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Unaudited Condensed Consolidated Statements of Comprehensive Income (Parentheticals) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Unrealized holding gain (loss) on available for sale securities arising during the period on securities held at end of period, tax $ 1,023us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 1,957us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for prior period unrealized (gain) loss previously reported in other comprehensive income recognized during current period, tax 39us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (27)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Change in unfunded portion of postretirement benefit obligations, tax $ (665)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 12us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax