Investments (Tables)

3 Months Ended

Mar. 31, 2023

Gross Unrecognized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses, Carrying Amount and Fair Value of Investments Classified as Held-to-Maturity

The amortized cost, allowance for credit losses, carrying amount, gross unrecognized gains and losses, and the fair value of those investments classified as held-to-maturity at March 31, 2023 are summarized as follows:

	Amortized Cost		Allowance for Credit Losses			Carrying Amount		Gross Unrecognized Gains		Gross Unrecognized Losses			Fair Value
	(in thousands)
States and political subdivisions	$	412,038	$	(40	)	$	411,998	$	1,965	$	(14,777	)	$	399,186
Corporate bonds		53,528		(178	)		53,350		2		(3,170	)		50,182
U.S. agency-based mortgage-backed securities		3,606		—			3,606		30		(126	)		3,510
U.S. Treasury securities and obligations    of U.S. government agencies		11,125		—			11,125		25		(276	)		10,874
Asset-backed securities		65		(2	)		63		—		(1	)		62
Totals	$	480,362	$	(220	)	$	480,142	$	2,022	$	(18,350	)	$	463,814

The amortized cost, allowance for credit losses, carrying amount, gross unrecognized gains and losses, and the fair value of those investments classified as held-to-maturity at December 31, 2022 are summarized as follows:

	Amortized Cost		Allowance for Credit Losses			Carrying Amount		Gross Unrecognized Gains		Gross Unrecognized Losses			Fair Value
	(in thousands)
States and political subdivisions	$	415,136	$	(40	)	$	415,096	$	922	$	(20,074	)	$	395,944
Corporate bonds		59,903		(196	)		59,707		1		(3,857	)		55,851
U.S. agency-based mortgage-backed securities		3,696		—			3,696		33		(153	)		3,576
U.S. Treasury securities and obligations    of U.S. government agencies		13,123		—			13,123		25		(442	)		12,706
Asset-backed securities		69		(3	)		66		2		(1	)		67
Totals	$	491,927	$	(239	)	$	491,688	$	983	$	(24,527	)	$	468,144

Gross Unrealized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses and Fair Value of Investments Classified as Available-for-sale

The amortized cost, gross unrealized gains and losses, fair value, and the allowance for credit losses of those investments classified as available-for-sale at March 31, 2023 are summarized as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Allowance for Credit Losses
	(in thousands)
States and political subdivisions	$	159,914	$	904	$	(7,384	)	$	153,434	$	—
Corporate bonds		175,574		1,200		(4,960	)		171,814		—
U.S. agency-based mortgage-backed securities		5,803		—		(468	)		5,335		—
U.S. Treasury securities and obligations    of U.S. government agencies		15,693		22		(1,210	)		14,505		—
Totals	$	356,984	$	2,126	$	(14,022	)	$	345,088	$	—

The amortized cost, gross unrealized gains and losses, fair value, and the allowance for credit losses of those investments classified as available-for-sale at December 31, 2022 are summarized as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Allowance for Credit Losses
	(in thousands)
States and political subdivisions	$	166,019	$	463	$	(9,826	)	$	156,656	$	—
Corporate bonds		150,915		530		(6,657	)		144,788		—
U.S. agency-based mortgage-backed securities		5,984		—		(538	)		5,446		—
U.S. Treasury securities and obligations    of U.S. government agencies		15,675		9		(1,453	)		14,231		—
Totals	$	338,593	$	1,002	$	(18,474	)	$	321,121	$	—

Gross Unrealized Gains and Losses and Cost of Equity

The cost, gross unrealized gains and losses, and the fair value of equity securities at March 31, 2023 are summarized as follows:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Equity securities:
Domestic common stock	$	50,115	$	13,242	$	—	$	63,357
Total equity securities	$	50,115	$	13,242	$	—	$	63,357

The cost, gross unrealized gains and losses, and the fair value of equity securities at December 31, 2022 are summarized as follows:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Equity securities:
Domestic common stock	$	50,185	$	11,873	$	—	$	62,058
Total equity securities	$	50,185	$	11,873	$	—	$	62,058

Investment Securities Continuous Unrealized Loss Position

The following table summarizes the fair value and gross unrealized losses on securities classified as available-for-sale, aggregated by major investment category and length of time that the individual securities have been in a continuous unrealized loss position as of March 31, 2023:

