }, "localname": "Liabilities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "LIABILITIES AND SHAREHOLDERS' EQUITY", "terseLabel": "Liabilities and shareholders' equity [Abstract]", "verboseLabel": "LIABILITIES AND SHAREHOLDERS' EQUITY" } } }, "localname": "LiabilitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r16", "r440", "r492" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.", "label": "Liabilities and Equity", "totalLabel": "Total liabilities and shareholders' equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoanAndLeaseReceivablesImpairedAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Impaired loans by loans class [Abstract]", "terseLabel": "Impaired loans [Abstract]" } } }, "localname": "LoanAndLeaseReceivablesImpairedAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LoansAndLeasesReceivableAllowance": { "auth_ref": [ "r145", "r149", "r174", "r180", "r449" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": -1.0 }, "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails": { "order": 2.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.", "label": "Total ending allowance balance", "periodEndLabel": "Balance at end of period", "periodStartLabel": "Balance at beginning of period", "verboseLabel": "Less: Allowance for loan losses" } } }, "localname": "LoansAndLeasesReceivableAllowance", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableAllowanceForLoanLossesPolicy": { "auth_ref": [ "r91", "r172" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for estimating the allowance for losses on loans and lease receivables. The disclosure may include (a) how the entity determines each element of the allowance, (b) which loans are evaluated individually and which loans are evaluated as a group, (c) how the entity determines both the allocated and unallocated portions of the allowance, (d) how the entity determines the loss factors applied to graded loans in order to develop a general allowance, and (e) what self-correcting mechanism the entity uses to reduce differences between estimated and actual losses.", "label": "Allowance for Loan Losses" } } }, "localname": "LoansAndLeasesReceivableAllowanceForLoanLossesPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_LoansAndLeasesReceivableDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Loans [Abstract]" } } }, "localname": "LoansAndLeasesReceivableDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount": { "auth_ref": [ "r141" ], "calculation": { "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails": { "order": 1.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.", "label": "Total loans, net", "terseLabel": "Total loans", "verboseLabel": "Total ending loans balance" } } }, "localname": "LoansAndLeasesReceivableGrossCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableGrossCarryingAmountAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Loans and Leases Receivable, Gross, Carrying Amount [Abstract]" } } }, "localname": "LoansAndLeasesReceivableGrossCarryingAmountAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome": { "auth_ref": [ "r141", "r165" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_LoansAndLeasesReceivableNetReportedAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.", "label": "Loans, net of deferred net costs" } } }, "localname": "LoansAndLeasesReceivableNetOfDeferredIncome", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableNetReportedAmount": { "auth_ref": [ "r141", "r451" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 4.0, "parentTag": "us-gaap_Assets", "weight": 1.0 }, "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.", "label": "Loans and Leases Receivable, Net Amount", "totalLabel": "Net loans" } } }, "localname": "LoansAndLeasesReceivableNetReportedAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Loans and Leases Receivable [Abstract]" } } }, "localname": "LoansAndLeasesReceivableNetReportedAmountAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LoansAndLeasesReceivableRealEstateAcquiredThroughForeclosurePolicy": { "auth_ref": [ "r175" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for real estate acquired through foreclosure.", "label": "Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block]", "terseLabel": "Other Real Estate Owned" } } }, "localname": "LoansAndLeasesReceivableRealEstateAcquiredThroughForeclosurePolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions": { "auth_ref": [ "r424", "r450" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reflects the amount of new advances made to related parties in the form of loan and lease receivables.", "label": "New loans" } } }, "localname": "LoansAndLeasesReceivableRelatedPartiesAdditions", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds": { "auth_ref": [ "r66", "r444" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.", "label": "Repayments of loans" } } }, "localname": "LoansAndLeasesReceivableRelatedPartiesProceeds", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansReceivableFairValueDisclosure": { "auth_ref": [ "r175" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.", "label": "Loans Receivable, Fair Value Disclosure", "terseLabel": "Net loans" } } }, "localname": "LoansReceivableFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermPurchaseCommitmentAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The minimum amount the entity agreed to spend under the long-term purchase commitment.", "label": "Outsource service expense" } } }, "localname": "LongTermPurchaseCommitmentAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by category of items purchased under a long-term purchase commitment.", "label": "Category of Item Purchased [Axis]" } } }, "localname": "LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "General description of the goods or services to be purchased from the counterparty to the long-term purchase commitment.", "label": "Long-term Purchase Commitment, Category of Item Purchased [Domain]" } } }, "localname": "LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LongTermPurchaseCommitmentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Long-term Purchase Commitment [Line Items]" } } }, "localname": "LongTermPurchaseCommitmentLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongTermPurchaseCommitmentTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule setting forth key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount.", "label": "Long-term Purchase Commitment [Table]" } } }, "localname": "LongTermPurchaseCommitmentTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/CommitmentsAndContingentLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MarketApproachValuationTechniqueMember": { "auth_ref": [ "r385" ], "lang": { "en-US": { "role": { "documentation": "Valuation approach using price and other relevant information generated by market transaction involving identical or comparable asset, liability, or group of assets and liabilities.", "label": "Valuation, Market Approach [Member]", "terseLabel": "Sales Comparison Approach [Member]" } } }, "localname": "MarketApproachValuationTechniqueMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MarketableSecuritiesPolicy": { "auth_ref": [ "r470" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for investment classified as marketable security.", "label": "Securities Available for Sale and Held to Maturity (Debt Securities)" } } }, "localname": "MarketableSecuritiesPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_MaturitiesOfTimeDepositsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Maturity of Time Deposits [Abstract]" } } }, "localname": "MaturitiesOfTimeDepositsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MeasurementInputComparabilityAdjustmentMember": { "auth_ref": [ "r385" ], "lang": { "en-US": { "role": { "documentation": "Measurement input using adjustment to observed price for similar asset or liability when identical transaction does not exist.", "label": "Adjustments for Differences Between Comparable Sales [Member]" } } }, "localname": "MeasurementInputComparabilityAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputTypeAxis": { "auth_ref": [ "r385" ], "lang": { "en-US": { "role": { "documentation": "Information by type of measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Axis]" } } }, "localname": "MeasurementInputTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MeasurementInputTypeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Domain]" } } }, "localname": "MeasurementInputTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MortgageBackedSecuritiesMember": { "auth_ref": [ "r184", "r278", "r279", "r308", "r501" ], "lang": { "en-US": { "role": { "documentation": "Securities collateralized by mortgage loans.", "label": "Mortgage-Backed Securities and Collateralized Mortgage Obligations-Residential [Member]", "terseLabel": "Mortgage-Backed Securities and Collateralized Mortgage Obligations-Residential [Member]", "verboseLabel": "Mortgage-Backed Securities and Collateralized Mortgage Obligations-Residential [Member]" } } }, "localname": "MortgageBackedSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "domainItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r76" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 0.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.", "label": "Net Cash Provided by (Used in) Financing Activities", "totalLabel": "Net cash provided by (used in) financing activities" } } }, "localname": "NetCashProvidedByUsedInFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash flows from financing activities:", "terseLabel": "Cash flows from financing activities [Abstract]" } } }, "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r76" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.", "label": "Net Cash Provided by (Used in) Investing Activities", "totalLabel": "Net cash used in investing activities" } } }, "localname": "NetCashProvidedByUsedInInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash flows from investing activities:" } } }, "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r76", "r79", "r82" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 2.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.", "label": "Net Cash Provided by (Used in) Operating Activities", "totalLabel": "Net cash provided by operating activities" } } }, "localname": "NetCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]", "terseLabel": "Cash flows from operating activities:", "verboseLabel": "Cash flows from operating activities [Abstract]" } } }, "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r45", "r48", "r55", "r82", "r117", "r452", "r496" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 1.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 }, "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.", "label": "Net income", "terseLabel": "Net Income", "totalLabel": "Net income", "verboseLabel": "Net income" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome", "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/EarningsPerShareDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Recent Accounting Pronouncements [Abstract]" } } }, "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": { "auth_ref": [ "r108" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.", "label": "Recent Accounting Pronouncements" } } }, "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncements" ], "xbrltype": "textBlockItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": { "auth_ref": [ "r102", "r104" ], "lang": { "en-US": { "role": { "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.", "label": "New Accounting Pronouncements or Change in Accounting Principle [Table]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NoninterestExpense": { "auth_ref": [ "r462" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 1.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": -1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Total aggregate amount of all noninterest expense.", "label": "Noninterest Expense", "totalLabel": "Total noninterest expense" } } }, "localname": "NoninterestExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NoninterestExpenseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Noninterest expense:" } } }, "localname": "NoninterestExpenseAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "us-gaap_NoninterestIncome": { "auth_ref": [ "r459" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Total non-interest income", "totalLabel": "Total noninterest income" } } }, "localname": "NoninterestIncome", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NoninterestIncomeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Noninterest income:" } } }, "localname": "NoninterestIncomeAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "stringItemType" }, "us-gaap_NoninterestIncomeOther": { "auth_ref": [ "r459" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 3.0, "parentTag": "us-gaap_NoninterestIncome", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Noninterest Income, Other", "verboseLabel": "Other" } } }, "localname": "NoninterestIncomeOther", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_NumberOfReportableSegments": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.", "label": "Number of reportable segment" } } }, "localname": "NumberOfReportableSegments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_OccupancyNet": { "auth_ref": [ "r63", "r407", "r460" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Net occupancy expense" } } }, "localname": "OccupancyNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent": { "auth_ref": [ "r41", "r52" ], "calculation": { "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.", "label": "OCI, before Reclassifications, Net of Tax, Attributable to Parent", "terseLabel": "Other comprehensive income (loss) - before reclassifications" } } }, "localname": "OciBeforeReclassificationsNetOfTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OfficeEquipmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tangible personal property used in an office setting. Examples include, but are not limited to, computers, copiers and fax machine.", "label": "Furniture and Equipment [Member]" } } }, "localname": "OfficeEquipmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OpenTaxYear": { "auth_ref": [ "r351" ], "lang": { "en-US": { "role": { "documentation": "Tax year that remains open to examination under enacted tax laws, in CCYY format.", "label": "Open tax year" } } }, "localname": "OpenTaxYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "gYearListItemType" }, "us-gaap_OperatingExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Expenses [Abstract]" } } }, "localname": "OperatingExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingLeaseCost": { "auth_ref": [ "r414", "r422" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.", "label": "Operating lease cost" } } }, "localname": "OperatingLeaseCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Future minimum lease payments under non-cancellable leases [Abstract]" } } }, "localname": "OperatingLeaseLiabilitiesPaymentsDueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingLeaseLiability": { "auth_ref": [ "r410" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 3.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 }, "http://trustcobank.com/role/OperatingLeasesDetailsCalc01": { "order": 2.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.", "label": "Operating lease liabilities", "terseLabel": "Present value of the remaining lease payments", "verboseLabel": "Present value of lease liabilities" } } }, "localname": "OperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/OperatingLeasesDetails", "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasePayments": { "auth_ref": [ "r411", "r416" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.", "label": "Operating Lease, Payments", "terseLabel": "Operating cash flows from operating leases" } } }, "localname": "OperatingLeasePayments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseRightOfUseAsset": { "auth_ref": [ "r409" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 5.