Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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

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).

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-SubTopic 10
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Amount, before tax, of unrealized loss 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).

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Amortized cost of 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
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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