Long Term Subordinated Notes (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) Item
Debt Instrument [Line Items]
Redemption date		May 01, 2047
6.6 % Long Term Subordinated Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Right to defer interest, number of occasions \| Item		1
6.6 % Long Term Subordinated Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years		10 years
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption		100.00%
Outstanding debt reduction		$ 161,441
Subordinated Debt [Member] \| 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%	6.60%
Debt instrument, maturity date		May 01, 2067
Interest payment commencement date		Nov. 15, 2007
Reset quarterly interest rate	2.78%	2.78%
Basis spread on variable rate		2.385%
Outstanding debt reduction	$ 11,483	$ 13,183
Gain on repurchase and retirement of debt	$ 2,034	$ 2,536
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] \| 5.4% Senior notes due 10/15/2014 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.40%	5.40%
Debt instrument, maturity date		Oct. 15, 2014
Senior Notes [Member] \| 4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%	4.868%
Debt instrument, maturity date		Jun. 01, 2044

Debt Instrument, Periodic Payment, Interest, Right Of Deferment, Number

No definition available.

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- Definition

Debt Instrument Periodic Payment Interest Right Of Deferment Number Of Years

+ References

No definition available.

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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

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

+ 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
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

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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

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

+ References

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- Definition

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.

+ References

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- Definition

End date of debt instrument redemption period, in CCYY-MM-DD format.

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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