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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	$ 3,444,026	$ 3,265,246
Equity securities	27,728	26,433
Cash and cash equivalents	645,811	756,227
Separate account assets	2,122,558	2,281,520
Separate account liabilities	2,122,558	2,281,520	$ 2,209,287
Fair Value, Recurring Measurements [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	3,444,026	3,265,246
Equity securities	27,728	26,433
Trading securities	32,451	12,801
Cash and cash equivalents	645,811	756,227
Separate account assets	2,122,558	2,281,520
Assets, fair value disclosure	6,272,574	6,342,227
Separate account liabilities	2,122,558	2,281,520
Liabilities, fair value disclosure	2,122,558	2,281,520
Fair Value, Recurring Measurements [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	3,676	3,748
Equity securities	27,728	26,433
Cash and cash equivalents	645,811	756,227
Assets, fair value disclosure	677,215	786,408
Fair Value, Recurring Measurements [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	3,427,850	3,259,922
Trading securities	32,451	12,801
Separate account assets	2,122,558	2,281,520
Assets, fair value disclosure	5,582,859	5,554,243
Separate account liabilities	2,122,558	2,281,520
Liabilities, fair value disclosure	2,122,558	2,281,520
Fair Value, Recurring Measurements [Member] \| Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	12,500	1,576
Assets, fair value disclosure	12,500	1,576
Fair Value, Recurring Measurements [Member] \| U.S. Government and Agencies [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	9,719	9,742
Fair Value, Recurring Measurements [Member] \| U.S. Government and Agencies [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	9,719	9,742
Fair Value, Recurring Measurements [Member] \| Foreign Government [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	167,233	169,033
Fair Value, Recurring Measurements [Member] \| Foreign Government [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	167,233	169,033
Fair Value, Recurring Measurements [Member] \| States and Political Subdivisions [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	124,997	126,932
Fair Value, Recurring Measurements [Member] \| States and Political Subdivisions [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	124,997	126,932
Fair Value, Recurring Measurements [Member] \| Corporates [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	2,128,938	1,995,873
Fair Value, Recurring Measurements [Member] \| Corporates [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	3,676	3,748
Fair Value, Recurring Measurements [Member] \| Corporates [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	2,125,262	1,992,125
Fair Value, Recurring Measurements [Member] \| Residential Mortgage-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	644,147	645,865
Fair Value, Recurring Measurements [Member] \| Residential Mortgage-backed Securities [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	644,147	645,865
Fair Value, Recurring Measurements [Member] \| Commercial Mortgage-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	83,590	85,032
Fair Value, Recurring Measurements [Member] \| Commercial Mortgage-backed Securities [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	83,590	83,456
Fair Value, Recurring Measurements [Member] \| Commercial Mortgage-backed Securities [Member] \| Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities		1,576
Fair Value, Recurring Measurements [Member] \| Other Asset-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	285,402	232,769
Fair Value, Recurring Measurements [Member] \| Other Asset-backed Securities [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	272,902	$ 232,769
Fair Value, Recurring Measurements [Member] \| Other Asset-backed Securities [Member] \| Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale fixed-maturity securities	$ 12,500