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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Dec. 31, 2024
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	$ 3,471,682	$ 3,265,246
Equity securities	29,265	26,433
Cash and cash equivalents	600,183	756,227
Separate account assets	2,156,498	2,281,520
Separate account liabilities	2,156,498	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 securities	3,476,632
Equity securities	29,265	26,433
Trading securities	32,376	12,801
Cash and cash equivalents	600,183	756,227
Separate account assets	2,156,498	2,281,520
Assets, fair value disclosure	6,294,954	6,342,227
Separate account liabilities	2,156,498	2,281,520
Liabilities, fair value disclosure	2,156,498	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 securities	2,665
Equity securities	29,265	26,433
Cash and cash equivalents	540,540	756,227
Assets, fair value disclosure	572,470	786,408
Fair Value, Recurring Measurements [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	3,473,967
Trading securities	32,376	12,801
Cash and cash equivalents	59,643
Separate account assets	2,156,498	2,281,520
Assets, fair value disclosure	5,722,484	5,554,243
Separate account liabilities	2,156,498	2,281,520
Liabilities, fair value disclosure	2,156,498	2,281,520
Fair Value, Recurring Measurements [Member] \| Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value disclosure		1,576
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	3,471,682	3,265,246
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	2,665	3,748
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	3,469,017	3,259,922
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities		1,576
Fixed-Maturity Securities [Member] \| 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 securities	8,828	9,742
Fixed-Maturity Securities [Member] \| 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 securities	8,828	9,742
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Foreign Government [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	159,724	169,033
Fixed-Maturity Securities [Member] \| 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 securities	159,724	169,033
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| States and Political Subdivisions [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	125,196	126,932
Fixed-Maturity Securities [Member] \| 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 securities	125,196	126,932
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Corporates [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	2,200,651	1,995,873
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Corporates [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	2,665	3,748
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Corporates [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	2,197,986	1,992,125
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Residential Mortgage-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	645,615	645,865
Fixed-Maturity Securities [Member] \| 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 securities	645,615	645,865
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Commercial Mortgage-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	78,424	85,032
Fixed-Maturity Securities [Member] \| 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 securities	78,424	83,456
Fixed-Maturity Securities [Member] \| 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 securities		1,576
Fixed-Maturity Securities [Member] \| Fair Value, Recurring Measurements [Member] \| Other Asset-backed Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	253,244	232,769
Fixed-Maturity Securities [Member] \| 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 securities	253,244	$ 232,769
Short-Term Investments [Member] \| Fair Value, Recurring Measurements [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	4,950
Short-Term Investments [Member] \| Fair Value, Recurring Measurements [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total available-for-sale securities	$ 4,950