Schedule II - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 39,420	$ 31,458
Depreciation	1,759	1,759
Net realized gain on securities	(311)	(1,343)
Net realized gain on other investments	(22)	3
Changes in the estimated fair value of equity security investments	(4,904)	(10,303)
Net earnings from other investments	(2,880)	(2,209)
Provision for deferred income taxes	1,218	2,278
Increase in receivables	(6,904)	(395)
Decrease (increase) in other assets	(3,977)	1,654
(Decrease) increase in accounts payable and accrued liabilities	7,559	583
Net cash provided by (used in) operating activities	34,095	20,916
Investing Activities
Purchases of short-term securities	(16,427)	(98,476)
Purchases of and net earnings from other investments	(1,714)	(2,536)
Proceeds from sales and maturities of fixed maturity securities	9,509	12,530
Proceeds from sales and maturities of short-term investments	14,398	118,364
Proceeds from sales and distributions of other investments	3,083	3,192
Purchases of property	(3,202)	(1,486)
Net cash provided by (used in) investing activities	(14,600)	4,489
Financing Activities
Repurchases of common stock	(6)	(19)
Exercise of stock appreciation rights	1	0
Dividends paid	(31,716)	(18,131)
Net cash provided by (used in) financing activities	(31,721)	(18,150)
Cash and Cash Equivalents, Beginning of Period	25,949
Cash and Cash Equivalents, End of Period	13,723	25,949
Parent Company
Operating Activities
Net income	39,420	31,458
Equity in net earnings of subsidiaries	(39,685)	(30,804)
Depreciation	99	99
Amortization of investments, net	198	139
Share-based compensation expense related to stock appreciation rights	229	264
Net realized gain on securities	495	(37)
Net realized gain on other investments	(22)	0
Changes in the estimated fair value of equity security investments	(265)	(797)
Net earnings from other investments	(90)	(226)
Provision for deferred income taxes	73	269
Increase in receivables	(147)	(460)
(Increase) decrease in income taxes receivable	(1,701)	1,652
Decrease (increase) in other assets	114	(135)
(Decrease) increase in accounts payable and accrued liabilities	(158)	281
Net cash provided by (used in) operating activities	(1,440)	1,703
Investing Activities
Dividends received from subsidiaries	24,043	34,925
Purchases of fixed maturity and equity securities	(691)	(24,503)
Purchases of short-term securities	(7,590)	(39,635)
Purchases of and net earnings from other investments	(97)	0
Proceeds from sales and maturities of fixed maturity securities	6,179	8,200
Proceeds from sales and maturities of short-term investments	6,081	45,279
Proceeds from sales and distributions of other investments	440	904
Proceeds from sales of other assets	22	0
Purchases of property	(97)	(12)
Net cash provided by (used in) investing activities	28,290	25,158
Financing Activities
Repurchases of common stock	(6)	(19)
Exercise of stock appreciation rights	1	0
Capital contribution to subsidiaries	(1,100)	(600)
Dividends paid	(31,716)	(18,131)
Net cash provided by (used in) financing activities	(32,821)	(18,750)
Net (Decrease) Increase in Cash and Cash Equivalents	(5,971)	8,111
Cash and Cash Equivalents, Beginning of Period	9,651	1,540
Cash and Cash Equivalents, End of Period	3,680	9,651
Supplemental Disclosures:
Income tax payments, net	$ 10,113	$ 9,472