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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities Sold under Agreements to Repurchase	$ 92,446us-gaap_SecuritiesSoldUnderAgreementsToRepurchase	$ 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	107,158us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Securities for Reverse Repurchase Agreements	298,466us-gaap_SecuritiesForReverseRepurchaseAgreements	300,350us-gaap_SecuritiesForReverseRepurchaseAgreements
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	338,929us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	344,169us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	212,946us-gaap_SecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	93,000us-gaap_SecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities for Reverse Repurchase Agreements	314,160us-gaap_SecuritiesForReverseRepurchaseAgreements / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	310,781us-gaap_SecuritiesForReverseRepurchaseAgreements / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	$ 201,050us-gaap_SecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	$ 93,000us-gaap_SecuritiesBorrowed / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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