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Investment Securities, Available-for-sale Securities, Transaction Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses [Abstract]    
Proceeds from sales $ 22,945us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from calls 29,680trst_ProceedsFromPrepaymentsAndCallsOfAvailableForSaleSecurities 141,322trst_ProceedsFromPrepaymentsAndCallsOfAvailableForSaleSecurities
Gross realized gains 249us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 6us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Income tax expense recognized on net gains on sales and calls of securities available for sale $ 100us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax $ 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax