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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 | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | $ 1,117,199 | $ 963,317
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 | 1,117,199 | 963,317
Securities Sold under Agreements to Repurchase, Gross | 1,117,199 | 963,317
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 | 0
US Treasury [Member] |  |
Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] |  |
Remaining contractual maturity of the agreements overnight and continuous | 1,036,891 | 841,475
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 | 1,036,891 | 841,475
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 | 80,308 | 121,842
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 | $ 80,308 | $ 121,842

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- Definition Remaining contractual maturity of the agreements 30 to 90 Days + References No definition available. + Details
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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 -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 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=82849420&loc=SL20226016-175313 + 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=82849420&loc=SL20226000-175313 Reference 2: 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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