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's right to use underlying asset under operating lease.", "label": "Operating lease right-of-use assets", "terseLabel": "ROU asset" } } }, "localname": "OperatingLeaseRightOfUseAsset", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/OperatingLeasesDetails", "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": { "auth_ref": [ "r419", "r422" ], "lang": { "en-US": { "role": { "documentation": "Weighted average discount rate for operating lease calculated at point in time.", "label": "Operating Lease, Weighted Average Discount Rate, Percent", "terseLabel": "Weighted average discount rate" } } }, "localname": "OperatingLeaseWeightedAverageDiscountRatePercent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": { "auth_ref": [ "r418", "r422" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Operating Lease, Weighted Average Remaining Lease Term", "terseLabel": "Weighted average remaining lease term" } } }, "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "durationItemType" }, "us-gaap_OptionIndexedToIssuersEquityStrikePrice1": { "auth_ref": [ "r251", "r381" ], "lang": { "en-US": { "role": { "documentation": "Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.", "label": "Weighted average strike price (in dollars per share)" } } }, "localname": "OptionIndexedToIssuersEquityStrikePrice1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r0", "r101", "r132", "r379" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.", "label": "Basis of Presentation" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentation" ], "xbrltype": "textBlockItemType" }, "us-gaap_OtherAssets": { "auth_ref": [ "r5", "r436", "r487" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 7.0, "parentTag": "us-gaap_Assets", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails": { "order": 3.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of assets classified as other.", "label": "Other assets" } } }, "localname": "OtherAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r372", "r373", "r375" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.", "label": "Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent", "totalLabel": "Net unrealized gain (loss) on securities available for sale, net of tax" } } }, "localname": "OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent": { "auth_ref": [ "r372", "r373", "r375" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 3.0, "parentTag": "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.", "label": "Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent", "negatedLabel": "Tax effect" } } }, "localname": "OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax": { "auth_ref": [ "r35", "r37", "r288" ], "calculation": { "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails": { "order": 3.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax", "weight": 1.0 }, "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 2.0, "parentTag": "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).", "label": "Prior service cost" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent": { "auth_ref": [ "r372", "r373", "r375" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive (income) loss for defined benefit plan, attributable to parent entity.", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent", "terseLabel": "Amortization of net actuarial loss and prior service credit on pension and post retirement plans, gross of deferred taxes" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r34", "r37", "r372", "r375" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 3.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent", "negatedTotalLabel": "Amortization of net actuarial gain and prior service credit on pension and postretirement plans, net of tax" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent": { "auth_ref": [ "r372", "r373", "r375" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.", "label": "Change in deferred tax effect of amortization of net actuarial loss and prior service credit on pension and post retirement plans", "terseLabel": "Tax effect" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax": { "auth_ref": [ "r37", "r42", "r43", "r288" ], "calculation": { "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax", "weight": -1.0 }, "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 1.0, "parentTag": "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "weight": 1.0 }, "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax", "negatedLabel": "Amortization of prior service credit", "negatedTerseLabel": "Amortization of prior service credit (cost)", "verboseLabel": "Amortization of prior service (benefit) cost" } } }, "localname": "OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax": { "auth_ref": [ "r29", "r30", "r38" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.", "label": "Change in deferred tax effect on unrealized (gain) loss on securities available for sale, net of reclassification adjustment" } } }, "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r46", "r49", "r372", "r373", "r375" ], "calculation": { "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 2.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of other comprehensive income (loss) attributable to parent entity.", "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent", "terseLabel": "Change in other comprehensive income (loss), net of tax", "totalLabel": "Other comprehensive income (loss), net of tax", "verboseLabel": "Change in other comprehensive income (loss)" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTaxAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]", "terseLabel": "Change in component of other comprehensive (loss) income related to the retirement plan or the post-retirement benefit plan [Abstract]" } } }, "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTaxAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax": { "auth_ref": [ "r34", "r37" ], "calculation": { "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax", "totalLabel": "Total" } } }, "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax": { "auth_ref": [ "r32", "r37", "r288" ], "calculation": { "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails": { "order": 0.0, "parentTag": "us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.", "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax", "negatedLabel": "Net actuarial (gain) loss included in other comprehensive (loss) income" } } }, "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax": { "auth_ref": [ "r37", "r42", "r43", "r288" ], "calculation": { "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax", "weight": 1.0 }, "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 0.0, "parentTag": "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.", "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax", "negatedLabel": "Amortization of net actuarial gain", "terseLabel": "Amortization of net actuarial (loss) gain" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax": { "auth_ref": [ "r29", "r37", "r208" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.", "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax", "terseLabel": "Net unrealized holding gain (loss) on securities available for sale" } } }, "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherCostAndExpenseOperating": { "auth_ref": [ "r61" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 3.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.", "label": "Miscellaneous expense" } } }, "localname": "OtherCostAndExpenseOperating", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherDebtSecuritiesMember": { "auth_ref": [ "r200", "r229", "r278", "r389" ], "lang": { "en-US": { "role": { "documentation": "Investments in debt securities classified as other.", "label": "Other Debt Obligations [Member]", "terseLabel": "Other [Member]", "verboseLabel": "Other [Member]" } } }, "localname": "OtherDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherLaborRelatedExpenses": { "auth_ref": [ "r62" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of labor-related expenses classified as other.", "label": "Expense for officers and executive incentive plan" } } }, "localname": "OtherLaborRelatedExpenses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNoninterestExpense": { "auth_ref": [ "r462" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 9.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of noninterest expense classified as other.", "label": "Other Noninterest Expense", "verboseLabel": "Other" } } }, "localname": "OtherNoninterestExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherOperatingIncome": { "auth_ref": [ "r60" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 4.0, "parentTag": "us-gaap_Revenues", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.", "label": "Other Operating Income", "verboseLabel": "Miscellaneous income" } } }, "localname": "OtherOperatingIncome", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember": { "auth_ref": [ "r263", "r297", "r298", "r312" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.", "label": "Postretirement Benefits [Member]" } } }, "localname": "OtherPostretirementBenefitPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "domainItemType" }, "us-gaap_OtherRealEstate": { "auth_ref": [ "r445" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.", "label": "Other Real Estate", "verboseLabel": "Other real estate owned" } } }, "localname": "OtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherRealEstateAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Real Estate [Abstract]", "terseLabel": "Other Real Estate Owned [Abstract]" } } }, "localname": "OtherRealEstateAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OtherRealEstateOwnedMeasurementInput": { "auth_ref": [ "r387" ], "lang": { "en-US": { "role": { "documentation": "Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.", "label": "Other real estate owned, unobservable inputs" } } }, "localname": "OtherRealEstateOwnedMeasurementInput", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "decimalItemType" }, "us-gaap_OtherRealEstateOwnedMeasurementInputExtensibleList": { "auth_ref": [ "r386" ], "lang": { "en-US": { "role": { "documentation": "Indicates measurement input for real estate owned by financial institution which is not directly related to its business.", "label": "Other Real Estate Owned, Measurement Input [Extensible List]" } } }, "localname": "OtherRealEstateOwnedMeasurementInputExtensibleList", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "extensibleListItemType" }, "us-gaap_OtherRealEstateOwnedValuationTechniqueExtensibleList": { "auth_ref": [ "r386" ], "lang": { "en-US": { "role": { "documentation": "Indicates valuation technique for measuring real estate owned by financial institution which is not directly related to its business.", "label": "Other Real Estate Owned, Valuation Technique [Extensible List]" } } }, "localname": "OtherRealEstateOwnedValuationTechniqueExtensibleList", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "extensibleListItemType" }, "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "Provides the categories of debt securities, available-for-sale or held-to-maturity, on which an entity may recognize other than temporary impairments (OTTI) for which a portion related to credit losses has been recognized in earnings and a portion related to all other factors has been recognized in other comprehensive income.", "label": "Investment [Domain]" } } }, "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "domainItemType" }, "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Investment [Line Items]" } } }, "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "stringItemType" }, "us-gaap_OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings": { "auth_ref": [ "r183" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings.", "label": "Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings", "terseLabel": "Other-than-temporary impairment losses recognized" } } }, "localname": "OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PassMember": { "auth_ref": [ "r160", "r219" ], "lang": { "en-US": { "role": { "documentation": "A category of financing receivables not considered to be special mention, substandard, doubtful, and loss receivables.", "label": "Pass [Member]" } } }, "localname": "PassMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PastDueFinancingReceivablesTableTextBlock": { "auth_ref": [ "r170", "r171", "r215", "r227" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of aging analysis for financing receivable.", "label": "Financing Receivable, Past Due [Table Text Block]", "terseLabel": "Aging of Recorded Investment in Past Due Loans by Loan Class and by Region" } } }, "localname": "PastDueFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_PaymentsForProceedsFromLoansAndLeases": { "auth_ref": [ "r99" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 7.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.", "label": "Payments for (Proceeds from) Loans and Leases", "negatedLabel": "Net increase in loans" } } }, "localname": "PaymentsForProceedsFromLoansAndLeases", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForRepurchaseOfCommonStock": { "auth_ref": [ "r74" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 7.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow to reacquire common stock during the period.", "label": "Payments for Repurchase of Common Stock", "negatedLabel": "Purchases of treasury stock", "negatedTerseLabel": "Purchases of treasury stock" } } }, "localname": "PaymentsForRepurchaseOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDividendsCommonStock": { "auth_ref": [ "r74" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.", "label": "Payments of Ordinary Dividends, Common Stock", "negatedLabel": "Dividends paid", "negatedTerseLabel": "Dividends paid" } } }, "localname": "PaymentsOfDividendsCommonStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation": { "auth_ref": [ "r74" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 4.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.", "label": "Payment, Tax Withholding, Share-based Payment Arrangement", "negatedLabel": "Stock based award tax withholding payments" } } }, "localname": "PaymentsRelatedToTaxWithholdingForShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireAvailableForSaleSecurities": { "auth_ref": [ "r70", "r182" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.", "label": "Payments to Acquire Available-for-sale Securities", "negatedLabel": "Purchases of securities available for sale" } } }, "localname": "PaymentsToAcquireAvailableForSaleSecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireFederalReserveStock": { "auth_ref": [ "r71" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 11.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow to acquire Federal Reserve Bank (FRB) stock.", "label": "Payments to Acquire Federal Reserve Bank Stock", "negatedTerseLabel": "Purchases of Federal Reserve Bank and Federal Home Loan Bank stock" } } }, "localname": "PaymentsToAcquireFederalReserveStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": { "auth_ref": [ "r72" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 12.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.", "label": "Payments to Acquire Property, Plant, and Equipment", "negatedLabel": "Purchases of bank premises and equipment" } } }, "localname": "PaymentsToAcquirePropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PensionAndOtherPostretirementBenefitExpense": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost (reversal of cost) for pension and other postretirement benefits.", "label": "Pension and Other Postretirement Benefits Cost (Reversal of Cost)", "verboseLabel": "Plan expense" } } }, "localname": "PensionAndOtherPostretirementBenefitExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PensionAndOtherPostretirementBenefitExpenseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Pension and Other Postretirement Benefits Cost [Abstract]" } } }, "localname": "PensionAndOtherPostretirementBenefitExpenseAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PensionAndOtherPostretirementPlansPolicy": { "auth_ref": [ "r91", "r297", "r309", "r310", "r312", "r313" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.", "label": "Benefit Plans" } } }, "localname": "PensionAndOtherPostretirementPlansPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_PensionPlansDefinedBenefitMember": { "auth_ref": [ "r262", "r297", "r298", "r312" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits.", "label": "Retirement Plan [Member]" } } }, "localname": "PensionPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "domainItemType" }, "us-gaap_PerformanceSharesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share-based payment arrangement awarded for meeting performance target.", "label": "Performance Share Units [Member]" } } }, "localname": "PerformanceSharesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PlanAssetCategoriesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Defined benefit plan asset investment.", "label": "Plan Asset Categories [Domain]" } } }, "localname": "PlanAssetCategoriesDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PlanNameAxis": { "auth_ref": [ "r318", "r338" ], "lang": { "en-US": { "role": { "documentation": "Information by plan name for share-based payment arrangement.", "label": "Plan Name [Axis]" } } }, "localname": "PlanNameAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PlanNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Plan name for share-based payment arrangement.", "label": "Plan Name [Domain]" } } }, "localname": "PlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PortionAtFairValueFairValueDisclosureMember": { "auth_ref": [ "r394" ], "lang": { "en-US": { "role": { "documentation": "Measured at fair value for financial reporting purposes.", "label": "Portion at Fair Value Measurement [Member] [Default]", "terseLabel": "Portion at Fair Value Measurement [Member]" } } }, "localname": "PortionAtFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueRecurringBasisDetails", "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities": { "auth_ref": [ "r65", "r66", "r182" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 4.