Consolidated net worth, percentage

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- References

No definition available.

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- References

No definition available.

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- References

No definition available.

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- References

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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.

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- Definition

Line of credit facilities, number of facilities.

+ References

No definition available.

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- Definition

Line Of Credit Facility, Number Of Tranches

+ References

No definition available.

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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.

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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.

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- Definition

Percentage Of Interest On The Principal Amount Of Issued Extended Tenor Letters Of Credit.

+ References

No definition available.

+ Details

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- Definition

Percentage of Interest on the Principal Amount of Letters of Credit Issued

+ 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
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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- Definition

Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).

+ References

No definition available.

+ 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.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ 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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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Credit Facilities (Narrative) (Details)			3 Months Ended	6 Months Ended	12 Months Ended
Credit Facilities (Narrative) (Details)	May 26, 2016 USD ($)	Jun. 22, 2012 USD ($)	Jun. 30, 2021 GBP (£) Item Rate	Jun. 30, 2021 GBP (£) Item Rate	Dec. 31, 2020 GBP (£)	Dec. 31, 2019	Jun. 30, 2021 USD ($) Item Rate	May 05, 2021 USD ($)	Feb. 23, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 25, 2020 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, commitment							$ 1,300,000,000
Maximum percentage of admitted assets allowed for borrowing base			10.00%	10.00%			10.00%
Borrowings from FHLB							$ 310,000,000			$ 310,000,000
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Percentage commitment fee per annum				0.10%
Per annum commitment fee on undrawn credit				0.35%
Active Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities			3	3			3
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					$ 600,000,000			800,000,000
Line of credit facility, number of tranches \| Item			2	2			2
Line of credit facility, required debt-to-capital ratio \| Rate			35.00%	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							6,649,276,000
Revolving credit borrowings							402,284,000			753,932,000
Wells Fargo Bank Group Credit Facility [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 [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 One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021
Line of credit facility, commitment										200,000,000
Revolving credit borrowings										164,242,000	$ 50,000,000
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021	Dec. 31, 2021
Line of credit facility, commitment							600,000,000			600,000,000
Revolving credit borrowings							402,284,000			589,690,000
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							500,000,000	$ 500,000,000	$ 50,000,000
Revolving credit borrowings							404,421,000
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility				15 months
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
Revolving credit borrowings							$ 173,553,000			$ 185,483,000
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment \| £			£ 52,175,000	£ 52,175,000	£ 52,175,000
Line of credit facility, required debt-to-capital ratio \| Rate			35.00%	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							6,786,229,000
Revolving credit borrowings \| £			£ 52,175,000	£ 52,175,000	£ 52,175,000
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Admitted assets for FHLB							18,197,177,000
Maximum amount available under FHLB							1,819,717,000
Borrowings from FHLB							400,000,000
Revolving credit borrowings							$ 310,000
FHLB advance interest rate			0.35%	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