v3.26.1
INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 2,388,595 $ 523,533
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 28,008 2,200
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,400,160 1,587,302
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 226,073 227,996
Debt Securities, Available-for-Sale, Unrealized Loss Position 3,788,755 2,110,835
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (254,081) (230,196)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,402 2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (17) (4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 38,336 47,336
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (4,291) (4,267)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 41,738 49,609
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (4,308) (4,271)
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 10,033 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 95 95
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5 4
Debt Securities, Available-for-Sale, Unrealized Loss Position 10,128 95
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (15) (4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Securities of U.S. government agencies and corporations    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 35,470 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 249 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-Sale, Unrealized Loss Position 35,470 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (249) 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Residential Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 1,181,376 277,394
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 15,690 1,349
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 414,361 536,694
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 67,267 68,418
Debt Securities, Available-for-Sale, Unrealized Loss Position 1,595,737 814,088
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (82,957) (69,767)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Commercial Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 189,148 39,084
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,506 108
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 151,568 166,649
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13,733 13,633
Debt Securities, Available-for-Sale, Unrealized Loss Position 340,716 205,733
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (16,239) (13,741)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 23,459 23,981
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3,468) (3,392)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 23,459 23,981
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (3,468) (3,392)
Collateralized Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 600,352 56,942
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5,748 130
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 263,609 286,606
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 35,807 36,217
Debt Securities, Available-for-Sale, Unrealized Loss Position 863,961 343,548
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (41,555) (36,347)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 5,333 5,589
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (513) (499)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 5,333 5,589
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (513) (499)
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 114,099 71,825
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,566 511
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 453,419 466,766
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 92,109 88,998
Debt Securities, Available-for-Sale, Unrealized Loss Position 567,518 538,591
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (94,675) (89,509)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,402 2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (17) (4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,167 1,217
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (187) (175)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 4,569 3,490
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (204) (179)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 230,177 70,967
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,068 48
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 47,549 54,351
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14,418 13,591
Debt Securities, Available-for-Sale, Unrealized Loss Position 277,726 125,318
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (15,486) (13,639)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 0 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 0 0
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 27,940 7,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 171 54
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 69,559 76,141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,734 7,135
Debt Securities, Available-for-Sale, Unrealized Loss Position 97,499 83,462
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (2,905) (7,189)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 8,377 16,549
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (123) (201)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 8,377 16,549
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss $ (123) $ (201)