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Proceeds from maturities of securities available for sale" } } }, "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities": { "auth_ref": [ "r66", "r182" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.", "label": "Proceeds from calls and maturities of held to maturity securities" } } }, "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromRepaymentsOfShortTermDebt": { "auth_ref": [ "r99" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.", "label": "Net change in short-term borrowings" } } }, "localname": "ProceedsFromRepaymentsOfShortTermDebt", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities": { "auth_ref": [ "r67", "r182" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.", "label": "Proceeds from sales" } } }, "localname": "ProceedsFromSaleOfAvailableForSaleSecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesTransactionInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfOtherRealEstate": { "auth_ref": [ "r69" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 10.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.", "label": "Proceeds from dispositions of other real estate owned" } } }, "localname": "ProceedsFromSaleOfOtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfPropertyHeldForSale": { "auth_ref": [ "r68" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 8.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.", "label": "Net proceeds from sale of building held for sale" } } }, "localname": "ProceedsFromSaleOfPropertyHeldForSale", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment": { "auth_ref": [ "r68" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 13.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.", "label": "Proceeds from dispositions of bank premises and equipment" } } }, "localname": "ProceedsFromSaleOfPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfTreasuryStock": { "auth_ref": [ "r73" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.", "label": "Proceeds from sales of treasury stock" } } }, "localname": "ProceedsFromSaleOfTreasuryStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromStockOptionsExercised": { "auth_ref": [ "r73", "r339" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 8.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails": { "order": 0.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow from exercise of option under share-based payment arrangement.", "label": "Proceeds from exercise of stock options and related tax benefits", "terseLabel": "Proceeds from exercise of stock options" } } }, "localname": "ProceedsFromStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfessionalFees": { "auth_ref": [ "r505", "r506" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 4.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 }, "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 2.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "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.", "label": "Professional services" } } }, "localname": "ProfessionalFees", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Bank Premises and Equipment [Abstract]" } } }, "localname": "PropertyPlantAndEquipmentAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentByTypeAxis": { "auth_ref": [ "r20", "r240" ], "lang": { "en-US": { "role": { "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.", "label": "Property, Plant and Equipment, Type [Axis]" } } }, "localname": "PropertyPlantAndEquipmentByTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock": { "auth_ref": [ "r242" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.", "label": "Property, Plant and Equipment Disclosure [Text Block]", "terseLabel": "Bank Premises and Equipment" } } }, "localname": "PropertyPlantAndEquipmentDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipment" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentGross": { "auth_ref": [ "r19", "r238" ], "calculation": { "http://trustcobank.com/role/BankPremisesAndEquipmentDetails": { "order": 1.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property, Plant and Equipment, Gross", "terseLabel": "Total bank premises and equipment" } } }, "localname": "PropertyPlantAndEquipmentGross", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Property, Plant and Equipment [Line Items]" } } }, "localname": "PropertyPlantAndEquipmentLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r3", "r4", "r240", "r493" ], "calculation": { "http://trustcobank.com/role/BankPremisesAndEquipmentDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 6.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Bank premises and equipment, net", "totalLabel": "Total" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock": { "auth_ref": [ "r18", "r91", "r240" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments.", "label": "Bank Premises and Equipment" } } }, "localname": "PropertyPlantAndEquipmentPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentTextBlock": { "auth_ref": [ "r3", "r240" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Summary of Premises and Equipment" } } }, "localname": "PropertyPlantAndEquipmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentTypeDomain": { "auth_ref": [ "r3", "r238" ], "lang": { "en-US": { "role": { "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.", "label": "Property, Plant and Equipment, Type [Domain]" } } }, "localname": "PropertyPlantAndEquipmentTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PropertyPlantAndEquipmentUsefulLife": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.", "label": "Premises and equipment, useful life" } } }, "localname": "PropertyPlantAndEquipmentUsefulLife", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ProvisionForLoanAndLeaseLosses": { "auth_ref": [ "r80", "r146", "r457" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 14.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://trustcobank.com/role/ConsolidatedStatementsOfIncome": { "order": 2.0, "parentTag": "us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense related to estimated loss from loan and lease transactions.", "label": "Provision (recoveries) for loan losses", "verboseLabel": "Provision for loan losses" } } }, "localname": "ProvisionForLoanAndLeaseLosses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ConsolidatedStatementsOfIncome", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RealEstateAcquiredThroughForeclosure": { "auth_ref": [ "r142", "r143" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.", "label": "Real Estate Acquired Through Foreclosure", "verboseLabel": "Other real estate owned" } } }, "localname": "RealEstateAcquiredThroughForeclosure", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied": { "auth_ref": [ "r445" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off.", "label": "Real Estate Owned, Valuation Allowance, Amounts Applied", "verboseLabel": "Valuation charge on other real estate owned" } } }, "localname": "RealEstateOwnedValuationAllowanceAmountsApplied", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReceivablesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Loans and Allowance for Loan Losses [Abstract]" } } }, "localname": "ReceivablesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]", "terseLabel": "Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]" } } }, "localname": "ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent": { "auth_ref": [ "r41", "r52" ], "calculation": { "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.", "label": "Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent", "negatedTerseLabel": "Amount reclassified from accumulated other comprehensive income" } } }, "localname": "ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by item reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification out of Accumulated Other Comprehensive Income [Axis]", "terseLabel": "Reclassification Out of Accumulated Other Comprehensive Income [Axis]" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Item reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification out of Accumulated Other Comprehensive Income [Domain]", "terseLabel": "Reclassification Out of Accumulated Other Comprehensive Income [Domain]" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Identifies item reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification out of Accumulated Other Comprehensive Income [Member]", "terseLabel": "Reclassification Out of Accumulated Other Comprehensive Income [Member]" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about items reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification out of Accumulated Other Comprehensive Income [Table]", "terseLabel": "Reclassification Out of Accumulated Other Comprehensive Income [Table]" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]", "terseLabel": "Reclassifications out of Accumulated Other Comprehensive Loss" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock": { "auth_ref": [ "r475", "r476", "r477", "r478", "r479", "r480", "r481", "r482", "r485" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union.", "label": "Regulatory Capital Requirements" } } }, "localname": "RegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirements" ], "xbrltype": "textBlockItemType" }, "us-gaap_ResidentialMortgageMember": { "auth_ref": [ "r226" ], "lang": { "en-US": { "role": { "documentation": "Loan to purchase or refinance residential real estate for example, but not limited to, a home, in which the real estate itself serves as collateral for the loan.", "label": "Residential Mortgage [Member]", "terseLabel": "1 to 4 Family Residential Real Estate [Member]", "verboseLabel": "Real Estate Mortgage - 1 to 4 Family [Member]" } } }, "localname": "ResidentialMortgageMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ResidentialPortfolioSegmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Portfolio segment of the company's total financing receivables related to residential financing receivables.", "label": "Residential Borrowers [Member]" } } }, "localname": "ResidentialPortfolioSegmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ResidentialRealEstateMember": { "auth_ref": [ "r223", "r278" ], "lang": { "en-US": { "role": { "documentation": "Property that is used as a home.", "label": "Residential Real Estate [Member]" } } }, "localname": "ResidentialRealEstateMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestrictedStockMember": { "auth_ref": [ "r116" ], "lang": { "en-US": { "role": { "documentation": "Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met.", "label": "Restricted Common Shares [Member]" } } }, "localname": "RestrictedStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestrictedStockUnitsRSUMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.", "label": "Restricted Shares Units [Member]" } } }, "localname": "RestrictedStockUnitsRSUMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r13", "r253", "r491" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Undivided profits" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings [Member]", "terseLabel": "Undivided Profits [Member]" } } }, "localname": "RetainedEarningsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_RetirementPlanNameAxis": { "auth_ref": [ "r298" ], "lang": { "en-US": { "role": { "documentation": "Information by name of plan designed to provide retirement benefits. Includes, but is not limited to, legal name of defined benefit and defined contribution plans.", "label": "Retirement Plan Name [Axis]" } } }, "localname": "RetirementPlanNameAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetirementPlanNameDomain": { "auth_ref": [ "r298" ], "lang": { "en-US": { "role": { "documentation": "Name of plan designed to provide retirement benefits. Includes, but is not limited to, legal name of defined benefit and defined contribution plans.", "label": "Retirement Plan Name [Domain]" } } }, "localname": "RetirementPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansIncentiveAndBonusPlansDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RetirementPlanTypeAxis": { "auth_ref": [ "r262", "r263", "r297", "r298", "r312" ], "lang": { "en-US": { "role": { "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Axis]" } } }, "localname": "RetirementPlanTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "stringItemType" }, "us-gaap_RetirementPlanTypeDomain": { "auth_ref": [ "r262", "r263", "r297", "r298", "r312" ], "lang": { "en-US": { "role": { "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Domain]" } } }, "localname": "RetirementPlanTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "domainItemType" }, "us-gaap_RevenueFromContractWithCustomerAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Revenue from Contracts with Customers [Abstract]" } } }, "localname": "RevenueFromContractWithCustomerAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax": { "auth_ref": [ "r256", "r257" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.", "label": "Non-interest income" } } }, "localname": "RevenueFromContractWithCustomerExcludingAssessedTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomersDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RevenueFromContractWithCustomerTextBlock": { "auth_ref": [ "r260" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.", "label": "Revenue from Contracts with Customers" } } }, "localname": "RevenueFromContractWithCustomerTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RevenueFromContractsWithCustomers" ], "xbrltype": "textBlockItemType" }, "us-gaap_Revenues": { "auth_ref": [ "r54", "r133", "r134", "r138" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).", "label": "Revenues", "totalLabel": "Total income" } } }, "localname": "Revenues", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": { "auth_ref": [ "r417", "r422" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.", "label": "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability", "terseLabel": "Right-of-use assets obtained in exchange for lease obligations:" } } }, "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RiskBasedRatiosAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Risk Based Ratios [Abstract]" } } }, "localname": "RiskBasedRatiosAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable": { "auth_ref": [ "r28" ], "lang": { "en-US": { "role": { "documentation": "Schedule itemizing specific types of trade accounts and notes receivable, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.", "label": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]" } } }, "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentInLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock": { "auth_ref": [ "r28" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.", "label": "Recorded Investment in Loans by Loan Class" } } }, "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock": { "auth_ref": [ "r280" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation.", "label": "Change in Projected/Accumulated Benefit Obligation" } } }, "localname": "ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": { "auth_ref": [ "r41" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of accumulated other comprehensive income (loss).", "label": "Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]", "verboseLabel": "Accumulated Other Comprehensive Loss Balances, Net of Tax" } } }, "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock": { "auth_ref": [ "r276" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.", "label": "Asset Allocation of Pension and Postretirement Benefit Plans" } } }, "localname": "ScheduleOfAllocationOfPlanAssetsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock": { "auth_ref": [ "r288" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.", "label": "Amounts Recognized in Accumulated Other Comprehensive Income" } } }, "localname": "ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable": { "auth_ref": [ "r116" ], "lang": { "en-US": { "role": { "documentation": "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.", "label": "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAssumptionsUsedTableTextBlock": { "auth_ref": [ "r291" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.", "label": "Assumptions used to Determine Benefit Obligation and Net Periodic Expense" } } }, "localname": "ScheduleOfAssumptionsUsedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Debt Securities, Available-for-sale [Line Items]" } } }, "localname": "ScheduleOfAvailableForSaleSecuritiesLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.", "label": "Amortized Cost and Fair Value of Securities Available For Sale" } } }, "localname": "ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock": { "auth_ref": [ "r271" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements.", "label": "Change in Plan Assets and Reconciliation of Funded Status" } } }, "localname": "ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable": { "auth_ref": [ "r474", "r477", "r482", "r484" ], "lang": { "en-US": { "role": { "documentation": "A table disclosing the capital amounts and ratios as of the balance sheet date indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.", "label": "Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table]" } } }, "localname": "ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock": { "auth_ref": [ "r474", "r477", "r482", "r484" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.", "label": "Summary of Actual Capital Amounts and Ratios" } } }, "localname": "ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock": { "auth_ref": [ "r362" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.", "label": "Summary of Income Tax Expense" } } }, "localname": "ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock": { "auth_ref": [ "r356" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.", "label": "Tax Effects of Temporary Differences" } } }, "localname": "ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable": { "auth_ref": [ "r297", "r298", "r299", "r300", "r308" ], "lang": { "en-US": { "role": { "documentation": "Disclosures about an individual defined benefit pension plan or an other postretirement defined benefit plan. It may be appropriate to group certain similar plans. Also includes schedule for fair value of plan assets by major categories of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).", "label": "Schedule of Defined Benefit Plans Disclosures [Table]" } } }, "localname": "ScheduleOfDefinedBenefitPlansDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansAllocationOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansChangeInProjectedBenefitObligationPlanAssetsAndFundedStatusReconciliationDetails", "http://trustcobank.com/role/BenefitPlansEstimatedFutureBenefitPaymentsAssumptionsAndChangeInObligationDetails", "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/BenefitPlansHealthCareCostTrendRateAndOtherComprehensiveIncomeDisclosuresDetails", "http://trustcobank.com/role/BenefitPlansPlanDisclosuresDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r117" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.", "label": "Reconciliation of the Component Parts of Earnings per Share" } } }, "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock": { "auth_ref": [ "r349" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.", "label": "Effective Income Tax Rate" } } }, "localname": "ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock": { "auth_ref": [ "r281" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.", "label": "Estimated Future Benefit Payments" } } }, "localname": "ScheduleOfExpectedBenefitPaymentsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable": { "auth_ref": [ "r396", "r397" ], "lang": { "en-US": { "role": { "documentation": "Schedule detailing the information required and determined to be disclosed regarding the fair value of financial assets and financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.", "label": "Schedule of Fair Value, Off-balance Sheet Risks [Table]" } } }, "localname": "ScheduleOfFairValueOffBalanceSheetRisksTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable": { "auth_ref": [ "r214" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about allowance for credit loss on financing receivable.", "label": "Schedule of Financing Receivable, Allowance for Credit Losses [Table]" } } }, "localname": "ScheduleOfFinancingReceivableAllowanceForCreditLossesTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesAllowanceForLoanLossesDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesBasedOnImpairmentReviewMethodDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable": { "auth_ref": [ "r219", "r226" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about credit quality indicator for financing receivable.", "label": "Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table]" } } }, "localname": "ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesRiskCategoryOfLoansDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable": { "auth_ref": [ "r162", "r164" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about financing receivable modified as troubled debt restructuring.", "label": "Schedule of Financing Receivable, Troubled Debt Restructurings [Table]" } } }, "localname": "ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesModifiedLoansPaymentStatusDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock": { "auth_ref": [ "r170", "r218" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of financing receivable on nonaccrual status.", "label": "Financing Receivable, Nonaccrual [Table Text Block]", "terseLabel": "Recorded Investment in Non-Accrual Loans by Loan Class" } } }, "localname": "ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFinancingReceivablesPastDueTable": { "auth_ref": [ "r215", "r227" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about aging analysis for financing receivable.", "label": "Schedule of Financing Receivables Past Due [Table]" } } }, "localname": "ScheduleOfFinancingReceivablesPastDueTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesNonaccrualLoansByLoanClassDetails", "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesPastDueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Schedule of Held-to-maturity Securities [Line Items]" } } }, "localname": "ScheduleOfHeldToMaturitySecuritiesLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfHeldToMaturitySecuritiesTable": { "auth_ref": [ "r199" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).", "label": "Schedule of Held-to-maturity Securities [Table]" } } }, "localname": "ScheduleOfHeldToMaturitySecuritiesTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfImpairedFinancingReceivableTable": { "auth_ref": [ "r157" ], "lang": { "en-US": { "role": { "documentation": "Schedule of the recorded investment, unpaid principal balance, associated allowance, average recorded investment, accounting policies, and interest income recognized on the accrual and cash basis for impaired financing receivables by class of financing receivable.", "label": "Schedule of Impaired Financing Receivable [Table]" } } }, "localname": "ScheduleOfImpairedFinancingReceivableTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesImpairedReceivablesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": { "auth_ref": [ "r282" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.", "label": "Schedule of Net Benefit Costs [Table Text Block]", "terseLabel": "Components of Net Periodic Pension Income and Other Amounts Recognized in Other Comprehensive (Loss) Income" } } }, "localname": "ScheduleOfNetBenefitCostsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNonvestedPerformanceBasedUnitsActivityTableTextBlock": { "auth_ref": [ "r329" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the changes in outstanding nonvested performance-based units.", "label": "Performance Share Units" } } }, "localname": "ScheduleOfNonvestedPerformanceBasedUnitsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock": { "auth_ref": [ "r329" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the changes in outstanding nonvested restricted stock units.", "label": "Restricted Share Units" } } }, "localname": "ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "Summarization of information required and determined to be disclosed as a tabular roll forward of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income.", "label": "Investment [Table]" } } }, "localname": "ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable": { "auth_ref": [ "r20", "r240" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Property, Plant and Equipment [Table]" } } }, "localname": "ScheduleOfPropertyPlantAndEquipmentTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BankPremisesAndEquipmentDetails", "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRealizedGainLossTableTextBlock": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.", "label": "Schedule of Realized Gain (Loss) [Table Text Block]", "terseLabel": "Proceeds from Calls/Paydowns of Securities Available for Sale" } } }, "localname": "ScheduleOfRealizedGainLossTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": { "auth_ref": [ "r318", "r338" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about share-based payment arrangement.", "label": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]" } } }, "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShortTermDebtTable": { "auth_ref": [ "r23" ], "lang": { "en-US": { "role": { "documentation": "A table or schedule providing information pertaining to borrowings under which repayment was required in less than twelve months (or normal operating cycle, if longer) after its issuance. It may include: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date and measures of the maximum and average amount outstanding during the period; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.", "label": "Schedule of Short-term Debt [Table]" } } }, "localname": "ScheduleOfShortTermDebtTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShortTermDebtTextBlock": { "auth_ref": [ "r23" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.", "label": "Schedule of Short-term Debt [Table Text Block]", "terseLabel": "Short-Term Borrowings" } } }, "localname": "ScheduleOfShortTermDebtTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock": { "auth_ref": [ "r203" ], "lang": { "en-US": { "role": { "documentation": "For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).", "label": "Gross Unrealized Losses on Investment Securities and Related Fair Values in Unrealized Loss Position" } } }, "localname": "ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_SegmentReportingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Segment Reporting [Abstract]" } } }, "localname": "SegmentReportingAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SegmentReportingPolicyPolicyTextBlock": { "auth_ref": [ "r91" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for segment reporting.", "label": "Segment Reporting" } } }, "localname": "SegmentReportingPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r80" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows": { "order": 17.0, "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of noncash expense for share-based payment arrangement.", "label": "Share-based Payment Arrangement, Noncash Expense", "terseLabel": "Stock based compensation expense", "verboseLabel": "Stock based compensation expense" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": { "auth_ref": [ "r320" ], "lang": { "en-US": { "role": { "documentation": "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period", "terseLabel": "Options maximum term", "verboseLabel": "Options maximum term" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]", "terseLabel": "Additional Disclosures [Abstract]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod": { "auth_ref": [ "r327" ], "lang": { "en-US": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period", "negatedLabel": "Forfeited awards (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": { "auth_ref": [ "r331" ], "lang": { "en-US": { "role": { "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "New awards granted (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber": { "auth_ref": [ "r330" ], "lang": { "en-US": { "role": { "documentation": "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number", "periodEndLabel": "Balance, End of period (in shares)", "periodStartLabel": "Balance, Beginning of period (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Activity for Performance Based Awards [Roll Forward]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": { "auth_ref": [ "r332" ], "lang": { "en-US": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period", "negatedLabel": "Awards settled (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": { "auth_ref": [ "r338" ], "lang": { "en-US": { "role": { "documentation": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.", "label": "Shares available for grant (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Additional Disclosures [Abstract]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": { "auth_ref": [ "r325" ], "lang": { "en-US": { "role": { "documentation": "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.", "label": "Exercisable options, weighted average exercise price (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod": { "auth_ref": [ "r328" ], "lang": { "en-US": { "role": { "documentation": "Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period", "negatedLabel": "Expired options (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": { "auth_ref": [ "r327" ], "lang": { "en-US": { "role": { "documentation": "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period", "negatedLabel": "Options forfeited (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": { "auth_ref": [ "r338" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.", "label": "Intrinsic value of outstanding stock options" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": { "auth_ref": [ "r324", "r338" ], "lang": { "en-US": { "role": { "documentation": "Number of options outstanding, including both vested and non-vested options.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number", "periodEndLabel": "Ending balance (in shares)", "periodStartLabel": "Beginning balance (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Summary of Changes in Stock Option Awards [Roll Forward]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": { "auth_ref": [ "r323" ], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price", "periodEndLabel": "Ending balance (in dollars per share)", "periodStartLabel": "Beginning balance (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Weighted Average Exercise Price [Roll Forward]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber": { "auth_ref": [ "r335" ], "lang": { "en-US": { "role": { "documentation": "Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number", "periodEndLabel": "Ending balance (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue": { "auth_ref": [ "r333" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Intrinsic value of vested stock options" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAndExercisableTableTextBlock": { "auth_ref": [ "r333" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Summary of the Status of Stock Option Plans" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAndExercisableTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod": { "auth_ref": [ "r338" ], "lang": { "en-US": { "role": { "documentation": "Number of shares issued under share-based payment arrangement.", "label": "New options awarded (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward": { "auth_ref": [ "r319" ], "lang": { "en-US": { "role": { "documentation": "Description of terms of award under share-based payment arrangement.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award", "terseLabel": "Options maximum term" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": { "auth_ref": [ "r316", "r321" ], "lang": { "en-US": { "role": { "documentation": "Award under share-based payment arrangement.", "label": "Equity Award [Domain]" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails", "http://trustcobank.com/role/BenefitPlansValuationStockbasedCompensationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which option holders acquired shares when converting their stock options into shares.", "label": "Exercised options (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.", "label": "Expired options (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.", "label": "Options forfeited (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.", "label": "New options awarded (in dollars per share)" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy": { "auth_ref": [ "r91", "r318", "r322" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost.", "label": "Stock-Based Compensation Plans" } } }, "localname": "ShareBasedCompensationOptionAndIncentivePlansPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1": { "auth_ref": [ "r338" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Weighted average remaining contractual life, exercisable outstanding" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": { "auth_ref": [ "r334" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Weighted average remaining contractual life, options outstanding" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ShortTermBorrowings": { "auth_ref": [ "r6", "r438", "r490" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 1.