	Less Than 12 Months				12 Months or Greater				Total
	Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses		Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses		Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses
	(in thousands)
March 31, 2023
Available-for-Sale
States and political subdivisions	$	31,492	$	299	$	62,296	$	7,085	$	93,788	$	7,384
Corporate bonds		97,774		2,018		46,059		2,942		143,833		4,960
U.S. agency-based mortgage-backed securities		—		—		5,335		468		5,335		468
U.S. Treasury securities and obligations    of U.S. government agencies		—		—		13,564		1,210		13,564		1,210
Total available-for-sale securities	$	129,266	$	2,317	$	127,254	$	11,705	$	256,520	$	14,022

The following table summarizes the fair value and gross unrealized losses on securities classified as available-for-sale, aggregated by major investment category and length of time that the individual securities have been in a continuous unrealized loss position as of December 31, 2022:

	Less Than 12 Months				12 Months or Greater				Total
	Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses		Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses		Fair Value of Investments with Unrealized Losses		Gross Unrealized Losses
	(in thousands)
December 31, 2022
Available-for-Sale
States and political subdivisions	$	87,522	$	5,319	$	24,980	$	4,507	$	112,502	$	9,826
Corporate bonds		98,590		4,549		30,011		2,108		128,601		6,657
U.S. agency-based mortgage-backed securities		4,732		444		714		94		5,446		538
U.S. Treasury securities and obligations    of U.S. government agencies		5,589		313		7,719		1,140		13,308		1,453
Total available-for-sale securities	$	196,433	$	10,625	$	63,424	$	7,849	$	259,857	$	18,474

Changes in Allowance for Credit Losses by Major Security Type of Investments Classified as Held-to-Maturity

The following table illustrates the changes in the allowance for credit losses by major security type of the investments classified as held-to-maturity for the three months ended March 31, 2023.

	States and Political Subdivisions		Corporate Bonds			U.S. Agency -Based Mortgage- Backed Securities		U.S. Treasury Securities and Obligations of U.S. Government Agencies		Asset-Backed Securities			Totals
	(in thousands)
Balance at December 31, 2022	$	40	$	196		$	—	$	—	$	3		$	239
Provision for credit loss benefit		—		(18	)		—		—		(1	)		(19	)
Balance at March 31, 2023	$	40	$	178		$	—	$	—	$	2		$	220

Schedule of Amortized Cost Held-to-Maturity Securities Aggregated By Credit Quality Indicator

The table below presents the amortized cost of held-to-maturity securities aggregated by credit quality indicator as of March 31, 2023.

	States and Political Subdivisions		Corporate Bonds		U.S. Agency -Based Mortgage- Backed Securities		U.S. Treasury Securities and Obligations of U.S. Government Agencies		Asset-Backed Securities		Totals
	Amortized cost
	(in thousands)
AAA/AA/A ratings	$	409,073	$	26,353	$	3,606	$	11,125	$	56	$	450,213
Baa/BBB ratings		2,965		27,175		—		—		9		30,149
B ratings		—		—		—		—		—		—
Total	$	412,038	$	53,528	$	3,606	$	11,125	$	65	$	480,362

Held-to-Maturity Securities [Member]

Summary of Carrying Amount, Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity

A summary of the carrying amounts and fair value of investments in fixed maturity securities classified as held-to-maturity, by contractual maturity, is as follows:

	March 31, 2023				December 31, 2022
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in thousands)
Maturity:
Within one year	$	41,342	$	41,136	$	41,878	$	41,652
After one year through five years		157,097		152,035		165,216		159,006
After five years through ten years		122,498		116,231		121,739		112,665
After ten years		155,536		150,840		159,093		151,178
U.S. agency-based mortgage-backed securities		3,606		3,510		3,696		3,576
Asset-backed securities		63		62		66		67
Totals	$	480,142	$	463,814	$	491,688	$	468,144

Available-for-Sale Securities [Member]

Summary of Carrying Amount, Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity

A summary of the amortized cost and fair value of investments in fixed maturity securities classified as available-for-sale, by contractual maturity, is as follows:

	March 31, 2023				December 31, 2022
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(in thousands)
Maturity:
Within one year	$	34,379	$	34,006	$	28,290	$	27,814
After one year through five years		84,849		81,150		68,876		65,406
After five years through ten years		103,517		99,831		102,296		95,366
After ten years		128,436		124,766		133,147		127,089
U.S. agency-based mortgage-backed securities		5,803		5,335		5,984		5,446
Totals	$	356,984	$	345,088	$	338,593	$	321,121