Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 55,602	$ 65,756	$ 86,602
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,309	1,017	1,012
Net amortization of investments	6,734	8,868	8,177
Change in investment related allowance for credit losses	44	(79)	(27)
Deferred income taxes	(1,136)	1,270	1,657
Net realized gains on investments	(3,440)	(1,695)	(1,132)
Net unrealized (gains) losses on equity securities	8,092	(12,315)	(4,204)
Net realized (gains) losses on disposal of assets	9	(21)	58
Share-based compensation	2,479	2,320	3,296
Changes in operating assets and liabilities:
Premiums receivable, net	13,387	21,660	1,193
Accrued interest receivable	(348)	1,194	456
Deferred policy acquisition costs	(342)	751	1,238
Amounts held by others		71	7,856
Other assets	(2,840)	(1,016)	(1,230)
Reserves for loss and loss adjustment expenses	(49,241)	(15,283)	(12,326)
Unearned premiums	(6,116)	(8,168)	(11,613)
Reinsurance balances	(4,754)	(14,648)	(10,333)
Amounts held for others and policyholder deposits	2,825	(2,628)	2,271
Federal income taxes recoverable	4,961	(6,831)	(2,803)
Accounts payable and other liabilities	969	(2,244)	(6,750)
Net cash provided by operating activities	28,194	37,979	63,398
Investing activities
Purchases of investments held-to-maturity	(32,152)	(43,307)	(96,452)
Purchases of investments available-for-sale	(106,049)	(51,617)	(73,923)
Purchases of equity securities	(11,147)	(8,388)	(11,330)
Purchases of short-term investments	(66,132)	(167,870)	(139,242)
Proceeds from maturities of investments held-to-maturity	85,006	74,253	104,564
Proceeds from sales and maturities of investments available-for-sale	90,675	114,974	110,700
Proceeds from sales of equity securities	8,487
Proceeds from sales and maturities of short-term investments	108,827	154,187	149,975
Purchases of property and equipment	(2,089)	(1,296)	(921)
Proceeds from sales of property and equipment		23
Net cash provided by investing activities	75,426	70,959	43,371
Financing activities
Finance lease purchases	(58)	(44)	(50)
Purchase of treasury stock	(12,388)
Dividends to shareholders	(100,427)	(99,929)	(88,775)
Net cash used in financing activities	(112,873)	(99,973)	(88,825)
Change in cash and cash equivalents	(9,253)	8,965	17,944
Cash and cash equivalents at beginning of year	70,722	61,757	43,813
Cash and cash equivalents at end of year	61,469	70,722	61,757
Supplemental disclosure of cash flow information
Income taxes paid	$ 7,791	$ 18,198	$ 20,562