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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
	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	2,698us-gaap_InvestmentIncomeAmortizationOfDiscount	1,586us-gaap_InvestmentIncomeAmortizationOfDiscount
Net (premium amortization) discount accretion	$ (17,308)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium	$ (13,810)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium

X

- 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

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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

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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

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