v3.25.2
Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Total $ 1,685,151 $ 1,570,449
Gross Unrealized Gains 4,950 2,417
Gross Unrealized Losses 127,678 151,560
Estimated Fair Value 1,562,423 1,421,306
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Total 181,301 199,131
Gross Unrealized Gains 66 139
Gross Unrealized Losses 15,394 15,519
Estimated Fair Value 165,973 183,751
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Total 1,467,378 1,334,755
Gross Unrealized Gains 4,800 1,993
Gross Unrealized Losses 111,216 134,667
Estimated Fair Value 1,360,962 1,202,081
Private label    
Debt Securities, Available-for-sale [Line Items]    
Total 5,078 5,096
Gross Unrealized Gains 0 0
Gross Unrealized Losses 105 163
Estimated Fair Value 4,973 4,933
Trust preferred securities    
Debt Securities, Available-for-sale [Line Items]    
Total 4,608 4,605
Gross Unrealized Gains 0 141
Gross Unrealized Losses 178 0
Estimated Fair Value 4,430 4,746
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Total 26,786 26,862
Gross Unrealized Gains 84 144
Gross Unrealized Losses 785 1,211
Estimated Fair Value $ 26,085 $ 25,795