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Securities Securities - Premium Amortization and Discount Accretion Included in Income on Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract] |  |
Premium amortization | $ (20,006)us-gaap_InvestmentIncomeAmortizationOfPremium | $ (15,396)us-gaap_InvestmentIncomeAmortizationOfPremium
Discount accretion | 2,698 us-gaap_InvestmentIncomeAmortizationOfDiscount | 1,586 us-gaap_InvestmentIncomeAmortizationOfDiscount
Net (premium amortization) discount accretion | $ (17,308)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium | $ (13,810)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium

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- Definition Amount of accretion of purchase discount on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of amortization of purchase premium on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of accretion (amortization) of purchase discount (premium) on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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