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.", "label": "Amount outstanding", "verboseLabel": "Short-term borrowings" } } }, "localname": "ShortTermBorrowings", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShortTermBorrowingsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Short-term Debt [Abstract]" } } }, "localname": "ShortTermBorrowingsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Short-term Debt [Line Items]" } } }, "localname": "ShortTermDebtLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTextBlock": { "auth_ref": [ "r250" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for short-term debt.", "label": "Short-Term Borrowings" } } }, "localname": "ShortTermDebtTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowings" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShortTermDebtTypeAxis": { "auth_ref": [ "r23" ], "lang": { "en-US": { "role": { "documentation": "Information by type of short-term debt arrangement.", "label": "Short-term Debt, Type [Axis]" } } }, "localname": "ShortTermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeDomain": { "auth_ref": [ "r21" ], "lang": { "en-US": { "role": { "documentation": "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.", "label": "Short-term Debt, Type [Domain]" } } }, "localname": "ShortTermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShortTermDebtWeightedAverageInterestRate": { "auth_ref": [ "r22" ], "lang": { "en-US": { "role": { "documentation": "Weighted average interest rate of short-term debt outstanding calculated at point in time.", "label": "Weighted average interest rate, As of year end" } } }, "localname": "ShortTermDebtWeightedAverageInterestRate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_ShorttermDebtAverageOutstandingAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.", "label": "Average amount outstanding" } } }, "localname": "ShorttermDebtAverageOutstandingAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShorttermDebtFairValue": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.", "label": "Short-term Debt, Fair Value", "terseLabel": "Short-term borrowings" } } }, "localname": "ShorttermDebtFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueCarryingAmountsAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount": { "auth_ref": [ "r7" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.", "label": "Maximum amount outstanding at any month end" } } }, "localname": "ShorttermDebtMaximumMonthendOutstandingAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ShorttermBorrowingsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StandbyLettersOfCreditMember": { "auth_ref": [ "r246", "r248", "r370", "r504" ], "lang": { "en-US": { "role": { "documentation": "An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation.", "label": "Standby Letters of Credit [Member]" } } }, "localname": "StandbyLettersOfCreditMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StateAndLocalJurisdictionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Designated tax department of a state or local government entitled to levy and collect income taxes from the entity.", "label": "New York State [Member]" } } }, "localname": "StateAndLocalJurisdictionMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r27", "r252" ], "lang": { "en-US": { "role": { "documentation": "Information by component of equity.", "label": "Equity Components [Axis]", "terseLabel": "Equity Components [Axis]" } } }, "localname": "StatementEquityComponentsAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossReclassificationsOutOfAccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_StatementLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Statement [Line Items]" } } }, "localname": "StatementLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfCashFlowsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Consolidated Statements of Cash Flows [Abstract]", "terseLabel": "Statement of Cash Flows [Abstract]" } } }, "localname": "StatementOfCashFlowsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfFinancialPositionAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Consolidated Statements of Condition [Abstract]", "terseLabel": "Statement of Financial Position [Abstract]" } } }, "localname": "StatementOfFinancialPositionAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Consolidated Statements of Comprehensive Income [Abstract]", "verboseLabel": "Statements of Comprehensive Income [Abstract]" } } }, "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Consolidated Statements of Changes in Shareholders' Equity [Abstract]" } } }, "localname": "StatementOfStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.", "label": "Statement [Table]" } } }, "localname": "StatementTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval": { "auth_ref": [ "r94" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of dividends that can be declared or paid with approval of regulatory agency.", "label": "Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval", "terseLabel": "Statutory amount available for dividend payments with regulatory approval" } } }, "localname": "StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": { "auth_ref": [ "r10", "r11", "r252", "r253", "r326" ], "lang": { "en-US": { "role": { "documentation": "Number of share options (or share units) exercised during the current period.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period", "negatedLabel": "Exercised options (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansStockBasedCompensationPlansEquityAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued": { "auth_ref": [ "r11", "r252", "r253" ], "lang": { "en-US": { "role": { "documentation": "Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.", "label": "Sale of treasury stock (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesTreasuryStockReissued", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": { "auth_ref": [ "r27", "r252", "r253" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of stock issued as a result of the exercise of stock options.", "label": "Stock Issued During Period, Value, Stock Options Exercised", "terseLabel": "Stock options exercises" } } }, "localname": "StockIssuedDuringPeriodValueStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued": { "auth_ref": [ "r10", "r11", "r252", "r253", "r254" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.", "label": "Sale of treasury stock" } } }, "localname": "StockIssuedDuringPeriodValueTreasuryStockReissued", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquity": { "auth_ref": [ "r11", "r14", "r15", "r173" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 2.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.", "label": "Shareholders' equity", "periodEndLabel": "Balance", "periodStartLabel": "Balance", "totalLabel": "Total shareholders' equity" } } }, "localname": "StockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity", "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfConditionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "SHAREHOLDERS' EQUITY:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityNoteAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Accumulated Other Comprehensive Loss [Abstract]" } } }, "localname": "StockholdersEquityNoteAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityTotalMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Carrying amount as of the balance sheet date of total stockholders' equity, when it serves as a benchmark in a concentration of risk calculation. Also called Net Assets.", "label": "Stockholders' Equity [Member]" } } }, "localname": "StockholdersEquityTotalMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesConcentrationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Supplemental Disclosure of Cash Flow Information:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_SuppliesExpense": { "auth_ref": [ "r462" ], "calculation": { "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails": { "order": 1.0, "parentTag": "us-gaap_NoninterestExpense", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense associated with supplies that were used during the current accounting period.", "label": "Operating supplies" } } }, "localname": "SuppliesExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ParentCompanyOnlyStatementsOfComprehensiveIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense": { "auth_ref": [ "r366" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of reasonable estimate for income tax expense for which accounting for tax effect for remeasurement of deferred tax asset from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act.", "label": "Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense", "terseLabel": "Re-measurement of deferred tax asset, Provisional income tax expense" } } }, "localname": "TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/IncomeTaxesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect": { "auth_ref": [ "r39" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.", "label": "Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect", "terseLabel": "Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect" } } }, "localname": "TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/AccumulatedOtherComprehensiveLossDetails", "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_TierOneLeverageCapital": { "auth_ref": [ "r474", "r484" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.", "label": "Tier One Leverage Capital", "terseLabel": "Tier 1 leverage capital" } } }, "localname": "TierOneLeverageCapital", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets": { "auth_ref": [ "r474", "r477", "r484" ], "lang": { "en-US": { "role": { "documentation": "The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.", "label": "Tier One Leverage Capital Required for Capital Adequacy to Average Assets", "terseLabel": "Tier 1 leverage ratio, minimum for capital adequacy plus capital conservation" } } }, "localname": "TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets": { "auth_ref": [ "r474" ], "lang": { "en-US": { "role": { "documentation": "The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.", "label": "Tier One Leverage Capital Required to be Well Capitalized to Average Assets", "terseLabel": "Tier 1 leverage ratio, well capitalized" } } }, "localname": "TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TierOneLeverageCapitalToAverageAssets": { "auth_ref": [ "r474", "r484" ], "lang": { "en-US": { "role": { "documentation": "Tier 1 Leverage Capital divided by average assets as defined in the regulations.", "label": "Tier One Leverage Capital to Average Assets", "terseLabel": "Tier 1 leverage ratio, ratio" } } }, "localname": "TierOneLeverageCapitalToAverageAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TierOneRiskBasedCapital": { "auth_ref": [ "r474", "r484" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Tier 1 Risk Based Capital as defined in the regulations.", "label": "Tier 1 risk-based capital" } } }, "localname": "TierOneRiskBasedCapital", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TierOneRiskBasedCapitalAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Tier One Risk Based Capital [Abstract]" } } }, "localname": "TierOneRiskBasedCapitalAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets": { "auth_ref": [ "r474", "r477", "r484" ], "lang": { "en-US": { "role": { "documentation": "The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.", "label": "Tier 1 risk-based capital, minimum for capital adequacy plus capital conservation" } } }, "localname": "TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets": { "auth_ref": [ "r474" ], "lang": { "en-US": { "role": { "documentation": "The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as \"well capitalized\" under the regulatory framework for prompt corrective action.", "label": "Tier 1 risk-based capital, well capitalized" } } }, "localname": "TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets": { "auth_ref": [ "r474", "r484" ], "lang": { "en-US": { "role": { "documentation": "Tier 1 capital divided by risk weighted assets as defined by regulations.", "label": "Tier 1 risk-based capital, ratio" } } }, "localname": "TierOneRiskBasedCapitalToRiskWeightedAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RegulatoryCapitalRequirementsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_TimeDepositMaturitiesAfterYearFive": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 6.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing after the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Over 5 years" } } }, "localname": "TimeDepositMaturitiesAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDepositMaturitiesTableTextBlock": { "auth_ref": [ "r249" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of time deposit liability maturities.", "label": "Time Deposit Maturities [Table Text Block]", "terseLabel": "Maturity of Total Time Deposits" } } }, "localname": "TimeDepositMaturitiesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_TimeDepositMaturitiesYearFive": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 5.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing in the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "4 to 5 years" } } }, "localname": "TimeDepositMaturitiesYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDepositMaturitiesYearFour": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 4.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Time Deposit Maturities, Year Four", "terseLabel": "3 to 4 years" } } }, "localname": "TimeDepositMaturitiesYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDepositMaturitiesYearOne": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 1.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Under 1 year" } } }, "localname": "TimeDepositMaturitiesYearOne", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDepositMaturitiesYearThree": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 3.