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Long Term Subordinated Notes (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Item | Feb. 15, 2021
Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
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% |
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 |
Outstanding debt reduction | $ 13,183 |
Gain on repurchase and retirement of debt | $ 2,536 |
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Reset quarterly interest rate |  | 2.60%
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% |
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% |
Debt instrument, maturity date | Jun. 01, 2044 |

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