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Long Term Subordinated Notes (Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Consolidated balance sheet amount | $ 223,724 | $ 223,674
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member] |  |
Debt Instrument [Line Items] |  |
Date Issued | Jun. 05, 2014 |
Original Principal Amount | $ 400,000 |
Maturity Date | Jun. 01, 2044 | Jun. 01, 2044
Market Value | $ 505,284 | $ 528,000
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member] |  |
Debt Instrument [Line Items] |  |
Date Issued | Oct. 07, 2020 |
Original Principal Amount | $ 1,000,000 |
Maturity Date | Oct. 15, 2050 | Oct. 15, 2050
Market Value | $ 1,068,990 | $ 1,138,100
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Date Issued | Apr. 26, 2007 |
Original Principal Amount | $ 400,000 |
Maturity Date | May 01, 2067 | May 01, 2067
Consolidated balance sheet amount | $ 223,724 | $ 223,674
Market Value | $ 214,772 | $ 206,447
Scheduled [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Date | May 15, 2037 |

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