v3.26.3
Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Total $ 1,631,118 $ 1,602,721
Gross Unrealized Gains 266 8,546
Gross Unrealized Losses 171,761 107,909
Estimated Fair Value 1,459,623 1,503,358
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Total 183,806 189,276
Gross Unrealized Gains 12 538
Gross Unrealized Losses 21,818 10,090
Estimated Fair Value 162,000 179,724
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Total 1,421,050 1,387,057
Gross Unrealized Gains 32 7,836
Gross Unrealized Losses 149,066 97,104
Estimated Fair Value 1,272,016 1,297,789
Private label    
Debt Securities, Available-for-sale [Line Items]    
Total 5,052 5,068
Gross Unrealized Gains 0 0
Gross Unrealized Losses 92 36
Estimated Fair Value 4,960 5,032
Trust preferred securities    
Debt Securities, Available-for-sale [Line Items]    
Total 4,619 4,612
Gross Unrealized Gains 0 0
Gross Unrealized Losses 91 188
Estimated Fair Value 4,528 4,424
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Total 16,591 16,708
Gross Unrealized Gains 222 172
Gross Unrealized Losses 694 491
Estimated Fair Value $ 16,119 $ 16,389