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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,572,696 | $ 1,673,864
Gross Unrealized Gains | 6 | 645
Gross Unrealized Losses | 214,483 | 168,989
Estimated Fair Value | 1,358,219 | 1,505,520
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 230,270 | 292,293
Gross Unrealized Gains | 3 | 346
Gross Unrealized Losses | 29,825 | 24,324
Estimated Fair Value | 200,448 | 268,315
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,302,747 | 1,342,666
Gross Unrealized Gains | 3 | 299
Gross Unrealized Losses | 181,147 | 140,686
Estimated Fair Value | 1,121,603 | 1,202,279
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 7,035 | 7,695
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 490 | 464
Estimated Fair Value | 6,545 | 7,231
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,597 | 4,590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 290 | 762
Estimated Fair Value | 4,307 | 3,828
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 28,047 | 26,620
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,731 | 2,753
Estimated Fair Value | $ 25,316 | $ 23,867

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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