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Borrowings under Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | [1] | $ 1,133,841 | $ 1,222,719
Debt, Weighted Average Interest Rate |  | 0.66% | 0.54%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 42 days | 37 days
Maturity up to 30 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements |  | $ 537,508 | $ 666,124
Debt, Weighted Average Interest Rate |  | 0.63% | 0.52%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 15 days | 14 days
Maturity 31 to 60 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements |  | $ 268,670 | $ 336,350
Debt, Weighted Average Interest Rate |  | 0.67% | 0.53%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 43 days | 45 days
Maturity 61 to 90 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements |  | $ 292,395 | $ 89,142
Debt, Weighted Average Interest Rate |  | 0.71% | 0.70%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 74 days | 74 days
Maturity 91 to 120 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements |  | $ 0 | $ 131,103
Debt, Weighted Average Interest Rate |  | 0.00% | 0.53%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 0 days | 106 days
Matuirty 151 to 180 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements |  | $ 35,268 | $ 0
Debt, Weighted Average Interest Rate |  | 0.82% | 0.00%
Repurchase Agreement Weighted Average Maturity Of Agreements |  | 167 days | 0 days
[1] | In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.

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- Definition Weighted average maturity (weighted by amount of the agreement) of repurchase agreements (agreements to sell securities and repurchase at a later date) at period end, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition [Line Items] for Repurchase Agreements [Table] + References No definition available. + Details
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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 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: 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 Reference 3: 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 4: 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=51825145&loc=SL20226008-175313 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=49176635&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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