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "2 to 3 years" } } }, "localname": "TimeDepositMaturitiesYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDepositMaturitiesYearTwo": { "auth_ref": [ "r249" ], "calculation": { "http://trustcobank.com/role/DepositsDetails": { "order": 2.0, "parentTag": "us-gaap_TimeDeposits", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "1 to 2 years" } } }, "localname": "TimeDepositMaturitiesYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TimeDeposits": { "auth_ref": [ "r446", "r472" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 4.0, "parentTag": "us-gaap_Deposits", "weight": 1.0 }, "http://trustcobank.com/role/DepositsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of time deposit liabilities, including certificates of deposit.", "label": "Time accounts", "totalLabel": "Total time deposits" } } }, "localname": "TimeDeposits", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition", "http://trustcobank.com/role/DepositsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransferToOtherRealEstate": { "auth_ref": [ "r87", "r88", "r89" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.", "label": "Transfer of loans to real estate owned" } } }, "localname": "TransferToOtherRealEstate", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": { "auth_ref": [ "r432" ], "lang": { "en-US": { "role": { "documentation": "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.", "label": "Financial Instruments [Domain]", "terseLabel": "Financial Instruments [Domain]" } } }, "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesMaturitiesDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesHeldtomaturitySecuritiesMaturityDetails", "http://trustcobank.com/role/OffbalanceSheetFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockMember": { "auth_ref": [ "r26", "r254" ], "lang": { "en-US": { "role": { "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.", "label": "Treasury Stock [Member]" } } }, "localname": "TreasuryStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockShares": { "auth_ref": [ "r26", "r254" ], "lang": { "en-US": { "role": { "documentation": "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.", "label": "Treasury stock, at cost (in shares)" } } }, "localname": "TreasuryStockShares", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfConditionParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockSharesAcquired": { "auth_ref": [ "r11", "r252", "r253" ], "lang": { "en-US": { "role": { "documentation": "Number of shares that have been repurchased during the period and are being held in treasury.", "label": "Treasury Stock, Shares, Acquired", "terseLabel": "Purchase of treasury stock (in shares)" } } }, "localname": "TreasuryStockSharesAcquired", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockValue": { "auth_ref": [ "r26", "r254", "r255" ], "calculation": { "http://trustcobank.com/role/ConsolidatedStatementsOfCondition": { "order": 4.0, "parentTag": "us-gaap_StockholdersEquity", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.", "label": "Treasury Stock, Value", "negatedLabel": "Treasury stock: 3,283,175 and 3,516,440 shares, at cost, at December 31, 2019 and 2018, respectively" } } }, "localname": "TreasuryStockValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfCondition" ], "xbrltype": "monetaryItemType" }, "us-gaap_TreasuryStockValueAcquiredCostMethod": { "auth_ref": [ "r252", "r253", "r254" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.", "label": "Treasury Stock, Value, Acquired, Cost Method", "negatedLabel": "Purchase of treasury stock" } } }, "localname": "TreasuryStockValueAcquiredCostMethod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock": { "auth_ref": [ "r162", "r164" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of financing receivable modified as troubled debt restructuring.", "label": "Modified Loans by Class That Were Determined to be TDR's" } } }, "localname": "TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/LoansAndAllowanceForLoanLossesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_TypeOfAdoptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.", "label": "Type of Adoption [Domain]" } } }, "localname": "TypeOfAdoptionMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/RecentAccountingPronouncementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember": { "auth_ref": [ "r278", "r441" ], "lang": { "en-US": { "role": { "documentation": "Debentures, bonds and other debt securities issued by US government sponsored entities (GSEs), for example, but not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB). Excludes debt issued by the Government National Mortgage Association (GNMA or Ginnie Mae).", "label": "U. S. Government Sponsored Enterprises [Member]", "verboseLabel": "U. S. Government Sponsored Enterprises [Member]" } } }, "localname": "USGovernmentSponsoredEnterprisesDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesGrossUnrealizedLossPositionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USStatesAndPoliticalSubdivisionsMember": { "auth_ref": [ "r278", "r501" ], "lang": { "en-US": { "role": { "documentation": "Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.", "label": "State and Political Subdivisions [Member]", "terseLabel": "State and Political Subdivisions [Member]" } } }, "localname": "USStatesAndPoliticalSubdivisionsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BenefitPlansFairValueOfPlanAssetsDetails", "http://trustcobank.com/role/InvestmentSecuritiesAvailableforsaleSecuritiesAmortizedCostAndFairValueDetails" ], "xbrltype": "domainItemType" }, "us-gaap_UseOfEstimates": { "auth_ref": [ "r121", "r122", "r123", "r124", "r129", "r130", "r131" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.", "label": "Use of Estimates" } } }, "localname": "UseOfEstimates", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/BasisOfPresentationPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ValuationTechniqueAxis": { "auth_ref": [ "r385" ], "lang": { "en-US": { "role": { "documentation": "Information by valuation approach and technique.", "label": "Valuation Approach and Technique [Axis]" } } }, "localname": "ValuationTechniqueAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ValuationTechniqueDomain": { "auth_ref": [ "r385" ], "lang": { "en-US": { "role": { "documentation": "Valuation approach and technique.", "label": "Valuation Approach and Technique [Domain]" } } }, "localname": "ValuationTechniqueDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/FairValueAssetsMeasuredAtFairValueNonrecurringDetails" ], "xbrltype": "domainItemType" }, "us-gaap_VariableLeaseCost": { "auth_ref": [ "r415", "r422" ], "calculation": { "http://trustcobank.com/role/OperatingLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.", "label": "Variable lease cost" } } }, "localname": "VariableLeaseCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/OperatingLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": { "auth_ref": [ "r110", "r115" ], "calculation": { "http://trustcobank.com/role/EarningsPerShareDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "lang": { "en-US": { "role": { "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.", "label": "Weighted Average Number of Shares Outstanding, Diluted", "totalLabel": "Weighted average common shares including potential dilutive shares (in shares)" } } }, "localname": "WeightedAverageNumberOfDilutedSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": { "auth_ref": [ "r109", "r115" ], "calculation": { "http://trustcobank.com/role/EarningsPerShareDetails": { "order": 0.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.", "label": "Weighted average common shares (in shares)" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingBasic", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://trustcobank.com/role/EarningsPerShareDetails" ], "xbrltype": "sharesItemType" } }, "unitCount": 9 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "205", "URI": "http://asc.fasb.org/topic&trid=2122149" }, "r1": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765" }, "r10": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(28))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.12-04)", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690" }, "r101": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r102": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794" }, "r103": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794" }, "r104": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794" }, "r105": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794" }, "r106": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794" }, "r107": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794" }, "r108": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "250", "URI": "http://asc.fasb.org/topic&trid=2122394" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256" }, "r11": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(29))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "28A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256" }, "r114": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256" }, "r115": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r116": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r117": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r118": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257" }, "r119": { "Name": "Accounting Standards Codification", "Paragraph": "52", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258" }, "r12": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r120": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "260", "URI": "http://asc.fasb.org/topic&trid=2144383" }, "r121": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r122": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r123": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592" }, "r124": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592" }, "r125": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592" }, "r127": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592" }, "r128": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592" }, "r129": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592" }, "r13": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r130": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592" }, "r132": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "275", "URI": "http://asc.fasb.org/topic&trid=2134479" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r135": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r137": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r138": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599" }, "r139": { "Name": "Accounting Standards Codification", "Paragraph": "40", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599" }, "r14": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r140": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599" }, "r141": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522" }, "r142": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4437-111522" }, "r143": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5162-111524" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r145": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r146": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r147": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(3)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r148": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(4)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r15": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(31))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r150": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r151": { "Name": "Accounting Standards Codification", "Paragraph": "11B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524" }, "r152": { "Name": "Accounting Standards Codification", "Paragraph": "14A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524" }, "r153": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(3)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524" }, "r154": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(4)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524" }, "r155": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b,d)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524" }, "r157": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524" }, "r158": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5033-111524" }, "r16": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(32))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953659-111524" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5066-111524" }, "r162": { "Name": "Accounting Standards Codification", "Paragraph": "33", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524" }, "r163": { "Name": "Accounting Standards Codification", "Paragraph": "34", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "34", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524" }, "r166": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5086-111524" }, "r167": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5093-111524" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524" }, "r169": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524" }, "r17": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.1)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r170": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "7A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524" }, "r172": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5144-111524" }, "r173": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 4.E)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707" }, "r174": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 6.L.1)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707" }, "r175": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/subtopic&trid=2196772" }, "r176": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10133-111534" }, "r177": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10149-111534" }, "r178": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10178-111534" }, "r179": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "20", "Topic": "310", "URI": "http://asc.fasb.org/subtopic&trid=2196816" }, "r18": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.13(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r180": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)(1)(ii)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544" }, "r181": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562" }, "r182": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562" }, "r183": { "Name": "Accounting Standards Codification", "Paragraph": "8A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562" }, "r184": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6283291-111563" }, "r185": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563" }, "r186": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(aa)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563" }, "r187": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563" }, "r188": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563" }, "r19": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.13)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r190": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563" }, "r191": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563" }, "r192": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563" }, "r193": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563" }, "r194": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r195": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(aa)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r196": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563" }, "r2": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r20": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.14)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563" }, "r202": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27340-111563" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "8B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563" }, "r209": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "320", "URI": "http://asc.fasb.org/topic&trid=2196928" }, "r21": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r210": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118950378&loc=SL82887624-210437" }, "r211": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447" }, "r214": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447" }, "r218": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447" }, "r22": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921830-210448" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921833-210448" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921835-210448" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(d)(1)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921835-210448" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(d)(2)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921835-210448" }, "r225": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921842-210448" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "79", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448" }, "r227": { "Name": "Accounting Standards Codification", "Paragraph": "80", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448" }, "r228": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454" }, "r229": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455" }, "r23": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r230": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455" }, "r231": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(2)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456" }, "r237": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r238": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r239": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r24": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19-26)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r240": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r241": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230" }, "r242": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "360", "URI": "http://asc.fasb.org/topic&trid=2155823" }, "r243": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r244": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349" }, "r245": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r246": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248" }, "r247": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(4)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248" }, "r248": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=118956092&loc=d3e12803-110250" }, "r249": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.25)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r250": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r251": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(1)", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879" }, "r252": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644" }, "r253": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3-04)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770" }, "r254": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655" }, "r255": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656" }, "r256": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045" }, "r257": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045" }, "r258": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046" }, "r259": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046" }, "r26": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29,30)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r260": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "606", "URI": "http://asc.fasb.org/topic&trid=49130388" }, "r261": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "710", "URI": "http://asc.fasb.org/topic&trid=2127225" }, "r262": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r263": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r264": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "712", "URI": "http://asc.fasb.org/topic&trid=2197446" }, "r265": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919" }, "r266": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r267": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r268": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r269": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r27": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29-31)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r270": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(6)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r271": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r272": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r273": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r274": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r275": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r276": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r277": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(i)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r278": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(ii)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r279": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(01)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r28": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.3,4)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r280": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r281": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(f)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r282": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r283": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r284": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r285": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r286": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r287": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r288": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(i)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r289": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(i),(j)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r29": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r290": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(j)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r291": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(k)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r292": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(k)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r293": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(k)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r294": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(m)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r295": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(n)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r296": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(s)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r297": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r298": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(13))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r30": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r303": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r304": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r305": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r306": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r307": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r308": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921" }, "r309": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=6412939&loc=d3e15145-114933" }, "r31": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r310": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "60", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963" }, "r311": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "60", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964" }, "r312": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "70", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942" }, "r313": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=d3e29149-114947" }, "r314": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "715", "URI": "http://asc.fasb.org/topic&trid=2235017" }, "r315": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899" }, "r316": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r317": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r318": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r319": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r32": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r320": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r321": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a),(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r322": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b),(f)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r323": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r324": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r325": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r326": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r327": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r328": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(4)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r329": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r33": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(i),(j),(k)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r330": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r331": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r332": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r333": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r334": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r335": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r336": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r337": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r338": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r339": { "Name": "Accounting Standards Codification", "Paragraph": "2A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901" }, "r34": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(i-k)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r340": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907" }, "r341": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907" }, "r342": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "718", "URI": "http://asc.fasb.org/topic&trid=2228938" }, "r343": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "35", "Subparagraph": "(b)", "Topic": "720", "URI": "http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848" }, "r344": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314" }, "r345": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314" }, "r346": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32059-109318" }, "r347": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32247-109318" }, "r348": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32280-109318" }, "r349": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319" }, "r35": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(j)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r350": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319" }, "r351": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319" }, "r352": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319" }, "r353": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r354": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319" }, "r355": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319" }, "r356": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319" }, "r357": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319" }, "r358": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319" }, "r359": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319" }, "r36": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r360": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319" }, "r361": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319" }, "r362": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319" }, "r363": { "Name": "Accounting Standards Codification", "Paragraph": "217", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=117331294&loc=d3e36027-109320" }, "r364": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 6.I)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817" }, "r365": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 6.I.7)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817" }, "r366": { "Name": "Accounting Standards Codification", "Paragraph": "2A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.EE.Q2(b))", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817" }, "r367": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324" }, "r368": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "05", "SubTopic": "30", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=65884525&loc=d3e40913-109327" }, "r369": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "740", "URI": "http://asc.fasb.org/topic&trid=2144680" }, "r37": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580" }, "r370": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(f)(2)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=116873149&loc=d3e923-111674" }, "r371": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=d3e5283-111683" }, "r372": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683" }, "r373": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683" }, "r374": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=d3e5614-111684" }, "r375": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r376": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c),(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r377": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3A-02)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=116822174&loc=d3e355033-122828" }, "r378": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3A-03)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=116822174&loc=d3e355100-122828" }, "r379": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "810", "URI": "http://asc.fasb.org/topic&trid=2197479" }, "r38": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580" }, "r380": { "Name": "Accounting Standards Codification", "Paragraph": "4K", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(4)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959" }, "r381": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Subparagraph": "(a)(2)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008" }, "r382": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r383": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r384": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bb)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r385": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r386": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)(1)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r387": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)(2)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r388": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r389": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258" }, "r39": { "Name": "Accounting Standards Codification", "Paragraph": "12A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580" }, "r390": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258" }, "r391": { "Name": "Accounting Standards Codification", "Paragraph": "6A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258" }, "r392": { "Name": "Accounting Standards Codification", "Paragraph": "6A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258" }, "r393": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "60", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260" }, "r394": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=116690757&loc=d3e13220-108610" }, "r395": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13279-108611" }, "r396": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611" }, "r397": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611" }, "r398": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13476-108611" }, "r399": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611" }, "r4": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(14))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r40": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580" }, "r400": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611" }, "r401": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611" }, "r402": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13572-108611" }, "r403": { "Name": "Accounting Standards Codification", "Paragraph": "23", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13587-108611" }, "r404": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906" }, "r405": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391" }, "r406": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399" }, "r407": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737" }, "r408": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984" }, "r409": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977" }, "r41": { "Name": "Accounting Standards Codification", "Paragraph": "14A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580" }, "r410": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977" }, "r411": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977" }, "r412": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980" }, "r413": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980" }, "r414": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r415": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r416": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(1)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r417": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(2)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r418": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r419": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(4)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r42": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580" }, "r420": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r421": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980" }, "r422": { "Name": "Accounting Standards Codification", "Paragraph": "53", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971" }, "r423": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/subtopic&trid=77888251" }, "r424": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864" }, "r425": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864" }, "r426": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864" }, "r427": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864" }, "r428": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719" }, "r429": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(1)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719" }, "r43": { "Name": "Accounting Standards