Investments (Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Recording investment gross of allowance for credit losses	$ 674,882	$ 479,041
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	176,604	199,456
One Year Prior	199,188	78,332
Two Year Prior	80,175	34,739
Three Year Prior	34,570	2,714
Four Year Prior	2,698	2,198
Prior	94,187	100,314
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	587,422	417,753
Commercial mortgage loans | > 1.2X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	169,173	195,535
One Year Prior	192,845	71,280
Two Year Prior	63,229	34,739
Three Year Prior	34,570	2,714
Four Year Prior	2,698	2,198
Prior	85,801	95,444
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	548,316	401,910
Commercial mortgage loans | 1.0X to 1.2X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	4,180	3,921
One Year Prior	3,824	7,052
Two Year Prior	16,946	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	8,386	4,870
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	33,336	15,843
Commercial mortgage loans | Less than 1.0X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	3,251	0
One Year Prior	2,519	0
Two Year Prior	0	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	5,770	0
Agricultural property loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	23,966	32,130
One Year Prior	32,000	12,875
Two Year Prior	12,921	13,337
Three Year Prior	13,305	1,002
Four Year Prior	968	0
Prior	849	904
Revolving Loans	3,451	1,040
Recording investment gross of allowance for credit losses	87,460	61,288
Agricultural property loans | > 1.2X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	23,966	31,130
One Year Prior	31,000	12,875
Two Year Prior	12,921	13,337
Three Year Prior	960	1,002
Four Year Prior	968	0
Prior	849	904
Revolving Loans	3,451	1,040
Recording investment gross of allowance for credit losses	74,115	60,288
Agricultural property loans | 1.0X to 1.2X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	1,000
One Year Prior	1,000	0
Two Year Prior	0	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	1,000	1,000
Agricultural property loans | Less than 1.0X
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Year Prior	0	0
Three Year Prior	12,345	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	12,345	0
0% to 59.99% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	53,511	65,002
One Year Prior	66,481	9,312
Two Year Prior	12,676	19,739
Three Year Prior	29,629	2,367
Four Year Prior	2,351	2,198
Prior	66,105	68,971
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	230,753	167,589
0% to 59.99% | Agricultural property loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	20,197	32,130
One Year Prior	32,000	10,875
Two Year Prior	10,921	992
Three Year Prior	13,305	1,002
Four Year Prior	968	0
Prior	849	904
Revolving Loans	1,724	1,040
Recording investment gross of allowance for credit losses	79,964	46,943
60% to 69.99% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	114,784	115,394
One Year Prior	109,105	62,665
Two Year Prior	61,202	15,000
Three Year Prior	4,941	347
Four Year Prior	347	0
Prior	18,334	20,157
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	308,713	213,563
60% to 69.99% | Agricultural property loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	3,769	0
One Year Prior	0	2,000
Two Year Prior	2,000	12,345
Three Year Prior	0	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	1,727	0
Recording investment gross of allowance for credit losses	7,496	14,345
70% to 79.99% | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	8,309	19,060
One Year Prior	23,602	6,355
Two Year Prior	6,297	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	2,310	6,416
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	40,518	31,831
70% to 79.99% | Agricultural property loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Year Prior	0	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	0	0
80% or greater | Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Year Prior	0	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	7,438	4,770
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	7,438	4,770
80% or greater | Agricultural property loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Year Prior	0	0
Three Year Prior	0	0
Four Year Prior	0	0
Prior	0	0
Revolving Loans	0	0
Recording investment gross of allowance for credit losses	$ 0	$ 0