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Securities Securities - (Premium Amortization and Discount Accretion Included in Income on Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract] |  |  |
Premium Amortization | $ (68,070)us-gaap_InvestmentIncomeAmortizationOfPremium | $ (49,112)us-gaap_InvestmentIncomeAmortizationOfPremium | $ (28,364)us-gaap_InvestmentIncomeAmortizationOfPremium
Discount Accretion | 6,802 us-gaap_InvestmentIncomeAmortizationOfDiscount | 7,191 us-gaap_InvestmentIncomeAmortizationOfDiscount | 6,663 us-gaap_InvestmentIncomeAmortizationOfDiscount
Net (Premium Amortization) Discount Accretion | $ (61,268)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium | $ (41,921)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium | $ (21,701)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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