AMERISAFE (AMSF) 10-Q1 Aug 142014 Q2 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
Document and Entity Information	Jun. 30, 2014	Jul. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'AMSF	'
Entity Registrant Name	'AMERISAFE INC	'
Entity Central Index Key	'0001018979	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	18,741,325

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments:	'	'
Fixed maturity securities-held-to-maturity, at amortized cost (fair value $607,512 and $561,179 in 2014 and 2013, respectively)	$579,145	$536,583
Fixed maturity securities-available-for-sale, at fair value (cost $282,240 and $244,409 in 2014 and 2013, respectively)	284,613	237,877
Equity securities-available-for-sale, at fair value (cost $3,446 and $9,482 in 2014 and 2013, respectively)	3,980	9,302
Short-term investments	85,806	84,422
Other investments	11,092	10,591
Total investments	964,636	878,775
Cash and cash equivalents	98,818	123,077
Amounts recoverable from reinsurers	85,512	75,326
Premiums receivable, net of allowance	205,113	171,579
Deferred income taxes	33,542	33,645
Accrued interest receivable	11,234	11,242
Property and equipment, net	7,589	7,549
Deferred policy acquisition costs	21,809	19,171
Other assets	11,464	8,637
Total assets	1,439,717	1,329,001
Liabilities:	'	'
Reserves for loss and loss adjustment expenses	657,276	614,557
Unearned premiums	184,238	164,296
Reinsurance premiums payable	1,000	607
Amounts held for others	39,084	35,739
Policyholder deposits	47,450	44,620
Insurance-related assessments	32,137	25,428
Accounts payable and other liabilities	32,651	26,940
Payable for investments purchased	10,397	'
Total liabilities	1,004,233	912,187
Shareholders' equity:	'	'
Common stock: Voting-$0.01 par value authorized shares-50,000,000 in 2014 and 2013; 19,984,575 and 19,855,430 shares issued and 18,726,325 and 18,597,180 shares outstanding in 2014 and 2013, respectively	199	198
Additional paid-in capital	195,436	192,537
Treasury stock at cost (1,258,250 shares in 2014 and 2013)	-22,370	-22,370
Accumulated earnings	260,258	250,744
Accumulated other comprehensive income/(loss), net	1,961	-4,295
Total shareholders' equity	435,484	416,814
Total liabilities and shareholders' equity	$1,439,717	$1,329,001

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]	'	'
Fixed maturity securities, fair value	$607,512	$561,179
Fixed maturity securities, cost	282,240	244,409
Equity securities, cost	$3,446	$9,482
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	19,984,575	19,855,430
Common stock, shares outstanding	18,726,325	18,597,180
Treasury stock, shares	1,258,250	1,258,250

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	'	'	'	'
Gross premiums written	$103,820	$95,815	$209,523	$194,938
Ceded premiums written	-3,493	-4,576	-6,832	-9,057
Net premiums written	100,327	91,239	202,691	185,881
Net premiums earned	93,516	81,983	182,749	161,692
Net investment income	6,845	6,649	13,553	13,319
Net realized gains/(losses) on investments	232	-1,291	333	-1,267
Fee and other income	31	170	162	279
Total revenues	100,624	87,511	196,797	174,023
Expenses	'	'	'	'
Loss and loss adjustment expenses incurred	62,463	56,813	123,748	112,814
Underwriting and certain other operating costs	8,839	7,770	16,802	14,838
Commissions	6,987	6,229	13,674	12,393
Salaries and benefits	5,186	5,664	11,907	11,309
Policyholder dividends	88	388	201	942
Total expenses	83,563	76,864	166,332	152,296
Income before income taxes	17,061	10,647	30,465	21,727
Income tax expense	4,288	3,003	7,143	5,232
Net income	12,773	7,644	23,322	16,495
Net income available to common shareholders	$12,773	$7,618	$23,322	$16,454
Earnings per share	'	'	'	'
Basic	$0.69	$0.42	$1.26	$0.90
Diluted	$0.68	$0.41	$1.23	$0.88
Shares used in computing earnings per share	'	'	'	'
Basic	18,600,186	18,353,174	18,566,235	18,317,452
Diluted	18,894,885	18,712,299	18,885,384	18,713,776
Extraordinary cash dividends declared per common share	'	'	$0.50	'
Cash dividends declared per common share	$0.12	$0.08	$0.24	$0.16

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$12,773	$7,644	$23,322	$16,495
Other comprehensive income:	'	'	'	'
Unrealized gain/(loss) on securities, net of tax	3,016	-4,060	6,256	-4,605
Comprehensive income	$15,789	$3,584	$29,578	$11,890

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (USD $)	Total	Common stock	Treasury Stock	Additional Paid-In Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
In Thousands, except Share data	Total	Common stock	Treasury Stock	Additional Paid-In Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013	$416,814	$198	($22,370)	$192,537	$250,744	($4,295)
Treasury Stock Beginning Balance, Shares at Dec. 31, 2013	-1,258,250	'	-1,258,250	'	'	'
Beginning Balance, Shares at Dec. 31, 2013	19,855,430	19,855,430	'	'	'	'
Comprehensive income	29,578	'	'	'	23,322	6,256
Options exercised	1,127	1	'	1,126	'	'
Options exercised, Shares	123,167	123,167	'	'	'	'
Tax benefit from share-based payments	1,227	'	'	1,227	'	'
Restricted common stock issued	'	'	'	'	'	'
Restricted common stock issued, Shares	'	5,978	'	'	'	'
Share-based compensation	546	'	'	546	'	'
Dividends to stockholders	-13,808	'	'	'	-13,808	'
Ending Balance at Jun. 30, 2014	$435,484	$199	($22,370)	$195,436	$260,258	$1,961
Treasury Stock Ending Balance, Shares at Jun. 30, 2014	-1,258,250	'	-1,258,250	'	'	'
Ending Balance, Shares at Jun. 30, 2014	19,984,575	19,984,575	'	'	'	'

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Operating Activities	'	'
Net income	$23,322	$16,495
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	627	644
Net amortization of investments	7,389	6,183
Deferred income taxes	-3,266	-1,772
Net realized (gains)/losses on investments	-333	1,267
Loss on sale of asset	'	2
Share-based compensation	423	669
Changes in operating assets and liabilities:	'	'
Premiums receivable, net	-33,534	-38,295
Accrued interest receivable	8	-488
Deferred policy acquisition costs	-2,638	-2,540
Other assets	-3,328	-2,121
Reserves for loss and loss adjustment expenses	42,719	23,020
Unearned premiums	19,942	24,188
Reinsurance balances	-9,793	-1,855
Amounts held for others and policyholder deposits	6,175	7,756
Accounts payable and other liabilities	22,885	26,293
Net cash provided by operating activities	70,598	59,446
Investing Activities	'	'
Purchases of investments held-to-maturity	-92,419	-48,321
Purchases of investments available-for-sale	-67,029	-77,720
Purchases of short-term investments	-69,139	-72,680
Proceeds from maturities of investments held-to-maturity	46,614	62,403
Proceeds from sales and maturities of investments available-for-sale	33,120	11,179
Proceeds from sales and maturities of short-term investments	66,061	58,039
Purchases of property and equipment	-667	-662
Net cash used in investing activities	-83,459	-67,762
Financing Activities	'	'
Proceeds from stock option exercises	1,127	1,125
Tax benefit from share-based payments	1,227	883
Dividends to stockholders	-13,752	-2,944
Net cash used in financing activities	-11,398	-936
Change in cash and cash equivalents	-24,259	-9,252
Cash and cash equivalents at beginning of period	123,077	92,676
Cash and cash equivalents at end of period	$98,818	$83,424

