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Financial Derivatives - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Gain expected to be reclassified from AOCI to earnings over next 12 months | $ 800,000 |  | $ 800,000 |  |
Gain (loss) from interest rate swaps designated as cash flow hedges reclassified to earnings | 0 | $ 0 | 0 | $ 0 |
Investments held as collateral | 0 |  | 0 |  | $ (1,100,000)
Cash posted as collateral | 167,060,000 |  | 167,060,000 |  | 47,018,000
Financial derivatives in net payable position | 0 |  | 0 |  | 0
Notional amount | 13,799,053,000 |  | 13,799,053,000 |  | 9,955,745,000
Uncollateralized [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Credit exposure to interest rate swap counterparties | (300,000) |  | (300,000) |  | 1,400,000
Cash [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash held as collateral | (2,700,000) |  | (2,700,000) |  | (700,000)
Cash posted as collateral | 600,000 |  | 600,000 |  | 0
Available-for-sale Securities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash posted as collateral |  |  |  |  | 47,000,000.0
Exchange Cleared [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 10,800,000,000 |  | 10,800,000,000 |  | 8,500,000,000
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 13,800,000,000 |  | $ 13,800,000,000 |  | $ 9,900,000,000

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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=109980867&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=109980867&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=109980867&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=109980867&loc=SL5579245-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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