Allowance for Expected Credit Losses, Held-to-Maturity Fixed-Maturity Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Held-to-Maturity, Net of Allowance for Expected Credit Losses [Abstract]
Balance at beginning of period	$ 685,402,000	$ 700,335,000	$ 688,439,360	$ 668,105,000
Balance at end of period	683,911,746	696,392,000	683,911,746	696,392,000
Allowance for Expected Credit Losses [Abstract]
Balance at beginning of period	1,324,000	0	$ 0	$ 0
Accounting Standards Update [Extensible Enumeration]			ASU 2016-13 [Member]	ASU 2016-13 [Member]
Current period change for expected credit losses	35,000	0	$ 91,000	$ 0
Balance at end of period	$ 1,358,977	$ 0	1,358,977	0
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Expected Credit Losses [Abstract]
Balance at beginning of period			$ 1,268,000	$ 0