Basis_of_Presentation

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Note 1. Basis of Presentation
	AMERISAFE, Inc. (the “Company”) is an insurance holding company incorporated in the state of Texas. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries: American Interstate Insurance Company (“AIIC”), Silver Oak Casualty, Inc. (“SOCI”), American Interstate Insurance Company of Texas (“AIICTX”), Amerisafe Risk Services, Inc. (“RISK”) and Amerisafe General Agency, Inc. (“AGAI”). AIIC and SOCI are property and casualty insurance companies organized under the laws of the state of Nebraska. AIICTX is a property and casualty insurance company organized under the laws of the state of Texas. In 2013, AIIC and SOCI were re-domesticated to Nebraska from Louisiana. RISK, a wholly owned subsidiary of the Company, is a claims and safety services company, currently servicing only affiliated insurance companies. AGAI, a wholly owned subsidiary of the Company, is a general agent for the Company. AGAI sells insurance, which is underwritten by AIIC, SOCI and AIICTX, as well as by nonaffiliated insurance carriers. The assets and operations of AGAI are not significant to that of the Company and its consolidated subsidiaries. The terms “AMERISAFE,” the “Company,” “we,” “us” or “our” refer to AMERISAFE, Inc. and its consolidated subsidiaries, as the context requires.
	The Company provides workers’ compensation insurance for small to mid-sized employers engaged in hazardous industries, principally construction, trucking, manufacturing, oil and gas, and agriculture. Assets and revenues of AIIC represent at least 95% of comparable consolidated amounts of the Company for each of 2014 and 2013.
	In the opinion of management of the Company, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting of normal recurring accruals) necessary to present fairly the financial position, the results of operations and cash flows for the periods presented. The unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q under the Securities Exchange Act of 1934 and therefore do not include all information and footnotes to be in conformity with accounting principles generally accepted in the United States (“GAAP”). The results for the interim periods are not necessarily indicative of the results of operations that may be expected for the year. The unaudited condensed consolidated financial statements contained herein should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2013.
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Stock_Options_and_Restricted_S

Stock Options and Restricted Stock	6 Months Ended
Stock Options and Restricted Stock	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock Options and Restricted Stock	'
	Note 2. Stock Options and Restricted Stock
	The Company has three equity incentive plans: the AMERISAFE 2005 Equity Incentive Plan (the “2005 Incentive Plan”), the AMERISAFE 2010 Non-Employee Director Restricted Stock Plan (the “2010 Restricted Stock Plan”) and the AMERISAFE 2012 Equity and Incentive Compensation Plan (the “2012 Incentive Plan”). See Note 13 to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2013 for additional information regarding the Company’s incentive plans.
	In June 2014, the Company granted 4,866 shares of restricted common stock to non-employee directors in accordance with the 2010 Restricted Stock Plan. The market value of the restricted shares granted was $0.2 million.
	During the six months ended June 30, 2014, options to purchase 123,167 shares of common stock were exercised. During the six months ended June 30, 2013, options to purchase 125,000 shares of common stock were exercised. In connection with these exercises, the Company received $1.1 million of stock option proceeds in the first six months each of 2014 and 2013.
	The Company recognized share-based compensation expense of $0.4 million and $0.7 million in the six months ended June 30, 2014 and 2013, respectively.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
Earnings Per Share	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 3. Earnings Per Share
	The Company computes earnings per share (“EPS”) in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 260, Earnings Per Share. Additionally, during 2013, the Company applied the “two-class method” in computing basic and diluted earnings per share as a result of the participating unvested common shares which contained nonforfeitable rights to dividends during this period. As of January 1, 2014, the Company no longer has participating unvested common shares which contain nonforfeitable rights to dividends and now applies the treasury stock method in computing basic and diluted earnings per share.

	Under the two-class method, net income available to common and participating common shareholders is reduced by the amount of dividends declared in the current period and by the contractual amount of dividends that must be paid for the current period related to the Company’s common and participating common shares. Participating common shares include unvested share-based payment awards that contain nonforfeitable rights to dividends, whether paid or unpaid. Any remaining undistributed earnings are allocated to the common and participating common shareholders to the extent that each security shares in earnings as if all of the earnings for the period had been distributed. The amount of earnings allocable to each security is divided by the number of outstanding shares of the security to which the earnings are allocated to determine the EPS for the security. In a period of loss, no losses are allocated to the participating common shareholders. Instead, all such losses are allocated to the common shareholders.
	Basic EPS is calculated by dividing income available to common shareholders by the weighted-average number of common shares outstanding during the period. The diluted EPS calculation includes potential common shares assumed issued under the treasury stock method, which reflects the potential dilution that would occur if any outstanding options or warrants were exercised or restricted stock becomes vested, and includes the “if converted” method for participating securities if the effect is dilutive. We determine diluted EPS as the more dilutive result of either the treasury method or the two-class method.

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2014		2013		2014		2013
		(in thousands, except share and per share amounts)
	Basic EPS:
	Net income, as reported	$	12,773	$	7,644	$	23,322	$	16,495
	Less allocated income to unvested shares		—		26		—		41

	Net income available to common shareholders—basic	$	12,773	$	7,618	$	23,322	$	16,454

	Basic weighted average common shares		18,600,186		18,353,174		18,566,235		18,317,452
	Basic earnings per common share	$	0.69	$	0.42	$	1.26	$	0.9
	Diluted EPS:
	Net income available to common shareholders—diluted	$	12,773	$	7,619	$	23,322	$	16,455

	Diluted weighted average common shares:
	Weighted average common shares		18,600,186		18,353,174		18,566,235		18,317,452
	Stock options and performance shares		294,699		359,125		319,149		396,324

	Diluted weighted average common shares		18,894,885		18,712,299		18,885,384		18,713,776

	Diluted earnings per common share	$	0.68	$	0.41	$	1.23	$	0.88

Investments

Investments	6 Months Ended
Investments	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Investments	'
	Note 4. Investments
	The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at June 30, 2014 are summarized as follows:


			Amortized Cost			Gross			Gross				Fair Value
						Unrealized			Unrealized
						Gains			Losses
			(in thousands)
	States and political subdivisions		$	392,381		$	21,821		$	(66	)		$	414,136
	Corporate bonds			102,925			756			(57	)			103,624
	Commercial mortgage-backed securities			49,327			2,767			—				52,094
	U.S. agency-based mortgage-backed securities			19,170			1,892			—				21,062
	U.S. Treasury securities and obligations of U.S. government agencies			12,259			1,132			(1	)			13,390
	Asset-backed securities			3,083			243			(120	)			3,206

	Totals		$	579,145		$	28,611		$	(244	)		$	607,512


	The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at June 30, 2014 are summarized as follows:


			Cost or			Gross			Gross				Fair Value
			Amortized Cost			Unrealized			Unrealized
						Gains			Losses
			(in thousands)
	Fixed maturity:
	States and political subdivisions		$	151,140		$	5,711		$	(1,759	)		$	155,092
	Corporate bonds			121,088			708			(33	)			121,763
	U.S. agency-based mortgage-backed securities			10,012			1			(2,255	)			7,758

	Total fixed maturity			282,240			6,420			(4,047	)			284,613
	Other investments			10,000			1,092			—				11,092
	Equity securities			3,446			540			(6	)			3,980

	Totals		$	295,686		$	8,052		$	(4,053	)		$	299,685

	The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at December 31, 2013 are summarized as follows:


			Amortized Cost			Gross			Gross				Fair Value
						Unrealized			Unrealized
						Gains			Losses
			(in thousands)
	States and political subdivisions		$	381,674		$	18,634		$	(1,153	)		$	399,155
	Corporate bonds			67,423			861			(41	)			68,243
	Commercial mortgage-backed securities			50,813			3,431			—				54,244
	U.S. agency-based mortgage-backed securities			21,775			1,790			—				23,565
	U.S. Treasury securities and obligations of U.S. Government agencies			11,514			1,002			—				12,516
	Asset-backed securities			3,384			216			(144	)			3,456

	Totals		$	536,583		$	25,934		$	(1,338	)		$	561,179

	The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at December 31, 2013 are summarized as follows:


			Cost or			Gross			Gross				Fair Value
			Amortized Cost			Unrealized			Unrealized
						Gains			Losses
			(in thousands)
	Fixed maturity:
	States and political subdivisions		$	154,024		$	1,491		$	(5,140	)		$	150,375
	Corporate bonds			80,344			445			(361	)			80,428
	U.S. agency-based mortgage-backed securities			10,041			—			(2,967	)			7,074

