v3.25.2
Investments Available-for-Sale Securities in a Loss Position (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value $ 362,010   $ 362,010   $ 1,053,882
Less than 12 months, gross unrealized holding losses 1,992   1,992   13,406
12 Months or Longer, Estimated Fair Value 796,263   796,263   938,410
12 Months or Longer, Gross Unrealized Holding Losses 105,150   105,150   123,636
Total Estimated Fair Value 1,158,273   1,158,273   1,992,292
Total Gross Unrealized Holding Losses 107,142   107,142   137,042
Beginning balance 47 $ 543 27 $ 553  
Increase to allowance from securities for which credit losses were not previously recorded 0 0 0 0  
Reduction from securities sold during the period (2) (479) (14) (479)  
Net increase (decrease) from securities that had an allowance at the beginning of the period (3) 3 29 (7)  
Ending balance 42 $ 67 $ 42 $ 67  
Debt Securities Available For Sale Allowance For Credit Loss Number Of Securities | security     3    
U.S. Treasury securities and obligations of U.S. government agencies          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 293   $ 293   838
Less than 12 months, gross unrealized holding losses 3   3   13
12 Months or Longer, Estimated Fair Value 6,746   6,746   14,210
12 Months or Longer, Gross Unrealized Holding Losses 238   238   404
Total Estimated Fair Value 7,039   7,039   15,048
Total Gross Unrealized Holding Losses 241   241   417
Beginning balance     0    
Ending balance 0   0    
Obligations of states, municipalities and political subdivisions [Member]          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 7,184   7,184   27,049
Less than 12 months, gross unrealized holding losses 115   115   417
12 Months or Longer, Estimated Fair Value 117,383   117,383   114,620
12 Months or Longer, Gross Unrealized Holding Losses 21,455   21,455   22,216
Total Estimated Fair Value 124,567   124,567   141,669
Total Gross Unrealized Holding Losses 21,570   21,570   22,633
Beginning balance     3    
Ending balance 3   3    
Corporate and other securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 155,805   155,805   667,645
Less than 12 months, gross unrealized holding losses 1,145   1,145   9,139
12 Months or Longer, Estimated Fair Value 376,847   376,847   493,598
12 Months or Longer, Gross Unrealized Holding Losses 34,673   34,673   44,499
Total Estimated Fair Value 532,652   532,652   1,161,243
Total Gross Unrealized Holding Losses 35,818   35,818   53,638
Beginning balance     23    
Ending balance 39   39    
Asset-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 97,455   97,455   121,371
Less than 12 months, gross unrealized holding losses 171   171   943
12 Months or Longer, Estimated Fair Value 12,589   12,589   24,656
12 Months or Longer, Gross Unrealized Holding Losses 437   437   579
Total Estimated Fair Value 110,044   110,044   146,027
Total Gross Unrealized Holding Losses 608   608   1,522
Beginning balance     0    
Ending balance 0   0    
Residential mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 48,856   48,856   144,955
Less than 12 months, gross unrealized holding losses 358   358   1,934
12 Months or Longer, Estimated Fair Value 231,602   231,602   237,514
12 Months or Longer, Gross Unrealized Holding Losses 45,532   45,532   52,060
Total Estimated Fair Value 280,458   280,458   382,469
Total Gross Unrealized Holding Losses 45,890   45,890   53,994
Beginning balance     0    
Ending balance 0   0    
Commercial mortgage-backed securities          
Debt Securities, Available-for-sale [Line Items]          
Less than 12 Months, Estimated Fair Value 52,417   52,417   92,024
Less than 12 months, gross unrealized holding losses 200   200   960
12 Months or Longer, Estimated Fair Value 51,096   51,096   53,812
12 Months or Longer, Gross Unrealized Holding Losses 2,815   2,815   3,878
Total Estimated Fair Value 103,513   103,513   145,836
Total Gross Unrealized Holding Losses 3,015   3,015   $ 4,838
Beginning balance     1    
Ending balance $ 0   $ 0