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Investments (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Investment Holdings [Line Items]

Gross unrealized gains and losses and the cost and fair value of investments classified as held-to-maturity

		Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(In thousands)
States and political subdivisions		$	400,687			$	31,387			$	(106	)		$	431,968
Corporate bonds			82,824				1,565				(12	)			84,377
Commercial mortgage-backed securities			51,529				6,433				—				57,962
U.S. agency-based mortgage-backed securities			32,984				3,063				(5	)			36,042
U.S. Treasury securities and obligations of U.S. Government agencies			11,034				1,721				—				12,755
Asset-backed securities			4,229				192				(176	)			4,245
Totals		$	583,287			$	44,361			$	(299	)		$	627,349

		Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(In thousands)
States and political subdivisions		$	441,273			$	29,026			$	(360	)		$	469,939
Corporate bonds			92,682				1,539				(130	)			94,091
Commercial mortgage-backed securities			51,550				4,195				—				55,745
U.S. agency-based mortgage-backed securities			46,096				4,162				(44	)			50,214
U.S. Treasury securities and obligations of U.S. Government agencies			9,141				1,634				—				10,775
Asset-backed securities			5,306				17				(845	)			4,478
Totals		$	646,048			$	40,573			$	(1,379	)		$	685,242

Gross unrealized gains and losses and the cost and fair value of investments classified as available-for-sale

		Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(In thousands)
Fixed Maturity:
States and political subdivisions		$	93,362			$	5,022			$	(142	)		$	98,242
Corporate bonds			39,211				623				(24	)			39,810
U.S. agency-based mortgage-backed securities			11,941				5				(859	)			11,087
Total Fixed Maturity			144,514				5,650				(1,025	)			149,139
Equity securities			7,000				451				(685	)			6,766
Totals		$	151,514			$	6,101			$	(1,710	)		$	155,905

		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(In thousands)
Fixed Maturity:
States and political subdivisions		$	55,275			$	2,488			$	(1	)		$	57,762
Corporate bonds			42,802				411				(233	)			42,980
Total Fixed Maturity			98,077				2,899				(234	)			100,742
Equity securities			11,776				661				(197	)			12,240
Totals		$	109,853			$	3,560			$	(431	)		$	112,982

A summary of the Company's realized gains and losses on sales, calls or redemptions of investments

		Fixed Maturity Securities Available for Sale				Equity Securities				Other				Total
		(In thousands)
Year ended December 31, 2012
Proceeds from sales		$	22,363			$	10,777			$	—			$	33,140
Gross realized investment gains		$	1,555			$	1,186			$	—			$	2,741
Gross realized investment (losses)			—				—				—				—
Net realized investment gain			1,555				1,186				—				2,741
Other, including gains on calls and redemptions			15				—				223				238
Net realized investment gains		$	1,570			$	1,186			$	223			$	2,979
Year ended December 31, 2011
Proceeds from sales		$	21,560			$	14,769			$	—			$	36,329
Gross realized investment gains		$	815			$	1,621			$	—			$	2,436
Gross realized investment (losses)			—				(98	)			(1	)			(99	)
Net realized investment gain			815				1,523				(1	)			2,337
Impairments			—				—				(169	)			(169	)
Other, including gains on calls and redemptions			—				—				60				60
Net realized investment gains		$	815			$	1,523			$	(110	)		$	2,228
Year ended December 31, 2010
Proceeds from sales		$	15,462			$	14,695			$	—			$	30,157
Gross realized investment gains		$	—			$	2,650			$	—			$	2,650
Gross realized investment (losses)			—				—				—				—
Net realized investment gain			—				2,650				—				2,650
Impairments			—				(693	)			—				(693	)
Other, including gains on calls and redemptions			411				—				81				492
Net realized investment gains		$	411			$	1,957			$	81			$	2,449

Major categories of the Company's net investment income

		Year Ended December 31,
		2012				2011				2010
		(In thousands)
Gross investment income:
Fixed maturity securities		$	27,167			$	26,769			$	26,571
Short-term investments and cash and cash equivalents			489				590				819
Equity securities			446				181				71
Total gross investment income			28,102				27,540				27,461
Investment expenses			(1,084	)			(1,200	)			(1,219	)
Net investment income		$	27,018			$	26,340			$	26,242

Investment securities continuous unrealized loss position

		As of December 31, 2012
		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)
Held-to-Maturity
Fixed maturity securities:
Corporate bonds		$	10,734			$	12			$	—			$	—			$	10,734			$	12
States and political subdivisions			11,913				106				—				—				11,913				106
U.S. agency-based mortgage-backed securities			117				—				68				5				185				5
Asset-backed securities			—				—				2,277				176				2,277				176
Total held-to-maturity securities			22,764				118				2,345				181				25,109				299
Available-for Sale
Fixed maturity securities:
Corporate bonds		$	6,411			$	24			$	—			$	—			$	6,411			$	24
States and political subdivisions			6,281				142				—				—				6,281				142
U.S. agency-based mortgage-backed securities			10,919				859				—				—				10,919				859
Equity Securities			4,186				685				—				—				4,186				685
Total available-for-sale securities			27,797				1,710				—				—				27,797				1,710
Total		$	50,561			$	1,828			$	2,345			$	181			$	52,906			$	2,009

		As of December 31, 2011
		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)
Held-to-Maturity
Fixed maturity securities:
Corporate bonds		$	23,063			$	130			$	—			$	—			$	23,063			$	130
States and political subdivisions			2,291				3				5,718				357				8,009				360
U.S. agency-based mortgage-backed securities			—				—				1,012				44				1,012				44
Asset-backed securities			545				15				3,880				830				4,425				845
Total held-to-maturity securities			25,899				148				10,610				1,231				36,509				1,379
Available-for Sale
Fixed maturity securities:
Corporate bonds		$	14,301			$	233			$	—			$	—			$	14,301			$	233
States and political subdivisions			222				1				—				—				222				1
Equity Securities			2,789				197				—				—				2,789				197
Total available-for-sale securities			17,312				431				—				—				17,312				431
Total		$	43,211			$	579			$	10,610			$	1,231			$	53,821			$	1,810

Total held-to-maturity securities [Member]

Summary of Investment Holdings [Line Items]

Summary of the cost or amortized cost and fair value of investments in fixed maturity securities, by contractual maturity

		Cost or Amortized Cost				Fair Value
		(In thousands)
Maturity:
Due in 2013		$	81,159			$	81,897
In 2014 through 2017			147,800				156,272
In 2018 through 2022			138,680				154,343
After 2022			126,906				136,588
U.S. agency-based mortgage-backed securities			32,984				36,042
Commercial mortgage-backed securities			51,529				57,962
Asset-backed securities			4,229				4,245
Totals		$	583,287			$	627,349

Total available-for-sale securities [Member]

Summary of Investment Holdings [Line Items]

Summary of the cost or amortized cost and fair value of investments in fixed maturity securities, by contractual maturity

		Cost or Amortized Cost				Fair Value
		(In thousands)
Maturity:
Due in 2013		$	7,239			$	7,223
In 2014 through 2017			24,641				25,003
In 2018 through 2022			18,708				19,342
After 2021			81,985				86,484
U.S. agency-based mortgage-backed securities			11,941				11,087
Totals		$	144,514			$	149,139

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