Total fixed maturity			244,409			1,936			(8,468	)			237,877
Other investments			10,000			591			—				10,591
Equity securities			9,482			387			(567	)			9,302

Totals		$	263,891		$	2,914		$	(9,035	)		$	257,770


A summary of the cost and fair value of investments in fixed maturity securities, classified as held-to-maturity at June 30, 2014, by contractual maturity, is as follows:


Remaining Time to Maturity		Amortized			Fair Value
Remaining Time to Maturity		Cost Basis			Fair Value
		(in thousands)
Less than one year		$	55,153		$	55,726
One to five years			186,929			194,771
Five to ten years			140,954			150,762
More than ten years			124,529			129,891
U.S. agency-based mortgage-backed securities			19,170			21,062
Commercial mortgage-backed securities			49,327			52,094
Asset-backed securities			3,083			3,206

Total		$	579,145		$	607,512

A summary of cost and fair value of investments in fixed maturity securities, classified as available-for-sale at June 30, 2014, by contractual maturity, is as follows:


Remaining Time to Maturity		Amortized			Fair Value
Remaining Time to Maturity		Cost Basis			Fair Value
		(in thousands)
Less than one year		$	34,052		$	34,120
One to five years			84,799			85,482
Five to ten years			14,305			14,661
More than ten years			139,072			142,592
U.S. agency-based mortgage-backed securities			10,012			7,758

Total		$	282,240		$	284,613

The following table summarizes the fair value and gross unrealized losses on securities, aggregated by major investment category and length of time that the individual securities have been in a continuous unrealized loss position:


		Less Than 12 Months						12 Months or Greater							Total
		Fair Value of			Gross			Fair Value of				Gross			Fair Value of		Gross
		Investments			Unrealized			Investments				Unrealized			Investments		Unrealized
		with			Losses			with				Losses			with		Losses
		Unrealized						Unrealized							Unrealized
		Losses						Losses							Losses
		(In thousands)
June 30, 2014
Held-to-Maturity
Fixed maturity securities:
Corporate bonds		$	19,268		$	57		$	—			$	—		$	19,268	$	57
States and political subdivisions			14,872			64			1,423				2			16,295		66
Asset-backed securities			—			—			1,799				120			1,799		120
U.S. Treasury securities and obligations of U.S. government agencies			2,852			1			—				—			2,852		1

Total held-to-maturity securities			36,992			122			3,222				122			40,214		244

Available-for Sale
Fixed maturity securities:
Corporate bonds		$	20,127		$	30		$	986			$	3		$	21,113	$	33
States and political subdivisions			14,689			82			12,700				1,677			27,389		1,759
U.S. agency-based mortgage-backed securities			605			79			7,031				2,176			7,636		2,255
Equity securities			480			6			—				—			480		6

Total available-for-sale securities			35,901			197			20,717				3,856			56,618		4,053

Total		$	72,893		$	319		$	23,939			$	3,978		$	96,832	$	4,297



		Less Than 12 Months						12 Months or Greater							Total
		Fair Value of			Gross			Fair Value of				Gross			Fair Value of		Gross
		Investments			Unrealized			Investments				Unrealized			Investments		Unrealized
		with			Losses			with				Losses			with		Losses
		Unrealized						Unrealized							Unrealized
		Losses						Losses							Losses
		(In thousands)
December 31, 2013
Held-to-Maturity
Fixed maturity securities:
Corporate bonds		$	14,090		$	41		$	—			$	—		$	14,090	$	41
States and political subdivisions			54,895			1,147			311				6			55,206		1,153
Asset-backed securities			—			—			1,916				144			1,916		144

Total held-to-maturity securities			68,985			1,188			2,227				150			71,212		1,338

Available-for Sale
Fixed maturity securities:
Corporate bonds		$	29,691		$	361		$	—			$	—		$	29,691	$	361
States and political subdivisions			101,908			4,798			1,753				342			103,661		5,140
U.S. agency-based mortgage-backed securities			1,303			465			5,772				2,502			7,075		2,967
Equity securities			5,205			567			—				—			5,205		567

Total available-for-sale securities			138,107			6,191			7,525				2,844			145,632		9,035

Total		$	207,092		$	7,379		$	9,752			$	2,994		$	216,844	$	10,373

At June 30, 2014, the Company held 88 individual fixed maturity securities and one equity security that were in an unrealized loss position, of which 26 individual fixed maturity securities were in a continuous unrealized loss position for longer than 12 months.
The Company holds investments in a long/short equity fund, accounted for under the equity method. The carrying value of this investment is $11.1 million at June 30, 2014.
Investment income is recognized as it is earned. The discount or premium on fixed maturity securities is amortized using the “constant yield” method. Anticipated prepayments, where applicable, are considered when determining the amortization of premiums or discounts. Realized investment gains and losses are determined using the specific identification method.
We regularly review our investment portfolio to evaluate the necessity of recording impairment losses for other-than-temporary declines in the fair value of our investments. We consider various factors in determining if a decline in the fair value of an individual security is other-than-temporary. The key factors we consider are:
	•		any reduction or elimination of dividends, or nonpayment of scheduled principal or interest payments;

	•		the financial condition and near-term prospects of the issuer of the applicable security, including any specific events that may affect its operations or earnings;

	•		how long and by how much the fair value of the security has been below its cost or amortized cost;

	•		any downgrades of the security by a rating agency;

	•		our intent not to sell the security for a sufficient time period for it to recover its value;

	•		the likelihood of being forced to sell the security before the recovery of its value; and

	•		an evaluation as to whether there are any credit losses on debt securities.
We reviewed all securities with unrealized losses in accordance with the impairment policy described above. The Company expects to hold investments in equity securities for a reasonable period of time sufficient for a recovery of fair value. We determined that the unrealized losses in the fixed maturity securities portfolio related primarily to changes in market interest rates since the date of purchase, current conditions in the capital markets and the impact of those conditions on market liquidity and prices generally, and the transfer of the investments from the available-for-sale classification to the held-to-maturity classification in January 2004. We expect to recover the carrying value of these securities as it is not more likely than not that we will be required to sell the security before the recovery of its amortized cost basis. In addition, none of the unrealized losses on debt securities are considered credit losses.

Net realized gains on investments in the six months ended June 30, 2014 totaled $0.3 million resulting from gains on called fixed maturity securities and the sale of equity securities. Net realized losses in the six months ended June 30, 2013 were $1.3 million from the impairment losses recognized for other-than-temporary declines in the fair value of certain equity securities of $1.9 million offset by realized gains of $0.6 from the sale of equity and fixed maturity securities classified as available-for-sale.

Income_Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 5. Income Taxes
	In accordance with FASB ASC Topic 740, “Income Taxes,” we provide for the recognition and measurement of deferred income tax benefits based on the likelihood of their realization in future years. As of June 30, 2014, the Company had no material unrecognized tax benefits and no adjustments to liabilities or operations were required.
	The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. There were no uncertain tax positions recognized for the periods ended June 30, 2014 and 2013.
	Tax years 2009 through 2013 are subject to examination by the federal and state taxing authorities. In April 2012, the Company was notified by the Internal Revenue Service that the examination for tax year 2009 had been completed, but remains subject to state taxing authorities.

Comprehensive_Income_and_Accum

Comprehensive Income and Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Comprehensive Income and Accumulated Other Comprehensive Income	'
	Note 6. Comprehensive Income and Accumulated Other Comprehensive Income
	Comprehensive income was $15.8 million for the three months ended June 30, 2014, compared to $3.6 million for the three months ended June 30, 2013. The difference between net income as reported and comprehensive income was due to changes in unrealized gains and losses, net of tax on available-for-sale securities.
	Comprehensive income includes net income plus unrealized gains/losses on our available-for-sale investment securities, net of tax. In reporting comprehensive income on a net basis in the statement of income, we used a 35 percent tax rate. The following table illustrates the changes in the balance of each component of accumulated other comprehensive income for each period presented in the interim financial statements.


