v3.26.1
Fair Value Measurements - Schedule of Assets Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale $ 1,434,375 $ 1,404,774
Equity securities:    
Bank loan participations 153,336 155,138
Short-term investments 597 0
Fixed Maturity Securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 1,434,375 1,404,774
State and municipal    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 224,455 219,477
Residential mortgage-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 466,820 472,718
Corporate    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 606,439 577,754
Commercial mortgage and asset-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 121,745 120,535
U.S. Treasury securities and obligations guaranteed by the U.S. government    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 14,916 14,290
Recurring basis    
Equity securities:    
Bank loan participations 153,336 155,138
Short-term investments 597 0
Recurring basis | Fixed Maturity Securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 1,434,375 1,404,774
Recurring basis | State and municipal    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 224,455 219,477
Recurring basis | Residential mortgage-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 466,820 472,718
Recurring basis | Corporate    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 606,439 577,754
Recurring basis | Commercial mortgage and asset-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 121,745 120,535
Recurring basis | U.S. Treasury securities and obligations guaranteed by the U.S. government    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 14,916 14,290
Recurring basis | Equity securities    
Equity securities:    
Total equity securities 72,317 73,092
Recurring basis | Preferred stock    
Equity securities:    
Total equity securities 69,795 70,601
Recurring basis | Common stock    
Equity securities:    
Total equity securities 2,522 2,491
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1    
Equity securities:    
Bank loan participations 0 0
Short-term investments 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Fixed Maturity Securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 14,916 14,290
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | State and municipal    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Residential mortgage-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Corporate    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Commercial mortgage and asset-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | U.S. Treasury securities and obligations guaranteed by the U.S. government    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 14,916 14,290
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Equity securities    
Equity securities:    
Total equity securities 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Preferred stock    
Equity securities:    
Total equity securities 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets Level 1 | Common stock    
Equity securities:    
Total equity securities 0 0
Recurring basis | Significant Other Observable Inputs Level 2    
Equity securities:    
Bank loan participations 153,336 155,138
Short-term investments 597 0
Recurring basis | Significant Other Observable Inputs Level 2 | Fixed Maturity Securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 1,419,459 1,390,484
Recurring basis | Significant Other Observable Inputs Level 2 | State and municipal    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 224,455 219,477
Recurring basis | Significant Other Observable Inputs Level 2 | Residential mortgage-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 466,820 472,718
Recurring basis | Significant Other Observable Inputs Level 2 | Corporate    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 606,439 577,754
Recurring basis | Significant Other Observable Inputs Level 2 | Commercial mortgage and asset-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 121,745 120,535
Recurring basis | Significant Other Observable Inputs Level 2 | U.S. Treasury securities and obligations guaranteed by the U.S. government    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Other Observable Inputs Level 2 | Equity securities    
Equity securities:    
Total equity securities 72,308 73,088
Recurring basis | Significant Other Observable Inputs Level 2 | Preferred stock    
Equity securities:    
Total equity securities 69,795 70,601
Recurring basis | Significant Other Observable Inputs Level 2 | Common stock    
Equity securities:    
Total equity securities 2,513 2,487
Recurring basis | Significant Unobservable Inputs Level 3    
Equity securities:    
Bank loan participations 0 0
Short-term investments 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Fixed Maturity Securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | State and municipal    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Residential mortgage-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Corporate    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Commercial mortgage and asset-backed    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | U.S. Treasury securities and obligations guaranteed by the U.S. government    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Equity securities    
Equity securities:    
Total equity securities 9 4
Recurring basis | Significant Unobservable Inputs Level 3 | Preferred stock    
Equity securities:    
Total equity securities 0 0
Recurring basis | Significant Unobservable Inputs Level 3 | Common stock    
Equity securities:    
Total equity securities $ 9 $ 4