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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,463,777 | $ 1,384,607
Gross Unrealized Gains | 4,297 | 28,961
Gross Unrealized Losses | 58,561 | 5,403
Estimated Fair Value | 1,409,513 | 1,408,165
Certificates of deposit, at carrying value | 1,000 | 1,000
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 264,592 | 263,809
Gross Unrealized Gains | 1,904 | 8,622
Gross Unrealized Losses | 11,489 | 215
Estimated Fair Value | 255,007 | 272,216
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,158,996 | 1,080,381
Gross Unrealized Gains | 2,092 | 18,739
Gross Unrealized Losses | 45,995 | 4,809
Estimated Fair Value | 1,115,093 | 1,094,311
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 8,368 | 8,555
Gross Unrealized Gains | 95 | 553
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 8,463 | 9,108
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,574 | 4,570
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 274 | 367
Estimated Fair Value | 4,300 | 4,203
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 27,247 | 27,292
Gross Unrealized Gains | 206 | 1,047
Gross Unrealized Losses | 803 | 12
Estimated Fair Value | $ 26,650 | $ 28,327

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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