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Balance Sheet Offsetting Balance Sheet Offsetting - Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2016 | Dec. 31, 2015
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase, Gross | $ 720,860 | $ 883,947
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 | 0
Remaining contractual maturity of the agreements overnight and continuous | 720,860 | 875,920
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 8,027
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | 720,860 | 883,947
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement | 720,860 | 883,947
US Treasury Securities [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 595,461 | 664,419
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 0
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | 595,461 | 664,419
Residential mortgage-backed securities [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 125,399 | 211,501
Remaining contractual maturity of the agreements up to 30 Days | 0 | 0
Remaining contractual maturity of the agreements 30 to 90 Days | 0 | 8,027
Remaining contractual maturity of the agreements greater than 90 Days | 0 | 0
Remaining contractual maturity of the agreements total | $ 125,399 | $ 219,528

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- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + 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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