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Long Term Subordinated Notes (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	May 16, 2021
Debt Instrument [Line Items]
Redemption date	May 01, 2047
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption	100.00%
Outstanding debt reduction	$ 161,441,000
Gain on repurchase and retirement of debt			$ 13,183,000
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
Debt instrument, maturity date	May 01, 2067		May 01, 2067
Outstanding debt reduction		$ 1,700,000
Gain on repurchase and retirement of debt	$ 0	$ 502,000
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate				2.58%
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
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
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		Jun. 01, 2044

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