		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(in thousands)
	Beginning balance	$	(1,055	)	$	2,434		$	(4,295	)	$	2,979
	Other comprehensive income/(loss) before reclassification		3,143			(4,442	)		6,120			(4,857	)
	Amounts reclassified from accumulated other comprehensive income		(127	)		382			136			252

	Net current period other comprehensive income/(loss)		3,016			(4,060	)		6,256			(4,605	)

	Ending balance	$	1,961		$	(1,626	)	$	1,961		$	(1,626	)


	The sale or other-than-temporary impairment of an available-for-sale security results in amounts being reclassified from accumulated other comprehensive income to current period net income. The effects of reclassifications out of accumulated other comprehensive income by the respective line items of net income are presented in the following table.


	Component of Accumulated Other	Three Months Ended						Six Months Ended						Affected line item in the statement of income
	Comprehensive Income	June 30,						June 30,						Affected line item in the statement of income
		2014			2013			2014			2013
		(in thousands)
	Unrealized gains/(losses) on available-for-sale securities	$	195		$	209		$	(209	)	$	92		Net realized gains on investments
	Other-than-temporary impairment		—			(797	)		—			(479	)	Net realized gains on investments

			195			(588	)		(209	)		(387	)	Income before income taxes
			(68	)		206			73			135		Income tax expense

		$	127		$	(382	)	$	(136	)	$	(252	)	Net income

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Note 7. Fair Value Measurements
	We carry available-for-sale securities at fair value in our consolidated financial statements and determine fair value measurements and disclosure in accordance with FASB ASC Topic 820, “Fair Value Measurements and Disclosures.”
	The Company determines the fair values of its financial instruments based on the fair value hierarchy established in ASC Topic 820, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard defines fair value, describes three levels of inputs that may be used to measure fair value, and expands disclosures about fair value measurements.
	Fair value is defined in ASC Topic 820 as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is the price to sell an asset or transfer a liability and, therefore, represents an exit price, not an entry price. Fair value is the exit price in the principal market (or, if lacking a principal market, the most advantageous market) in which the reporting entity would transact. Fair value is a market-based measurement, not an entity-specific measurement, and, as such, is determined based on the assumptions that market participants would use in pricing the asset or liability. The exit price objective of a fair value measurement applies regardless of the reporting entity’s intent and/or ability to sell the asset or transfer the liability at the measurement date.
	ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset, also known as current replacement cost. Valuation techniques used to measure fair value are to be consistently applied.
	In ASC Topic 820, inputs refer broadly to the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, for example, the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and/or the risk inherent in the inputs to the valuation technique. Inputs may be observable or unobservable:
		•		Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the reporting entity.

		•		Unobservable inputs are inputs that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.
	Valuation techniques used to measure fair value are intended to maximize the use of observable inputs and minimize the use of unobservable inputs. ASC Topic 820 establishes a fair value hierarchy that prioritizes the use of inputs used in valuation techniques into the following three levels:
		•		Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

		•		Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs that are derived principally from or corroborated by observable market data.

		•		Level 3 inputs are unobservable inputs for the asset or liability. Unobservable inputs are to be used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date.
	In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters.
	The fair values of the Company’s investments are based upon prices provided by an independent pricing service. The Company has reviewed these prices for reasonableness and has not adjusted any prices received from the independent provider. Securities reported at fair value utilizing Level 1 inputs represent assets whose fair value is determined based upon observable unadjusted quoted market prices for identical assets in active markets. Level 2 securities represent assets whose fair value is determined using observable market information such as previous day trade prices, quotes from less active markets or quoted prices of securities with similar characteristics. There were no transfers between Level 1 and Level 2 during the six months ended June 30, 2014.
	At June 30, 2014, assets and liabilities measured at fair value on a recurring basis are summarized below:


			Level 1			Level 2			Level 3			Total Fair
			Inputs			Inputs			Inputs			Value
			(in thousands)
	Financial instruments carried at fair value, classified as a part of:
	Other investments		$	—		$	—		$	11,092		$	11,092
	Securities available for sale—equity:
	Domestic common stock			3,980			—			—			3,980
	Securities available for sale—fixed maturity:
	States and political subdivisions			—			155,092			—			155,092
	Corporate bonds			—			121,763			—			121,763
	U.S. agency-based mortgage-backed securities			—			7,758			—			7,758

	Total securities available for sale—fixed maturity			—			284,613			—			284,613

	Total available for sale		$	3,980		$	284,613		$	11,092		$	299,685

	At June 30, 2014, assets and liabilities measured at amortized cost are summarized below:


			Level 1			Level 2			Level 3			Total Fair
			Inputs			Inputs			Inputs			Value
			(in thousands)
	Securities held-to-maturity—fixed maturity
	States and political subdivisions		$	—		$	414,136		$	—		$	414,136
	Corporate bonds			—			103,624			—			103,624
	Commercial mortgage-backed securities			—			52,094			—			52,094
	U.S. agency-based mortgage-backed securities			—			21,062			—			21,062
	U.S. Treasury securities			7,339			—			—			7,339
	Obligations of U.S. government agencies			—			6,051			—			6,051
	Asset-backed securities			—			3,206			—			3,206

	Total held-to-maturity		$	7,339		$	600,173		$	—		$	607,512


	At December 31, 2013, assets and liabilities measured at fair value on a recurring basis are summarized below:


			Level 1			Level 2			Level 3			Total Fair
			Inputs			Inputs			Inputs			Value
			(in thousands)
	Financial instruments carried at fair value, classified as part of:
	Other investments		$	—		$	—		$	10,591		$	10,591
	Securities available for sale—equity
Domestic common stock			9,302			—			—			9,302
Securities available for sale—fixed maturity
States and political subdivisions			—			150,375			—			150,375
Corporate bonds			—			80,428			—			80,428
U.S. agency-based mortgage-backed securities			—			7,074			—			7,074

Total available for sale—fixed maturity			—		$	237,877		$	—		$	237,877

Total available for sale		$	9,302		$	237,877		$	10,591		$	257,770

At December 31, 2013, assets and liabilities measured at amortized cost are summarized below:


		Level 1			Level 2			Level 3			Total Fair
		Inputs			Inputs			Inputs			Value
		(in thousands)
Securities held-to-maturity—fixed maturity
States and political subdivisions		$	—		$	399,155		$	—		$	399,155
Corporate bonds			—			68,243			—			68,243
Commercial mortgage-backed securities			—			54,244			—			54,244
U.S. agency-based mortgage-backed securities			—			23,565			—			23,565
U.S. Treasury securities			6,602			—			—			6,602
Obligations of U.S. government agencies			—			5,914			—			5,914
Asset-backed securities			—			3,456			—			3,456

Total held-to-maturity		$	6,602		$	554,577		$	—		$	561,179

The Company determines fair value amounts for financial instruments using available third-party market information. When such information is not available, the Company determines the fair value amounts using appropriate valuation methodologies. Nonfinancial instruments such as real estate, property and equipment, deferred policy acquisition costs, deferred income taxes and loss and loss adjustment expense reserves are excluded from the fair value disclosure.
Cash and Cash Equivalents—The carrying amounts reported in the accompanying consolidated balance sheets for these financial instruments approximate their fair values, which are characterized as Level 1 assets.
Investments—The fair values for fixed maturity and equity securities are based on prices obtained from an independent pricing service. Equity and treasury securities are characterized as Level 1 assets, as their fair values are based on quoted prices in active markets. Fixed maturity securities, other than treasury securities, are characterized as Level 2 assets, as their fair values are determined using observable market inputs.
Short Term Investments—The carrying amounts reported in the accompanying consolidated balance sheets for these financial instruments approximate their fair values. These securities are characterized as Level 2 assets in the fair value hierarchy.
Other Investments—Other investments consist of limited partnership (LP) interests valued using the net asset value provided by the general partner of the LP, which approximates the fair value of the interest. The LP’s objective is to generate absolute returns by investing long and short in publicly-traded global securities. Redemptions are allowed monthly following a sixty day notice with no lock up periods. The Company has no unfunded commitments related to the LP. This investment is characterized as a Level 3 asset in the fair value hierarchy.

