Long Term Subordinated Notes (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) Item	Feb. 14, 2023
Subordinated Debt [Member]
Debt Instrument [Line Items]
Outstanding debt reduction	$ 6.0
Subordinated Debt [Member] \| 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%
Interest payment commencement date	Nov. 15, 2007
Basis spread on variable rate	2.385%
Right to defer interest, number of occasions \| Item	1
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Redemption date	May 01, 2047
Percentage of principal amount required for redemption	100.00%
Debt instrument, maturity date	May 01, 2067
Gain on repurchase and retirement of debt	$ 1.0
Subordinated Debt [Member] \| 6.6 % Long Term Subordinated Notes [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Reset quarterly interest rate		6.99%
Subordinated Debt [Member] \| 6.6 % Long Term Subordinated Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Subordinated Debt [Member] \| 6.6 % Long Term Subordinated Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
Senior Notes [Member] \| 4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 01, 2044
Senior Notes [Member] \| 3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.50%
Debt instrument, maturity date	Oct. 15, 2050
Senior Notes [Member] \| 3.125% Senior Notes due 10/15/2052 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.125%
Debt instrument, maturity date	Oct. 15, 2052

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- Definition

Debt Instrument Periodic Payment Interest Right Of Deferment Number Of Years

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- Definition

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

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Date the debt agreement requires the first payment to be made, in YYYY-MM-DD format.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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