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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowings | $ 552,266 | $ 328,748
Securities Sold under Agreements to Repurchase [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 387,379 | 192,500
Fair Value of Underlying Collateral | 412,677 | 205,483
Securities Sold under Agreements to Repurchase [Member] | KGS Alpha [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 12,460 | 0
Fair Value of Underlying Collateral | 13,855 | 0
Securities Sold under Agreements to Repurchase [Member] | JP Morgan Chase Bank [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 80,000 | 82,500
Fair Value of Underlying Collateral | 86,252 | 88,974
Securities Sold under Agreements to Repurchase [Member] | FHLB [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 110,000 | 110,000
Fair Value of Underlying Collateral | 116,330 | 116,509
Securities Sold under Agreements to Repurchase [Member] | Amherst Pierpont [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 46,427 | 0
Fair Value of Underlying Collateral | 48,966 | 0
Securities Sold under Agreements to Repurchase [Member] | Nomura [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 60,000 | 0
Fair Value of Underlying Collateral | 63,464 | 0
Securities Sold under Agreements to Repurchase [Member] | Citigroup [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 49,970 | 0
Fair Value of Underlying Collateral | 53,249 | 0
Securities Sold under Agreements to Repurchase [Member] | JVB Financial [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings | 28,522 | 0
Fair Value of Underlying Collateral | $ 30,561 | $ 0

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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