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


		As of June 30, 2014						As of December 31, 2013
		Carrying			Fair			Carrying			Fair
		Amount			Value			Amount			Value
		(in thousands)
Assets:
Fixed maturity securities—held-to-maturity		$	579,145		$	607,512		$	536,583		$	561,179
Fixed maturity securities—available-for-sale			284,613			284,613			237,877			237,877
Equity securities			3,980			3,980			9,302			9,302
Cash and cash equivalents			98,818			98,818			123,077			123,077
Short-term investments			85,806			85,806			84,422			84,422
Other investments			11,092			11,092			10,591			10,591
The following table presents summary information regarding changes in the fair value of assets measured at fair value using Level 3 input.


		June 30, 2014			December 31, 2013
		(in thousands)
Beginning balance		$	10,591		$	—
Purchases			—			10,000
Total gains unrealized (Included in earnings as part of net investment income)			501			591

Ending Balance		$	11,092		$	10,591

The purchase reported on the Level 3 table above is related to an interest in a limited partnership.

Treasury_Stock

Treasury Stock	6 Months Ended
Treasury Stock	Jun. 30, 2014
Equity [Abstract]	'
Treasury Stock	'
	Note 8. Treasury Stock
	The Company’s Board of Directors initiated a share repurchase program in February 2010. In October 2011, October 2012 and October 2013, the Board reauthorized this program with a new limit of $25.0 million. Unless reauthorized, the program will expire on December 31, 2014. Since the beginning of this plan, the Company has repurchased a total of 1,258,250 shares for $22.4 million, or an average price of $17.78, including commissions.

Subsequent_Events

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 9. Subsequent Events
	On July 29, 2014, the Company’s Board of Directors declared a quarterly cash dividend of $0.12 per share, payable on September 26, 2014 to shareholders of record as of September 12, 2014. The Board intends to consider the payment of a regular cash dividend each calendar quarter.

Earnings_Per_Share_Policies

Earnings Per Share (Policies)	6 Months Ended
Earnings Per Share (Policies)	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
Earnings Per Share	The Company computes earnings per share ("EPS") in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 260, Earnings Per Share. Additionally, during 2013, the Company applied the “two-class method” in computing basic and diluted earnings per share as a result of the participating unvested common shares which contained nonforfeitable rights to dividends during this period. As of January 1, 2014, the Company no longer has participating unvested common shares which contain nonforfeitable rights to dividends and now applies the treasury stock method in computing basic and diluted earnings per share.
Income Taxes	'
Income Taxes	In accordance with FASB ASC Topic 740, “Income Taxes,” we provide for the recognition and measurement of deferred income tax benefits based on the likelihood of their realization in future years. As of June 30, 2014, the Company had no material unrecognized tax benefits and no adjustments to liabilities or operations were required.
Fair Value Measurements	'
	We carry available-for-sale securities at fair value in our consolidated financial statements and determine fair value measurements and disclosure in accordance with FASB ASC Topic 820, “Fair Value Measurements and Disclosures.”
	The Company determines the fair values of its financial instruments based on the fair value hierarchy established in ASC Topic 820, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard defines fair value, describes three levels of inputs that may be used to measure fair value, and expands disclosures about fair value measurements.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
Earnings Per Share (Tables)	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Summary of Earnings Per Share	'

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2014		2013		2014		2013
		(in thousands, except share and per share amounts)
	Basic EPS:
	Net income, as reported	$	12,773	$	7,644	$	23,322	$	16,495
	Less allocated income to unvested shares		—		26		—		41

	Net income available to common shareholders—basic	$	12,773	$	7,618	$	23,322	$	16,454

	Basic weighted average common shares		18,600,186		18,353,174		18,566,235		18,317,452
	Basic earnings per common share	$	0.69	$	0.42	$	1.26	$	0.9
	Diluted EPS:
	Net income available to common shareholders—diluted	$	12,773	$	7,619	$	23,322	$	16,455

	Diluted weighted average common shares:
	Weighted average common shares		18,600,186		18,353,174		18,566,235		18,317,452
	Stock options and performance shares		294,699		359,125		319,149		396,324

	Diluted weighted average common shares		18,894,885		18,712,299		18,885,384		18,713,776

	Diluted earnings per common share	$	0.68	$	0.41	$	1.23	$	0.88

Investments_Tables

Investments (Tables)	6 Months Ended
Investments (Tables)	Jun. 30, 2014
Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-maturity	'
	The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at June 30, 2014 are summarized as follows:


		Amortized Cost		Gross		Gross			Fair Value
				Unrealized		Unrealized
				Gains		Losses
		(in thousands)
	States and political subdivisions	$	392,381	$	21,821	$	(66	)	$	414,136
	Corporate bonds		102,925		756		(57	)		103,624
	Commercial mortgage-backed securities		49,327		2,767		—			52,094
	U.S. agency-based mortgage-backed securities		19,170		1,892		—			21,062
	U.S. Treasury securities and obligations of U.S. government agencies		12,259		1,132		(1	)		13,390
	Asset-backed securities		3,083		243		(120	)		3,206

	Totals	$	579,145	$	28,611	$	(244	)	$	607,512


	The gross unrealized gains and losses on, and the amortized cost and fair value of, those investments classified as held-to-maturity at December 31, 2013 are summarized as follows:


		Amortized Cost		Gross		Gross			Fair Value
				Unrealized		Unrealized
				Gains		Losses
		(in thousands)
	States and political subdivisions	$	381,674	$	18,634	$	(1,153	)	$	399,155
	Corporate bonds		67,423		861		(41	)		68,243
	Commercial mortgage-backed securities		50,813		3,431		—			54,244
	U.S. agency-based mortgage-backed securities		21,775		1,790		—			23,565
	U.S. Treasury securities and obligations of U.S. Government agencies		11,514		1,002		—			12,516
	Asset-backed securities		3,384		216		(144	)		3,456

	Totals	$	536,583	$	25,934	$	(1,338	)	$	561,179

Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-sale	'
	The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at June 30, 2014 are summarized as follows:


		Cost or		Gross		Gross			Fair Value
		Amortized Cost		Unrealized		Unrealized
				Gains		Losses
		(in thousands)
	Fixed maturity:
	States and political subdivisions	$	151,140	$	5,711	$	(1,759	)	$	155,092
	Corporate bonds		121,088		708		(33	)		121,763
	U.S. agency-based mortgage-backed securities		10,012		1		(2,255	)		7,758

	Total fixed maturity		282,240		6,420		(4,047	)		284,613
	Other investments		10,000		1,092		—			11,092
	Equity securities		3,446		540		(6	)		3,980

	Totals	$	295,686	$	8,052	$	(4,053	)	$	299,685


	The gross unrealized gains and losses on, and the cost or amortized cost and fair value of, those investments classified as available-for-sale at December 31, 2013 are summarized as follows:


		Cost or		Gross		Gross			Fair Value
		Amortized Cost		Unrealized		Unrealized
				Gains		Losses
		(in thousands)
	Fixed maturity:
	States and political subdivisions	$	154,024	$	1,491	$	(5,140	)	$	150,375
	Corporate bonds		80,344		445		(361	)		80,428
	U.S. agency-based mortgage-backed securities		10,041		—		(2,967	)		7,074

	Total fixed maturity		244,409		1,936		(8,468	)		237,877
	Other investments		10,000		591		—			10,591
	Equity securities		9,482		387		(567	)		9,302

	Totals	$	263,891	$	2,914	$	(9,035	)	$	257,770

Investment Securities Continuous Unrealized Loss Position	'
	The following table summarizes the fair value and gross unrealized losses on securities, aggregated by major investment category and length of time that the individual securities have been in a continuous unrealized loss position:


