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Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Available-for-sale securities:    
Change in net unrealized gain/loss during the period $ 9,320us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 8,815us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income (290)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1] (94)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1]
Net unrealized gains 9,030us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 8,721us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Employee benefit plans:    
Amortization of net retirement plan actuarial loss 731us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1],[2] 320us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1],[2]
Amortization of net retirement plan prior service cost (179)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1],[2] 14us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1],[2]
Employee benefit plans 552us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax [1],[2] 334us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax [1],[2]
Other comprehensive (loss) income 9,582us-gaap_OtherComprehensiveIncomeLossBeforeTax 9,055us-gaap_OtherComprehensiveIncomeLossBeforeTax
Available-for-sale securities:    
Change in net unrealized gain/loss during the period (3,728)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (3,525)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income 116us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax [1] 38us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax [1]
Net unrealized gains (3,612)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (3,487)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Employee benefit plans:    
Amortization of net retirement plan actuarial loss (293)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax (128)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Amortization of net retirement plan prior service cost 72us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax (6)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax
Employee benefit plans (221)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax [1],[2] (134)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax [1],[2]
Other comprehensive (loss) income (3,833)us-gaap_OtherComprehensiveIncomeLossTax (3,621)us-gaap_OtherComprehensiveIncomeLossTax
Available-for-sale securities:    
Change in net unrealized gain/loss during the period 5,592us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 5,290us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Amounts reclassified from accumulated other comprehensive (loss) income (174)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] (56)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
Net unrealized gains 5,418us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 5,234us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Employee benefit plans:    
Amortization of net retirement plan actuarial loss 438us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 192us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of net retirement plan prior service cost 107us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax (8)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Employee benefit plans 331us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1],[2] 200us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1],[2]
Other comprehensive income $ 5,749us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 5,434us-gaap_OtherComprehensiveIncomeLossNetOfTax
[1] Amounts in parentheses indicated debits in income statement
[2] The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - "Employee Benefit Plan")