Investments - Schedule of Available-for-Sale Investments by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cost or Amortized Cost
One year or less	$ 34,093
After one year through five years	418,689
After five years through ten years	235,889
After ten years	152,498
Residential mortgage-backed	483,074
Commercial mortgage and asset-backed	124,507
Cost or Amortized Cost	1,448,750
Fair Value
One year or less	33,910
After one year through five years	413,159
After five years through ten years	228,537
After ten years	135,915
Residential mortgage-backed	472,718
Commercial mortgage and asset-backed	120,535
Total, Fair Value	$ 1,404,774	$ 1,189,733