		Less Than 12 Months				12 Months or Greater					Total
		Fair Value of		Gross		Fair Value of			Gross		Fair Value of		Gross
		Investments		Unrealized		Investments			Unrealized		Investments		Unrealized
		with		Losses		with			Losses		with		Losses
		Unrealized				Unrealized					Unrealized
		Losses				Losses					Losses
		(In thousands)
	June 30, 2014
	Held-to-Maturity
	Fixed maturity securities:
	Corporate bonds	$	19,268	$	57	$	—		$	—	$	19,268	$	57
	States and political subdivisions		14,872		64		1,423			2		16,295		66
	Asset-backed securities		—		—		1,799			120		1,799		120
	U.S. Treasury securities and obligations of U.S. government agencies		2,852		1		—			—		2,852		1

	Total held-to-maturity securities		36,992		122		3,222			122		40,214		244

	Available-for Sale
	Fixed maturity securities:
	Corporate bonds	$	20,127	$	30	$	986		$	3	$	21,113	$	33
	States and political subdivisions		14,689		82		12,700			1,677		27,389		1,759
	U.S. agency-based mortgage-backed securities		605		79		7,031			2,176		7,636		2,255
	Equity securities		480		6		—			—		480		6

	Total available-for-sale securities		35,901		197		20,717			3,856		56,618		4,053

	Total	$	72,893	$	319	$	23,939		$	3,978	$	96,832	$	4,297



		Less Than 12 Months				12 Months or Greater					Total
		Fair Value of		Gross		Fair Value of			Gross		Fair Value of		Gross
		Investments		Unrealized		Investments			Unrealized		Investments		Unrealized
		with		Losses		with			Losses		with		Losses
		Unrealized				Unrealized					Unrealized
		Losses				Losses					Losses
		(In thousands)
	December 31, 2013
	Held-to-Maturity
	Fixed maturity securities:
	Corporate bonds	$	14,090	$	41	$	—		$	—	$	14,090	$	41
	States and political subdivisions		54,895		1,147		311			6		55,206		1,153
	Asset-backed securities		—		—		1,916			144		1,916		144

	Total held-to-maturity securities		68,985		1,188		2,227			150		71,212		1,338

	Available-for Sale
	Fixed maturity securities:
	Corporate bonds	$	29,691	$	361	$	—		$	—	$	29,691	$	361
	States and political subdivisions		101,908		4,798		1,753			342		103,661		5,140
	U.S. agency-based mortgage-backed securities		1,303		465		5,772			2,502		7,075		2,967
	Equity securities		5,205		567		—			—		5,205		567

	Total available-for-sale securities		138,107		6,191		7,525			2,844		145,632		9,035

	Total	$	207,092	$	7,379	$	9,752		$	2,994	$	216,844	$	10,373

Held-to-maturity securities [Member]	'
Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity	'
	A summary of the cost and fair value of investments in fixed maturity securities, classified as held-to-maturity at June 30, 2014, by contractual maturity, is as follows:


	Remaining Time to Maturity	Amortized		Fair Value
	Remaining Time to Maturity	Cost Basis		Fair Value
		(in thousands)
	Less than one year	$	55,153	$	55,726
	One to five years		186,929		194,771
	Five to ten years		140,954		150,762
	More than ten years		124,529		129,891
	U.S. agency-based mortgage-backed securities		19,170		21,062
	Commercial mortgage-backed securities		49,327		52,094
	Asset-backed securities		3,083		3,206

	Total	$	579,145	$	607,512

Available-for-sale securities [Member]	'
Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, by Contractual Maturity	'
	A summary of cost and fair value of investments in fixed maturity securities, classified as available-for-sale at June 30, 2014, by contractual maturity, is as follows:


	Remaining Time to Maturity	Amortized		Fair Value
	Remaining Time to Maturity	Cost Basis		Fair Value
		(in thousands)
	Less than one year	$	34,052	$	34,120
	One to five years		84,799		85,482
	Five to ten years		14,305		14,661
	More than ten years		139,072		142,592
	U.S. agency-based mortgage-backed securities		10,012		7,758

	Total	$	282,240	$	284,613

Comprehensive_Income_and_Accum1

Comprehensive Income and Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Schedule of Changes in Accumulated Other Comprehensive Income (AOCI)	'
	The following table illustrates the changes in the balance of each component of accumulated other comprehensive income for each period presented in the interim financial statements.


		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(in thousands)
	Beginning balance	$	(1,055	)	$	2,434		$	(4,295	)	$	2,979
	Other comprehensive income/(loss) before reclassification		3,143			(4,442	)		6,120			(4,857	)
	Amounts reclassified from accumulated other comprehensive income		(127	)		382			136			252

	Net current period other comprehensive income/(loss)		3,016			(4,060	)		6,256			(4,605	)

	Ending balance	$	1,961		$	(1,626	)	$	1,961		$	(1,626	)

Reclassification Out of Accumulated Other Comprehensive Income	'
	The effects of reclassifications out of accumulated other comprehensive income by the respective line items of net income are presented in the following table.


	Component of Accumulated Other	Three Months Ended						Six Months Ended						Affected line item in the statement of
	Comprehensive Income	June 30,						June 30,						income
		2014			2013			2014			2013
		(in thousands)
	Unrealized gains/(losses) on available-for-sale securities	$	195		$	209		$	(209	)	$	92		Net realized gains on investments
	Other-than-temporary impairment		—			(797	)		—			(479	)	Net realized gains on investments

			195			(588	)		(209	)		(387	)	Income before income taxes
			(68	)		206			73			135		Income tax expense

		$	127		$	(382	)	$	(136	)	$	(252	)	Net income

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	'

	At June 30, 2014, assets and liabilities measured at fair value on a recurring basis are summarized below:


		Level 1		Level 2		Level 3		Total Fair
		Inputs		Inputs		Inputs		Value
		(in thousands)
	Financial instruments carried at fair value, classified as a part of:
	Other investments	$	—	$	—	$	11,092	$	11,092
	Securities available for sale—equity:
	Domestic common stock		3,980		—		—		3,980
	Securities available for sale—fixed maturity:
	States and political subdivisions		—		155,092		—		155,092
	Corporate bonds		—		121,763		—		121,763
	U.S. agency-based mortgage-backed securities		—		7,758		—		7,758

	Total securities available for sale—fixed maturity		—		284,613		—		284,613

	Total available for sale	$	3,980	$	284,613	$	11,092	$	299,685


	At December 31, 2013, assets and liabilities measured at fair value on a recurring basis are summarized below:

		Level 1		Level 2		Level 3		Total Fair
		Inputs		Inputs		Inputs		Value
		(in thousands)
	Financial instruments carried at fair value, classified as part of:
	Other investments	$	—	$	—	$	10,591	$	10,591
	Securities available for sale—equity
	Domestic common stock		9,302		—		—		9,302
	Securities available for sale—fixed maturity
	States and political subdivisions		—		150,375		—		150,375
	Corporate bonds		—		80,428		—		80,428
	U.S. agency-based mortgage-backed securities		—		7,074		—		7,074

	Total available for sale—fixed maturity		—	$	237,877	$	—	$	237,877

	Total available for sale	$	9,302	$	237,877	$	10,591	$	257,770

Schedule of Assets and Liabilities Measured at Amortized Cost	'
	At June 30, 2014, assets and liabilities measured at amortized cost are summarized below:


		Level 1		Level 2		Level 3		Total Fair
		Inputs		Inputs		Inputs		Value
		(in thousands)
	Securities held-to-maturity—fixed maturity
	States and political subdivisions	$	—	$	414,136	$	—	$	414,136
	Corporate bonds		—		103,624		—		103,624
	Commercial mortgage-backed securities		—		52,094		—		52,094
	U.S. agency-based mortgage-backed securities		—		21,062		—		21,062
	U.S. Treasury securities		7,339		—		—		7,339
	Obligations of U.S. government agencies		—		6,051		—		6,051
	Asset-backed securities		—		3,206		—		3,206

	Total held-to-maturity	$	7,339	$	600,173	$	—	$	607,512


	At December 31, 2013, assets and liabilities measured at amortized cost are summarized below:


