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Borrowings (Repurchase Agreements) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 419,254 | $ 795,354
Securities Sold under Agreements to Repurchase [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 282,500 | $ 652,229
Weighted Average Coupon | 1.56% |
Securities Sold under Agreements to Repurchase [Member] | Due Date: 04 29 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 172,500 |
Weighted Average Coupon | 1.42% |
Settlement Date | Dec. 10, 2012 |
Investment Repurchase Agreement, Repurchase Date | Apr. 29, 2018 |
Securities Sold under Agreements to Repurchase [Member] | Due date: 09 03 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 50,000 |
Weighted Average Coupon | 1.72% |
Settlement Date | Mar. 02, 2017 |
Investment Repurchase Agreement, Repurchase Date | Sep. 03, 2019 |
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/2/2020 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 60,000 |
Weighted Average Coupon | 1.85% |
Settlement Date | Mar. 02, 2017 |
Investment Repurchase Agreement, Repurchase Date | Mar. 02, 2020 |

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- Definition Date the repurchase agreement was made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Footnote 2 + Details
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- Definition Date the repurchase will be made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Footnote 2 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + 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 210.9-03.13,16) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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