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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Contract
Mar. 31, 2014
Contract
Dec. 31, 2014
Real Estate Mortgage - 1 to 4 Family [Member]      
Financing Receivable, Modifications [Line Items]      
TDR's classifications from previously performing loans $ 10,400,000trst_TdrSClassificationsFromPreviouslyPerformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		   $ 9,900,000trst_TdrSClassificationsFromPreviouslyPerformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 13us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 10us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]  
Pre-Modification Outstanding Recorded Investment 2,300,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 1,504,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]  
Post-Modification Outstanding Recorded Investment 2,300,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 1,504,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]  
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1] 245,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember		 [1]  
New York and Other States [Member] | First Mortgages [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 11us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1] 8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1]  
Pre-Modification Outstanding Recorded Investment 2,240,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1] 1,378,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1]  
Post-Modification Outstanding Recorded Investment 2,240,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1] 1,378,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1]  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1] 4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1]  
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1] 245,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 [1]  
New York and Other States [Member] | Home Equity Loans [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1] 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1]  
Pre-Modification Outstanding Recorded Investment 10,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1] 4,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1]  
Post-Modification Outstanding Recorded Investment 10,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1] 4,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1]  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1] 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1]  
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1] 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 [1]  
New York and Other States [Member] | Home Equity Lines of Credit [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1] 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1]  
Pre-Modification Outstanding Recorded Investment 50,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1] 122,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1]  
Post-Modification Outstanding Recorded Investment 50,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1] 122,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1]  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1] 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1]  
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1] 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_NewYorkAndOtherStatesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 [1]  
Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		  
Pre-Modification Outstanding Recorded Investment 207,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 527,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		  
Post-Modification Outstanding Recorded Investment 207,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 527,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		  
Recorded Investment 50,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		 280,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember		  
Florida [Member] | First Mortgages [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		  
Pre-Modification Outstanding Recorded Investment 157,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 173,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		  
Post-Modification Outstanding Recorded Investment 157,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 173,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		  
Recorded Investment 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FirstMortgageMember		  
Florida [Member] | Home Equity Loans [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		  
Pre-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		  
Post-Modification Outstanding Recorded Investment 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trst_HomeEquityLoansMember		  
Florida [Member] | Home Equity Lines of Credit [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		  
Pre-Modification Outstanding Recorded Investment 50,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 354,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		  
Post-Modification Outstanding Recorded Investment 50,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 354,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		  
Loans modified for which there was payment default [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		  
Recorded Investment $ 50,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 $ 280,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ dei_EntityByLocationAxis
= trst_FloridaStateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		  
[1] Includes New York, New Jersey, Vermont and Massachusetts.