		Level 1		Level 2		Level 3		Total Fair
		Inputs		Inputs		Inputs		Value
		(in thousands)
	Securities held-to-maturity—fixed maturity
	States and political subdivisions	$	—	$	399,155	$	—	$	399,155
	Corporate bonds		—		68,243		—		68,243
	Commercial mortgage-backed securities		—		54,244		—		54,244
	U.S. agency-based mortgage-backed securities		—		23,565		—		23,565
	U.S. Treasury securities		6,602		—		—		6,602
	Obligations of U.S. government agencies		—		5,914		—		5,914
	Asset-backed securities		—		3,456		—		3,456

	Total held-to-maturity	$	6,602	$	554,577	$	—	$	561,179

Summary of Carrying Values and Corresponding Fair Values for Financial Instruments	'
	The following table summarizes the carrying values and corresponding fair values for financial instruments:


		As of June 30, 2014				As of December 31, 2013
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
		(in thousands)
	Assets:
	Fixed maturity securities—held-to-maturity	$	579,145	$	607,512	$	536,583	$	561,179
	Fixed maturity securities—available-for-sale		284,613		284,613		237,877		237,877
	Equity securities		3,980		3,980		9,302		9,302
	Cash and cash equivalents		98,818		98,818		123,077		123,077
	Short-term investments		85,806		85,806		84,422		84,422
	Other investments		11,092		11,092		10,591		10,591
Summary of Changes in Fair Value of Assets Measured at Fair value	'
	The following table presents summary information regarding changes in the fair value of assets measured at fair value using Level 3 input.


		June 30, 2014		December 31, 2013
		(in thousands)
	Beginning balance	$	10,591	$	—
	Purchases		—		10,000
	Total gains unrealized (Included in earnings as part of net investment income)		501		591

	Ending Balance	$	11,092	$	10,591

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail)	6 Months Ended
Basis of Presentation - Additional Information (Detail)	Jun. 30, 2014	Jun. 30, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'	'
Percentage of comparable consolidated amounts	95.00%	95.00%

Stock_Options_and_Restricted_S1

Stock Options and Restricted Stock - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
	Incentive_Plan	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of equity incentive plans	3	'
Market value of restricted shares granted	$200,000	'
Stock options exercised, Shares	123,167	125,000
Proceeds from stock option exercises	1,127,000	1,125,000
Share-based compensation expense	$400,000	$700,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Directors [Member] \| 2010 Restricted Stock Plan [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Restricted common stock granted	4,866	'

Earnings_Per_Share_Summary_of_

Earnings Per Share - Summary of Earnings Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Basic [Abstract]	'	'	'	'
Net income	$12,773	$7,644	$23,322	$16,495
Less allocated income to unvested shares	0	26	0	41
Net income	12,773	7,618	23,322	16,454
Basic weighted average common shares	18,600,186	18,353,174	18,566,235	18,317,452
Basic earnings per common share	$0.69	$0.42	$1.26	$0.90
Net income available to common shareholders-diluted	$12,773	$7,618	$23,322	$16,454
Weighted average common shares	18,600,186	18,353,174	18,566,235	18,317,452
Stock options and performance shares	294,699	359,125	319,149	396,324
Diluted weighted average common shares	18,894,885	18,712,299	18,885,384	18,713,776
Diluted earnings per common share	$0.68	$0.41	$1.23	$0.88

Investments_Gross_Unrealized_G

Investments - Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-maturity (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]	'	'
Amortized Cost	$579,145	$536,583
Gross Unrealized Gains	28,611	25,934
Gross Unrealized Losses	-244	-1,338
Fair Value	607,512	561,179
States and political subdivisions [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	392,381	381,674
Gross Unrealized Gains	21,821	18,634
Gross Unrealized Losses	-66	-1,153
Fair Value	414,136	399,155
Corporate bonds [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	102,925	67,423
Gross Unrealized Gains	756	861
Gross Unrealized Losses	-57	-41
Fair Value	103,624	68,243
Commercial mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	49,327	50,813
Gross Unrealized Gains	2,767	3,431
Fair Value	52,094	54,244
U.S. agency-based mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	19,170	21,775
Gross Unrealized Gains	1,892	1,790
Fair Value	21,062	23,565
U.S. Treasury securities and obligations of U.S. government agencies [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	12,259	11,514
Gross Unrealized Gains	1,132	1,002
Gross Unrealized Losses	-1	'
Fair Value	13,390	12,516
Asset-backed securities [Member]	'	'
Investment [Line Items]	'	'
Amortized Cost	3,083	3,384
Gross Unrealized Gains	243	216
Gross Unrealized Losses	-120	-144
Fair Value	$3,206	$3,456

Investments_Gross_Unrealized_G1

Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-sale (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]	'	'
Cost or Amortized Cost	$295,686	$263,891
Gross Unrealized Gains	8,052	2,914
Gross Unrealized Losses	-4,053	-9,035
Fair Value	299,685	257,770
Total fixed maturity [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	282,240	244,409
Gross Unrealized Gains	6,420	1,936
Gross Unrealized Losses	-4,047	-8,468
Fair Value	284,613	237,877
Other investments [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	10,000	10,000
Gross Unrealized Gains	1,092	591
Fair Value	11,092	10,591
States and political subdivisions [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	151,140	154,024
Gross Unrealized Gains	5,711	1,491
Gross Unrealized Losses	-1,759	-5,140
Fair Value	155,092	150,375
Corporate bonds [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	121,088	80,344
Gross Unrealized Gains	708	445
Gross Unrealized Losses	-33	-361
Fair Value	121,763	80,428
U.S. agency-based mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	10,012	10,041
Gross Unrealized Gains	1	'
Gross Unrealized Losses	-2,255	-2,967
Fair Value	7,758	7,074
Equity securities [Member]	'	'
Investment [Line Items]	'	'
Cost or Amortized Cost	3,446	9,482
Gross Unrealized Gains	540	387
Gross Unrealized Losses	-6	-567
Fair Value	$3,980	$9,302

Investments_Summary_of_Amortiz

Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Held-to-maturity (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]	'	'
Less than one year, Amortized Cost	$55,153	'
One to five years, Amortized Cost	186,929	'
Five to ten years, Amortized Cost	140,954	'
More than ten years, Amortized Cost	124,529	'
Total, Amortized Cost	579,145	536,583
Less than one year, Fair Value	55,726	'
One to five years, Fair Value	194,771	'
Five to ten years, Fair Value	150,762	'
More than ten years, Fair Value	129,891	'
Total, Fair Value	607,512	561,179
U.S. agency-based mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity, Amortized Cost	19,170	'
Held-to-maturity, Fair Value	21,062	'
Commercial mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity, Amortized Cost	49,327	'
Held-to-maturity, Fair Value	52,094	'
Asset-backed securities [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity, Amortized Cost	3,083	'
Held-to-maturity, Fair Value	$3,206	'

Investments_Summary_of_Amortiz1

Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-sale (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]	'	'
Less than one year, Amortized Cost	$34,052	'
One to five years, Amortized Cost	84,799	'
Five to ten years, Amortized Cost	14,305	'
More than ten years, Amortized Cost	139,072	'
Total, Amortized Cost	282,240	244,409
Less than one year, Fair Value	34,120	'
One to five years, Fair Value	85,482	'
Five to ten years, Fair Value	14,661	'
More than ten years, Fair Value	142,592	'
Total, Fair Value	284,613	237,877
U.S. agency-based mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Available for sale securities, Amortized Cost	10,012	'
Available for sale securities, Fair Value	$7,758	'

