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Financial Derivatives - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Gain expected to be reclassified from AOCI to earnings over next 12 months | $ 5,700,000 |  | $ 5,700,000 |  |
Gain (loss) from interest rate swaps designated as cash flow hedges reclassified to earnings | 0 | $ 0 | 0 | $ 0 |
Investments held as collateral | 0 |  | 0 |  | $ 0
Financial derivatives in net payable position | 0 |  | 0 |  | 0
Notional amount | 15,988,366,000 |  | 15,988,366,000 |  | 15,447,553,000
Exchange Cleared |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 13,600,000,000 |  | 13,600,000,000 |  | 12,800,000,000
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 16,000,000,000.0 |  | 16,000,000,000.0 |  | 15,400,000,000
Cash |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash held as collateral | 2,600,000 |  | 2,600,000 |  | 1,300,000
Cash posted as collateral | 8,400,000 |  | 8,400,000 |  | 11,200,000
Available-for-Sale Securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash posted as collateral | $ 168,800,000 |  | $ 168,800,000 |  | $ 201,100,000

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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