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Disclosures About Offsetting Assets and Liabilities (Financial Liabilities and Derivative Liabilities that are Subject to Offset) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Offsetting [Abstract] |  |
Gross amounts of recognized liabilities, Securities lending | $ (231,700) | $ (145,124)
Net amounts presented in the Statement of Financial Condition, Securities lending | (231,700) | (145,124)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending | 51,786 | 46,183
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending | 178,055 | 98,925
Securities lending, Net amount | (1,859) | (16)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell | (208,228) | (190,955)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell | (208,228) | (190,955)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell | 22,733 | 17,992
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell | 185,495 | 172,963
Gross amounts of recognized liabilities | (439,928) | (336,079)
Net amounts presented in the Statement of Financial Condition | (439,928) | (336,079)
Gross amounts not offset in the Statement of Financial Position, Financial instruments | 74,519 | 64,175
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged | 363,550 | 271,888
Net amount | $ (1,859) | $ (16)

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- Definition Securities loaned amount not offset against collateral. + References No definition available. + Details
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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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