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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,673,864 | $ 1,384,607
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 645 | 28,961
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 168,989 | 5,403
Debt Securities, Available-for-sale | 1,505,520 | 1,408,165
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 292,293 | 263,809
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 346 | 8,622
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 24,324 | 215
Debt Securities, Available-for-sale | 268,315 | 272,216
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,342,666 | 1,080,381
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 299 | 18,739
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 140,686 | 4,809
Debt Securities, Available-for-sale | 1,202,279 | 1,094,311
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,695 | 8,555
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 553
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 464 | 0
Debt Securities, Available-for-sale | 7,231 | 9,108
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,590 | 4,570
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 762 | 367
Debt Securities, Available-for-sale | 3,828 | 4,203
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 26,620 | 27,292
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 1,047
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 2,753 | 12
Debt Securities, Available-for-sale | $ 23,867 | $ 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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