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Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Resale Agreements and Repurchase Agreements) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Resale agreements |  |  |  |  |  |
Gross resale agreements | $ 1,210,000,000 |  |  | $ 1,210,000,000 |  | $ 1,110,000,000
Weighted-average yields | 1.72% |  | 2.59% | 2.09% | 2.71% |
Repurchase agreements |  |  |  |  |  |
Gross repurchase agreements | $ 348,063,000 |  |  | $ 348,063,000 |  | $ 450,000,000
Weighted-average rates | 2.70% |  | 4.68% | 3.48% | 4.87% |
Repurchase agreements’ extinguishment costs | $ 0 | $ 8,700,000 | $ 0 | $ 8,740,000 | $ 0 |
Extinguishment of repurchase agreements |  | $ 150,000,000.0 |  |  |  |
Maturity, 2020 | 48,100,000 |  |  | 48,100,000 |  |
Maturity, 2023 | $ 300,000,000.0 |  |  | $ 300,000,000.0 |  |

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- Definition Assets Purchased Under Agreements to Repurchase, Interest Rate + References No definition available. + Details
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- Definition Weighted average yield on the amount to be repaid by the counterparty to the resale agreement. + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase, Maturing, Remainder of Year + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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