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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,479,545,000 | $ 1,673,864,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 2,870,000 | 645,000
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 144,278,000 | 168,989,000
Debt Securities, Available-for-sale | 1,338,137,000 | 1,505,520,000
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 228,456,000 | 292,293,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 371,000 | 346,000
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 16,089,000 | 24,324,000
Debt Securities, Available-for-sale | 212,738,000 | 268,315,000
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,211,484,000 | 1,342,666,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 2,362,000 | 299,000
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 125,753,000 | 140,686,000
Debt Securities, Available-for-sale | 1,088,093,000 | 1,202,279,000
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,997,000 | 7,695,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 293,000 | 464,000
Debt Securities, Available-for-sale | 6,704,000 | 7,231,000
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,599,000 | 4,590,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 321,000 | 762,000
Debt Securities, Available-for-sale | 4,278,000 | 3,828,000
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 28,009,000 | 26,620,000
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 137,000 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 1,822,000 | 2,753,000
Debt Securities, Available-for-sale | $ 26,324,000 | $ 23,867,000

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