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Repurchase Agreements Repurchase Agreements (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | $ 386,800,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral | $ 418,300,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Securities Sold under Agreements to Repurchase | 365,283,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 324,425,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities Sold under Agreements to Repurchase, Gross | 365,283,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | 324,425,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 6,909,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 6,914,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 358,374,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 186,010,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 131,501,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Overnight and continuous |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 335,283,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember | 294,425,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember
Overnight and continuous | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Overnight and continuous | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 335,283,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 162,924,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Overnight and continuous | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 131,501,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Up to 30 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember
Up to 30 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Up to 30 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Up to 30 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
30 - 90 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember
30 - 90 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
30 - 90 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
30 - 90 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Greater than 90 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 30,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember | 30,000,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember
Greater than 90 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 6,909,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 6,914,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Greater than 90 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 23,091,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 23,086,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Greater than 90 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | $ 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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