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Assets Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets, Resale Agreements |  |
Gross Amounts of Recognized Assets | $ 2,160,038 | $ 1,460,000
Gross Amounts Offset on the Consolidated Balance Sheet | 0 | 0
Assets Purchased under Agreements to Resell Gross Amounts Not Offset [Abstract] |  |
Collateral Received | (2,138,721) | (1,458,700)
Net Amount | 21,317 | 1,300
Liabilities, Repurchase Agreements |  |
Gross Amounts of Recognized Liabilities | 300,000 | 300,000
Gross Amounts Offset on the Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet | 300,000 | 300,000
Assets Sold under Agreements to Repurchase Gross Amounts Not Offset [Abstract] |  |
Collateral Pledged | (300,000) | (300,000)
Net Amount | 0 | 0
Assets purchased under resale agreements (“resale agreements”) | $ 2,160,038 | $ 1,460,000

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- Definition Amount, after the 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 not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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