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Investments in Securities and Fair Value Schedule of Assumptions Used to Determine Fair Value (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Cumulative probability of earning maximum rate until maturity 0.00%itic_PercentageOfCumulativeProbabilityOfEarningMaximumRateUntilMaturity 0.00%itic_PercentageOfCumulativeProbabilityOfEarningMaximumRateUntilMaturity
Cumulative probability of principle returned prior to maturity 95.20%itic_PercentageOfCumulativeProbabilityOfPrincipleReturnedPriorToMaturity 95.60%itic_PercentageOfCumulativeProbabilityOfPrincipleReturnedPriorToMaturity
Cumulative probability of default at some future point 4.80%itic_PercentageOfCumulativeProbabilityOfDefaultAtSomeFuturePoint 4.40%itic_PercentageOfCumulativeProbabilityOfDefaultAtSomeFuturePoint