Codification", "Paragraph": "17A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580" }, "r430": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719" }, "r431": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719" }, "r432": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "50", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746" }, "r433": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "940", "URI": "http://asc.fasb.org/subtopic&trid=2176304" }, "r434": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "210", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117340910&loc=d3e59706-112781" }, "r435": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(1))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r436": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(10))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r437": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(11))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r438": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(13))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r439": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(15)(5))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r44": { "Name": "Accounting Standards Codification", "Paragraph": "17B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580" }, "r440": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r441": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(6)(a)(1))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r442": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(6))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r443": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(7)(d))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r444": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(7)(e)(1)(i))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r445": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.10(4))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r446": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.12)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r447": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.17)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r448": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.2)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r449": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.7(d))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r45": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r450": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.7(e))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r451": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.7)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r452": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(22))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r453": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r454": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.1)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r455": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.1-5)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r456": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.10)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r457": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.11)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r458": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.12)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r459": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.13)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r46": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r460": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.14(b))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r461": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.14(d))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r462": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.14)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r463": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.6)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r464": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.7)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r465": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.9)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r466": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Subparagraph": "(b)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784" }, "r467": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(a)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803" }, "r468": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(b)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803" }, "r469": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Subparagraph": "(c)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803" }, "r47": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r470": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62652-112803" }, "r471": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "942", "URI": "http://asc.fasb.org/subtopic&trid=2209399" }, "r472": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "405", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818" }, "r473": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822" }, "r474": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Subparagraph": "(c)(1)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826" }, "r475": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826" }, "r476": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958569-112826" }, "r477": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826" }, "r478": { "Name": "Accounting Standards Codification", "Paragraph": "1C", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958572-112826" }, "r479": { "Name": "Accounting Standards Codification", "Paragraph": "1D", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958573-112826" }, "r48": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580" }, "r480": { "Name": "Accounting Standards Codification", "Paragraph": "1E", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958574-112826" }, "r481": { "Name": "Accounting Standards Codification", "Paragraph": "1F", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958575-112826" }, "r482": { "Name": "Accounting Standards Codification", "Paragraph": "1G", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826" }, "r483": { "Name": "Accounting Standards Codification", "Paragraph": "1H", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Subparagraph": "(c)(1)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826" }, "r484": { "Name": "Accounting Standards Codification", "Paragraph": "1H", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Subparagraph": "(c)(2)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826" }, "r485": { "Name": "Accounting Standards Codification", "Paragraph": "1H", "Publisher": "FASB", "Section": "50", "SubTopic": "505", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826" }, "r486": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(1))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r487": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(10))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r488": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(12))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r489": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(15)(a))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r49": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580" }, "r490": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(16)(a)(1))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r491": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r492": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(25))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r493": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(8))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r494": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03.(a),19)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r495": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03.3)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r496": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(18))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263" }, "r497": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(19))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263" }, "r498": { "Name": "Accounting Standards Codification", "Paragraph": "4H", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438" }, "r499": { "Name": "Accounting Standards Codification", "Paragraph": "13H", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Subparagraph": "(a)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(17))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r50": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580" }, "r500": { "Name": "Accounting Standards Codification", "Paragraph": "13H", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Subparagraph": "(b)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441" }, "r501": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(e)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473" }, "r502": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "825", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195" }, "r503": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.6-03(f))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=6488002&loc=d3e600178-122990" }, "r504": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=66023616&loc=SL35737432-115832" }, "r505": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "220", "Subparagraph": "(k)", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=118262090&loc=SL114874205-224268" }, "r506": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.6-07.2(a),(b),(c),(d))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=116637345&loc=SL114874292-224272" }, "r507": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12)", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010" }, "r508": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-14(2))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010" }, "r509": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-14(6))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010" }, "r51": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116657188&loc=SL116659661-227067" }, "r510": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-14(Column C))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010" }, "r511": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "946", "URI": "http://asc.fasb.org/subtopic&trid=2324412" }, "r512": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "948", "URI": "http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998" }, "r513": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "948", "URI": "http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998" }, "r514": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "310", "Subparagraph": "(SX 210.12-29(Footnote 4))", "Topic": "948", "URI": "http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014" }, "r515": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "740", "Topic": "954", "URI": "http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650" }, "r516": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Footnote 2))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024" }, "r517": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Footnote 4))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024" }, "r518": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b" }, "r519": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "d1-1" }, "r52": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581" }, "r520": { "Name": "Forms 10-K, 10-Q, 20-F", "Number": "240", "Publisher": "SEC", "Section": "13", "Subsection": "a-1-" }, "r521": { "Name": "Forms 10-K, 20-F, 40-F", "Number": "240", "Publisher": "SEC", "Section": "15", "Subsection": "d-1" }, "r522": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r523": { "Name": "Regulation S-T", "Number": "232", "Publisher": "SEC", "Section": "405" }, "r524": { "Footnote": "2", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r525": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r526": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "29" }, "r527": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "(a)", "Publisher": "SEC", "Section": "12", "Subsection": "04" }, "r528": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "a", "Publisher": "SEC", "Section": "12", "Subsection": "04" }, "r529": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "i", "Publisher": "SEC", "Section": "3", "Subsection": "10" }, "r53": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(210.5-03(11))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r54": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(1))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r55": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(20))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(21))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r57": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(7)(c))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r58": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(9)(a))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r59": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(b)(4))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r6": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(19)(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.1)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r61": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.3)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.4)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.6)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r64": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "220", "URI": "http://asc.fasb.org/topic&trid=2134417" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585" }, "r67": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a),(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585" }, "r68": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585" }, "r7": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(19))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a),(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585" }, "r71": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585" }, "r73": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585" }, "r74": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585" }, "r76": { "Name": "Accounting Standards Codification", "Paragraph": "24", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585" }, "r77": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585" }, "r78": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585" }, "r79": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585" }, "r8": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(20))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r80": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585" }, "r81": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585" }, "r82": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585" }, "r83": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585" }, "r84": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3095-108585" }, "r85": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586" }, "r86": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586" }, "r87": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586" }, "r88": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586" }, "r89": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586" }, "r9": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(24))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r90": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586" }, "r91": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790" }, "r92": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(h))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r93": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(b))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r94": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(e))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r95": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(1)(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r96": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(2))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r97": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(k)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r98": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX210.4-08(b))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r99": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.12-04(a))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690" } }, "version": "2.1" }