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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | $ 1,146,566 | $ 925,774
JP Morgan Chase [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 657,452 | 445,942
Maximum Month-End Balance | 783,528 | 445,942
Average Month-End Balance | 660,741 | 261,261
Deutsche Bank Repurchase Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 137,355 | 0
Maximum Month-End Balance | 137,355 | 0
Average Month-End Balance | 19,582 | 0
Goldman Sachs [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 40,657 | 45,928
Maximum Month-End Balance | 45,928 | 52,524
Average Month-End Balance | 43,505 | 45,665
UBS [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 133,899 | 133,899
Maximum Month-End Balance | 133,899 | 133,899
Average Month-End Balance | 133,899 | 133,899
Deutsche Bank [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 177,203 | 300,005
Maximum Month-End Balance | 300,005 | 300,005
Average Month-End Balance | $ 246,773 | $ 300,005

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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 Maximum month-end amount borrowed under the credit facility during the period. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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