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Loans and Allowance for Loan Losses, Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Allowance for loan losses by portfolio segment [Roll Forward]    
Balance at beginning of period $ 46,327us-gaap_LoansAndLeasesReceivableAllowance $ 47,714us-gaap_LoansAndLeasesReceivableAllowance
Loans charged off [Abstract]    
Total loan charge offs 1,316us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 2,316us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries of loans previously charged off [Abstract]    
Total recoveries 133us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery 137us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Net loans charged off 1,183trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff 2,179trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
Provision (credit) for loan losses 800us-gaap_ProvisionForLoanAndLeaseLosses 1,500us-gaap_ProvisionForLoanAndLeaseLosses
Balance at end of period 45,944us-gaap_LoansAndLeasesReceivableAllowance 47,035us-gaap_LoansAndLeasesReceivableAllowance
Commercial [Member]    
Allowance for loan losses by portfolio segment [Roll Forward]    
Balance at beginning of period 4,071us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 4,019us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loans charged off [Abstract]    
Total loan charge offs 50us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 873us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 17us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 19us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Net loans charged off 33trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 854trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Provision (credit) for loan losses (14)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 675us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Balance at end of period 4,024us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 3,840us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Real Estate Mortgage - 1 to 4 Family [Member]    
Allowance for loan losses by portfolio segment [Roll Forward]    
Balance at beginning of period 42,088us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 43,597us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Loans charged off [Abstract]    
Total loan charge offs 1,223us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 1,392us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 110us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 113us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Net loans charged off 1,113trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 1,279trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Provision (credit) for loan losses 554us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 773us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Balance at end of period 41,529us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 43,091us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Installment [Member]    
Allowance for loan losses by portfolio segment [Roll Forward]    
Balance at beginning of period 168us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 98us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Loans charged off [Abstract]    
Total loan charge offs 43us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 51us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 5us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Net loans charged off 37trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 46trst_FinancingReceivableAllowanceOfCreditLossesNetLoansChargedOff
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Provision (credit) for loan losses 260us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 52us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Balance at end of period 391us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 104us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
New York and Other States [Member]    
Loans charged off [Abstract]    
Total loan charge offs 1,207us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 1,234us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]
Recoveries of loans previously charged off [Abstract]    
Total recoveries 132us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 97us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]
New York and Other States [Member] | Commercial [Member]    
Loans charged off [Abstract]    
Total loan charge offs 50us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1] 260us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
Recoveries of loans previously charged off [Abstract]    
Total recoveries 16us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1] 18us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [1]
New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loans charged off [Abstract]    
Total loan charge offs 1,114us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 [1] 925us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 [1]
Recoveries of loans previously charged off [Abstract]    
Total recoveries 110us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 [1] 74us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 [1]
New York and Other States [Member] | Installment [Member]    
Loans charged off [Abstract]    
Total loan charge offs 43us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 [1] 49us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 [1]
Recoveries of loans previously charged off [Abstract]    
Total recoveries 6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 [1] 5us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 [1]
Florida [Member]    
Loans charged off [Abstract]    
Total loan charge offs 109us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 1,082us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 40us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
Florida [Member] | Commercial [Member]    
Loans charged off [Abstract]    
Total loan charge offs 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 613us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loans charged off [Abstract]    
Total loan charge offs 109us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 467us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 39us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Florida [Member] | Installment [Member]    
Loans charged off [Abstract]    
Total loan charge offs 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 2us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Recoveries of loans previously charged off [Abstract]    
Total recoveries $ 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 $ 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
[1] Includes New York, New Jersey, Vermont and Massachusetts.