Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Net unrealized gains on securities $ 67,682us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 82,408us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net unrealized losses on derivatives designated as cash flow hedges (1,817)nct_DerivativeInstrumentsAccumulatedOtherComprehensiveIncome (5,992)nct_DerivativeInstrumentsAccumulatedOtherComprehensiveIncome
Net unrecognized gain and prior service cost   458us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive income $ 65,865us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 76,874us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax