Investments - Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Held to maturity
Due in one year or less, amortized cost	$ 19,662,000
Due in one year or less, estimated fair value	19,555,000
Due after one year through five years, amortized cost	149,602,000
Due after one year through five years, estimated fair value	144,315,000
Due after five years through ten years, amortized cost	251,554,000
Due after five years through ten years, estimated fair value	237,412,000
Due after ten years, amortized cost	308,088,000
Due after ten years, estimated fair value	261,826,000
Mortgage-backed securities, amortized cost	9,824,000
Mortgage-backed securities, estimated fair value	9,645,000
Total held to maturity, amortized cost	738,730,000	$ 707,102,000
Total held to maturity, estimated fair value	672,753,000	631,569,000
Available for sale
Due in one year or less, amortized cost	42,379,000
Due in one year or less, estimated fair value	42,184,000
Due after one year through five years, amortized cost	142,351,000
Due after one year through five years, estimated fair value	139,220,000
Due after five years through ten years, amortized cost	89,713,000
Due after five years through ten years, estimated fair value	85,949,000
Due after ten years, amortized cost	17,378,000
Due after ten years, estimated fair value	14,938,000
Mortgage-backed securities, amortized cost	355,480,000
Mortgage-backed securities, estimated fair value	343,816,000
Total available for sale, amortized cost	647,301,000	652,565,000
Total available for sale, estimated fair value	$ 626,106,883	$ 617,891,862