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Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Resale Agreements) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Resale agreements |  |
Total | $ 1,450,000 | $ 2,100,000
Weighted average interest rates | 2.43% | 1.84%
Maturities in 2018 | $ 450,000 |
Maturities in 2019 | 0 |
Maturities in 2020 | 100,000 |
Maturities in 2021 | 0 |
Maturities in 2022 | 250,000 |
Maturities thereafter | $ 650,000 |

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- Definition Weighted average interest rate on the amount to be repaid by the counterparty to the resale agreement. + References No definition available. + Details
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- Definition Amount of maturities, in year five following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year four following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year one following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year six and thereafter following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year three following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount of maturities, in year two following the date of the latest balance sheet, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References No definition available. + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets 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 50 -Paragraph 3 -Subparagraph (a) -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 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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