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Borrowings (Repurchase Agreements) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 488,043 | $ 328,748
Securities Sold under Agreements to Repurchase [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 377,808 | $ 192,500
Weighted Average Coupon | 2.31% |
Securities Sold under Agreements to Repurchase [Member] | Due Date: 10 02 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 39,989 |
Weighted Average Coupon | 2.30% |
Settlement Date | Sep. 18, 2018 |
Investment Repurchase Agreement, Repurchase Date | Oct. 02, 2018 |
Securities Sold under Agreements to Repurchase [Member] | Due date: 10 10 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 32,525 |
Weighted Average Coupon | 2.19% |
Settlement Date | Sep. 10, 2018 |
Investment Repurchase Agreement, Repurchase Date | Oct. 10, 2018 |
Securities Sold under Agreements to Repurchase [Member] | Due date 10 15 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 12,000 |
Weighted Average Coupon | 2.40% |
Settlement Date | Sep. 25, 2018 |
Investment Repurchase Agreement, Repurchase Date | Oct. 15, 2018 |
Securities Sold under Agreements to Repurchase [Member] | Due date 10 25 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 53,294 |
Weighted Average Coupon | 2.45% |
Settlement Date | Sep. 24, 2018 |
Investment Repurchase Agreement, Repurchase Date | Oct. 25, 2018 |
Securities Sold under Agreements to Repurchase [Member] | Due date 07 06 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 50,000 |
Weighted Average Coupon | 2.86% |
Settlement Date | Jul. 06, 2018 |
Investment Repurchase Agreement, Repurchase Date | Jul. 06, 2020 |
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 |
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/15/2020 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 50,000 |
Weighted Average Coupon | 2.61% |
Settlement Date | Mar. 15, 2018 |
Investment Repurchase Agreement, Repurchase Date | Mar. 15, 2020 |
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/23/2020 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing Balance | $ 30,000 |
Weighted Average Coupon | 2.70% |
Settlement Date | Mar. 23, 2018 |
Investment Repurchase Agreement, Repurchase Date | Mar. 23, 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 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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