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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Less Than Twelve Months |  |
Estimated Fair Value | $ 1,000,744 | $ 535,672
Unrealized Loss | 58,078 | 4,966
Estimated Fair Value | 7,547 | 29,918
Twelve Months or Greater |  |
Unrealized Loss | 483 | 437
Estimated Fair Value | 1,008,291 | 565,590
Unrealized Loss | 58,561 | 5,403
Obligations of states and political subdivisions |  |
Less Than Twelve Months |  |
Estimated Fair Value | 166,363 | 13,277
Unrealized Loss | 11,280 | 152
Estimated Fair Value | 3,247 | 2,420
Twelve Months or Greater |  |
Unrealized Loss | 209 | 63
Estimated Fair Value | 169,610 | 15,697
Unrealized Loss | 11,489 | 215
U.S. Government agencies |  |
Less Than Twelve Months |  |
Estimated Fair Value | 819,437 | 521,407
Unrealized Loss | 45,995 | 4,802
Estimated Fair Value | 0 | 23,295
Twelve Months or Greater |  |
Unrealized Loss | 0 | 7
Estimated Fair Value | 819,437 | 544,702
Unrealized Loss | 45,995 | 4,809
Trust preferred securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 4,300 | 4,203
Twelve Months or Greater |  |
Unrealized Loss | 274 | 367
Estimated Fair Value | 4,300 | 4,203
Unrealized Loss | 274 | 367
Corporate securities |  |
Less Than Twelve Months |  |
Estimated Fair Value | 14,944 | 988
Unrealized Loss | 803 | 12
Estimated Fair Value | 0 | 0
Twelve Months or Greater |  |
Unrealized Loss | 0 | 0
Estimated Fair Value | 14,944 | 988
Unrealized Loss | $ 803 | $ 12

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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