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Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets, Resale Agreements |  |
Gross Amounts of Recognized Assets | $ 1,450,000 | $ 1,450,000
Gross Amounts Offset on the Consolidated Balance Sheet | (400,000) | (400,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheet | 1,050,000 | 1,050,000
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Financial Instruments | 0 | 0
Collateral Received | (1,037,413) | (1,045,696)
Net Amount | 12,587 | 4,304
Liabilities, Repurchase Agreements |  |
Gross Amounts of Recognized Liabilities | 450,000 | 450,000
Gross Amounts Offset on the Consolidated Balance Sheet | (400,000) | (400,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet | 50,000 | 50,000
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Financial Instruments | 0 | 0
Collateral Pledged | (50,000) | (50,000)
Net Amount | $ 0 | $ 0

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- Definition Amount, after the 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 purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 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(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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