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Credit Facilities (Narrative) (Details) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 26, 2016 USD ($) | Jun. 22, 2012 USD ($) | Mar. 31, 2021 GBP (£) Item Rate | Dec. 31, 2019 | Mar. 31, 2021 USD ($) Item Rate | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 USD ($) | Mar. 25, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  | £ 52,175,000 |  | $ 1,050,000,000 |  |  |
Maximum percentage of admitted assets allowed for borrowing base |  |  | 10.00% |  | 10.00% |  |  |
Advances from FHLB |  |  |  |  | $ 310,000,000 |  | $ 310,000,000 |
Wells Fargo Bank Group Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, term of credit facility | 5 years | 4 years |  |  |  |  |  |
Line of credit facility, commitment | $ 800,000,000 | $ 800,000,000 |  |  | $ 800,000,000 |  | 800,000,000 |
Line of credit facility, number of tranches | Item |  |  | 2 |  | 2 |  |  |
Line of credit facility, required debt-to-capital ratio | Rate |  |  | 35.00% |  | 35.00% |  |  |
Line of credit facility, required minimum net worth |  |  |  |  | $ 5,370,979,000 |  |  |
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |  |
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |  |
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants |  |  |  |  | 6,476,618,000 |  |  |
Revolving credit borrowings |  |  |  |  | 749,766,000 |  | 753,932,000 |
Wells Fargo Bank Group Credit Facility Tranche One [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  | 200,000,000 |  |  |
Revolving credit borrowings |  |  |  |  |  |  |  | $ 50,000,000
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, spread on variable rate basis |  |  | 0.50% |  |  |  |  |
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, spread on variable rate basis |  |  | 1.00% |  |  |  |  |
Wells Fargo Bank Group Credit Facility Tranche Two [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  | 600,000,000 |  | 600,000,000 |
Wells Fargo Bank Bilateral LOC Agreement [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  | Dec. 31, 2021 |  |  |  |  |
Line of credit facility, commitment |  |  |  |  | 50,000,000 |  |  |
Revolving credit borrowings |  |  |  |  | 42,893,000 |  |  |
Citibank Bilateral Agreement [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  | 200,000,000 |  | 200,000,000 |
Percentage of interest on the principal amount of letters of credit issued |  |  | 0.35% |  |  |  |  |
Percentage of interest on the principal amount of issued extended tenor letters of credit |  |  | 0.45% |  |  |  |  |
Maximum term allowed to execute issued letters of credit |  |  | 60 months |  |  |  |  |
Per annum commitment fee on undrawn credit |  |  | 0.15% |  |  |  |  |
Revolving credit borrowings |  |  |  |  | $ 186,277,000 |  | $ 185,483,000 |
Citibank Bilateral Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, term of credit facility |  |  | 15 months |  |  |  |  |
Lloyds Bank plc Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, commitment | £ |  |  | £ 52,175,000 |  |  | £ 52,175,000 |  |
Line of credit facility, required debt-to-capital ratio | Rate |  |  | 35.00% |  | 35.00% |  |  |
Line of credit facility, required minimum net worth |  |  |  |  | $ 6,393,047,000 |  |  |
Consolidated net worth, percentage |  |  |  | 70.00% |  |  |  |
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |  |
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |  |
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants |  |  |  |  | 6,613,571,000 |  |  |
Percentage commitment fee per annum |  |  | 0.10% |  |  |  |  |
Per annum commitment fee on undrawn credit |  |  | 0.35% |  |  |  |  |
Revolving credit borrowings | £ |  |  | £ 52,175,000 |  |  | £ 52,175,000 |  |
Federal Home Loan Bank Of New York [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Admitted assets for FHLB |  |  |  |  | 17,280,068,000 |  |  |
Maximum amount available under FHLB |  |  |  |  | 1,728,007,000 |  |  |
Advances from FHLB |  |  |  |  | 400,000,000 |  |  |
Revolving credit borrowings |  |  |  |  | $ 310,000 |  |  |
FHLB advance interest rate |  |  | 0.35% |  | 0.35% |  |  |
Amount of borrowed funds required to be used to acquire additional membership stock, percentage |  |  | 4.50% |  |  |  |  |
Federal Home Loan Bank Of New York [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
FHLB advance maturity |  |  | Nov. 30, 2021 |  |  |  |  |
Federal Home Loan Bank Of New York [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
FHLB advance maturity |  |  | Dec. 31, 2021 |  |  |  |  |

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- Definition Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants. + References No definition available. + Details
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- Definition Maximum term allowed to execute issued letters of credit. + References No definition available. + Details
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- Definition Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants. + References No definition available. + Details
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- Definition Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants. + References No definition available. + Details
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- Definition Commitment based on the average daily amount of the remainder of (1) the aggregate amount available under the facility and (2) the aggregate amount of drawings outstanding under the facility + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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