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Borrowings under Repurchase Agreements Borrowings under Repurchase Agreements Schedule of Repurchase Agreement by Counterparty (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Repurchase Agreement Counterparty [Line Items] |  |
Repurchase Agreement Counterparty Concentration Risk Threshold | 10.00% |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 49 days | 43 days
Net Accrued Interest | $ 100 |
Wells Fargo Bank, N.A. [Member] |  |
Repurchase Agreement Counterparty [Line Items] |  |
Repurchase Agreement Counterparty, Amount at Risk | $ 17,085 |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 64 days |
Repurchase Agreement Counterparty, Amount at Risk as a Percentage of Shareholders' Equity | 10.00% |

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- Definition Repurchase Agreement Counterparty, Amount at Risk as a Percentage of Shareholders' Equity + References No definition available. + Details
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- Definition Repurchase Agreement Counterparty Concentration Risk Threshold + References No definition available. + Details
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- Definition The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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