Fair Values of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Summary of Carrying or Reported Values and Corresponding Fair Values for Financial Instruments

The following table summarizes the carrying or reported values and corresponding fair values for financial instruments:

	December 31,
	2016				2015
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in thousands)
Assets:
Fixed maturity securities—held to maturity	$	562,434	$	568,931	$	645,164	$	662,276
Fixed maturity securities—available for sale		479,097		479,097		380,022		380,022
Equity securities		33		33		31		31
Cash and cash equivalents		58,936		58,936		69,481		69,481
Short-term investments		29,580		29,580		7,718		7,718
Other investments		13,330		13,330		12,217		12,217

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2016 and 2015 are as follows:

	December 31, 2016
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(in thousands)
Financial instruments carried at fair value,      classified as part of:
Securities available for sale—equity:
Domestic common stock	$	33	$	—	$	—	$	33
Securities available for sale—fixed maturity:
States and political subdivisions		—		232,293		—		232,293
Corporate bonds		—		182,515		—		182,515
U.S. agency-based mortgage-backed securities		—		9,342		—		9,342
U.S. Treasury securities and obligations of U.S. government agencies		54,947		—		—		54,947
Total available for sale—fixed maturity		54,947		424,150		—		479,097
Total available for sale	$	54,980	$	424,150	$	—	$	479,130

	December 31, 2015
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(in thousands)
Financial instruments carried at fair value,      classified as part of:
Securities available for sale—equity:
Domestic common stock	$	31	$	—	$	—	$	31
Securities available for sale—fixed maturity:
States and political subdivisions		—		171,419		—		171,419
Corporate bonds		—		201,304		—		201,304
U.S. agency-based mortgage-backed securities		—		7,299		—		7,299
Total available for sale—fixed maturity		—		380,022		—		380,022
Total available for sale	$	31	$	380,022	$	—	$	380,053

Schedule of Assets and Liabilities Measured at Amortized Cost

Assets and liabilities measured at amortized cost as of December 31, 2016 and 2015 are as follows:

	December 31, 2016
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(in thousands)
Securities held-to-maturity—fixed maturity:
States and political subdivisions	$	—	$	399,483	$	—	$	399,483
Corporate bonds		—		144,016		—		144,016
Commercial mortgage-backed securities		—		70		—		70
U.S. agency-based mortgage-backed securities		—		10,915		—		10,915
U.S. Treasury securities		6,779		—		—		6,779
Obligations of U.S. government agencies		—		5,637		—		5,637
Asset-backed securities		—		2,031		—		2,031
Total held-to-maturity	$	6,779	$	562,152	$	—	$	568,931

	December 31, 2015
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
	(in thousands)
Securities held-to-maturity—fixed maturity:
States and political subdivisions	$	—	$	423,754	$	—	$	423,754
Corporate bonds		—		170,573		—		170,573
Commercial mortgage-backed securities		—		37,683		—		37,683
U.S. agency-based mortgage-backed securities		—		14,471		—		14,471
U.S. Treasury securities		7,599		—		—		7,599
Obligations of U.S. government agencies		—		5,781		—		5,781
Asset-backed securities		—		2,415		—		2,415
Total held-to-maturity	$	7,599	$	654,677	$	—	$	662,276