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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Tax (expense) benefit on net unrealized gains (losses) arising during the period $ (9,694)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 26,294us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ (75)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Tax benefit of amortization of net unrealized holding gains to income 1,950nbhc_OtherComprehensiveIncomeAmortizationOfNetUnrealizedHoldingGainsToIncomeDuringPeriodTax 3,567nbhc_OtherComprehensiveIncomeAmortizationOfNetUnrealizedHoldingGainsToIncomeDuringPeriodTax 3,571nbhc_OtherComprehensiveIncomeAmortizationOfNetUnrealizedHoldingGainsToIncomeDuringPeriodTax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 263us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax 0us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax (15,159)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Portion $ 0nbhc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTaxPortion $ 0nbhc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTaxPortion $ (15,159)nbhc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTaxPortion