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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,389,318 | $ 1,128,163
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 26,368 | 49,336
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 7,521 | 702
Debt Securities, Available-for-sale | 1,408,165 | 1,176,797
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 263,809 | 266,483
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 8,622 | 11,467
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 215 | 139
Debt Securities, Available-for-sale | 272,216 | 277,811
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,085,092 | 815,682
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 16,146 | 34,807
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 6,927 | 105
Debt Securities, Available-for-sale | 1,094,311 | 850,384
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 8,555 | 9,976
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 553 | 916
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Debt Securities, Available-for-sale | 9,108 | 10,892
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,570 | 4,557
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 367 | 457
Debt Securities, Available-for-sale | 4,203 | 4,100
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 27,292 | 31,465
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 1,047 | 2,146
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 12 | 1
Debt Securities, Available-for-sale | $ 28,327 | $ 33,610

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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