Investments_Investment_Securit

Investments - Investment Securities Continuous Unrealized Loss Position (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment [Line Items]	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$36,992	$68,985
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss	122	1,188
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,222	2,227
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss	122	150
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	40,214	71,212
Gross Unrealized Losses	244	1,338
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	35,901	138,107
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	197	6,191
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	20,717	7,525
Gross Unrealized Losses, 12 Months or Greater	3,856	2,844
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	56,618	145,632
Available-for Sale, Gross Unrealized Losses, Total	4,053	9,035
Corporate bonds [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	19,268	14,090
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss	57	41
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	19,268	14,090
Gross Unrealized Losses	57	41
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	20,127	29,691
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	30	361
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	986	'
Gross Unrealized Losses, 12 Months or Greater	3	'
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	21,113	29,691
Available-for Sale, Gross Unrealized Losses, Total	33	361
States and political subdivisions [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	14,872	54,895
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss	64	1,147
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,423	311
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss	2	6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	16,295	55,206
Gross Unrealized Losses	66	1,153
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	14,689	101,908
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	82	4,798
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	12,700	1,753
Gross Unrealized Losses, 12 Months or Greater	1,677	342
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	27,389	103,661
Available-for Sale, Gross Unrealized Losses, Total	1,759	5,140
U.S. agency-based mortgage-backed securities [Member]	'	'
Investment [Line Items]	'	'
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	605	1,303
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	79	465
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	7,031	5,772
Gross Unrealized Losses, 12 Months or Greater	2,176	2,502
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	7,636	7,075
Available-for Sale, Gross Unrealized Losses, Total	2,255	2,967
Equity securities [Member]	'	'
Investment [Line Items]	'	'
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months	480	5,205
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months	6	567
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	'	'
Gross Unrealized Losses, 12 Months or Greater	'	'
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total	480	5,205
Available-for Sale, Gross Unrealized Losses, Total	6	567
Asset-backed securities [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,799	1,916
Held-to-maturity Securities, Continuous Unrealized Loss Position Twelve Months Or Longer, Accumulated Loss	120	144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	1,799	1,916
Gross Unrealized Losses	120	144
U.S. Treasury securities and obligations of U.S. government agencies [Member]	'	'
Investment [Line Items]	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,852	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, Accumulated Loss	1	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	2,852	'
Gross Unrealized Losses	1	'
Held-to-maturity securities [Member]	'	'
Investment [Line Items]	'	'
Fair Value of Investments with Unrealized Losses, Less Than 12 months	72,893	207,092
Gross Unrealized Loss, Less Than 12 Months	319	7,379
Fair Value of Investments with Unrealized Losses, 12 Months or Greater	23,939	9,752
Gross Unrealized Losses, 12 Months or Greater	3,978	2,994
Fair Value of Investments with Unrealized Losses, Total	96,832	216,844
Gross Unrealized Losses, Total	$4,297	$10,373

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
	Individual
	Equity
Investments Schedule [Abstract]	'	'
Individual fixed maturity held in unrealized loss position	88	'
Equity securities held in unrealized loss position	1	'
Individual fixed maturity held in unrealized loss position	26	'
Carrying value of investments	$11.10	'
Net realized investment gains (losses)	0.3	0.6
Impairment losses recognized	$1.30	$1.90

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Company recognized uncertain tax positions	$0	$0
Unrecognized tax benefits	$0	'

Comprehensive_Income_and_Accum2

Comprehensive Income and Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]	'	'	'	'
Comprehensive income	$15,789	$3,584	$29,578	$11,890
Comprehensive income tax rate	'	'	35.00%	'

Comprehensive_Income_and_Accum3

Comprehensive Income and Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (AOCI) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]	'	'	'	'
Beginning balance	($1,055)	$2,434	($4,295)	$2,979
Other comprehensive income/(loss) before reclassification	3,143	-4,442	6,120	-4,857
Amounts reclassified from accumulated other comprehensive income	-127	382	136	252
Net current period other comprehensive income/(loss)	3,016	-4,060	6,256	-4,605
Ending balance	$1,961	($1,626)	$1,961	($1,626)

Comprehensive_Income_and_Accum4

Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Income before income taxes	$17,061	$10,647	$30,465	$21,727
Income tax expense	-4,288	-3,003	-7,143	-5,232
Net income	12,773	7,618	23,322	16,454
Changes in net unrealized gains on investment securities [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Unrealized gains/(losses) on available for sale securities	195	209	-209	92
Other-than-temporary impairment	'	-797	'	-479
Income before income taxes	195	-588	-209	-387
Income tax expense	-68	206	73	135
Net income	$127	($382)	($136)	($252)

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	$299,685	$257,770
Equity securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	3,980	9,302
Other investments [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	11,092	10,591
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	299,685	257,770
Fair Value, Measurements, Recurring [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	284,613	237,877
Fair Value, Measurements, Recurring [Member] \| Other investments [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	11,092	10,591
Fair Value, Measurements, Recurring [Member] \| Common stock \| Equity securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	3,980	9,302
Fair Value, Measurements, Recurring [Member] \| States and political subdivisions [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	155,092	150,375
Fair Value, Measurements, Recurring [Member] \| Corporate bonds [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	121,763	80,428
Fair Value, Measurements, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	7,758	7,074
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	3,980	9,302
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member] \| Common stock \| Equity securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	3,980	9,302
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	284,613	237,877
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	284,613	237,877
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| States and political subdivisions [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	155,092	150,375
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Corporate bonds [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	121,763	80,428
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member] \| Debt Securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	7,758	7,074
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	11,092	10,591
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Other investments [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities available for sale/Available-for-sale, Fair value	$11,092	$10,591

Fair_Value_Measurements_Schedu1

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Amortized Cost (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	$607,512	$561,179
States and political subdivisions [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	414,136	399,155
Corporate bonds [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	103,624	68,243
Commercial mortgage-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	52,094	54,244
U.S. agency-based mortgage-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	21,062	23,565
US Treasury securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	7,339	6,602
Obligations of U.S. government agencies [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	6,051	5,914
Asset-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	3,206	3,456
Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	7,339	6,602
Fair Value, Inputs, Level 1 [Member] \| US Treasury securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	7,339	6,602
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	600,173	554,577
Fair Value, Inputs, Level 2 [Member] \| States and political subdivisions [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	414,136	399,155
Fair Value, Inputs, Level 2 [Member] \| Corporate bonds [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	103,624	68,243
Fair Value, Inputs, Level 2 [Member] \| Commercial mortgage-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	52,094	54,244
Fair Value, Inputs, Level 2 [Member] \| U.S. agency-based mortgage-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	21,062	23,565
Fair Value, Inputs, Level 2 [Member] \| Obligations of U.S. government agencies [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	6,051	5,914
Fair Value, Inputs, Level 2 [Member] \| Asset-backed securities [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Securities held-to-maturity-fixed maturity, Fair Value	$3,206	$3,456

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Carrying Values and Corresponding Fair Values for Financial Instruments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Of Financial Instruments [Line Items]	'	'
Fixed maturity securities-held-to-maturity	$607,512	$561,179
Fixed maturity securities-held-to-maturity	579,145	536,583
Fixed maturity securities-available-for-sale	284,613	237,877
Equity securities	3,980	9,302
Carrying Amount [Member]	'	'
Fair Value Of Financial Instruments [Line Items]	'	'
Fixed maturity securities-held-to-maturity	579,145	536,583
Fixed maturity securities-available-for-sale	284,613	237,877
Equity securities	3,980	9,302
Cash and cash equivalents	98,818	123,077
Short-term investments	85,806	84,422
Other investments	11,092	10,591
Fair Value [Member]	'	'
Fair Value Of Financial Instruments [Line Items]	'	'
Fixed maturity securities-held-to-maturity	607,512	561,179
Fixed maturity securities-available-for-sale	284,613	237,877
Equity securities	3,980	9,302
Cash and cash equivalents	98,818	123,077
Short-term investments	85,806	84,422
Other investments	$11,092	$10,591

Fair_Value_Measurements_Summar1

Fair Value Measurements - Summary of Changes in Fair Value of Assets Measured at Fair Value (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Beginning balance	$10,591	$0
Purchases	'	10,000
Total gains unrealized (Included in earnings as part of net investment income)	501	591
Ending Balance	$11,092	$10,591

Treasury_Stock_Additional_Info

Treasury Stock - Additional Information (Detail) (USD $)	1 Months Ended			6 Months Ended
In Millions, except Share data, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011	Jun. 30, 2014	Dec. 31, 2013
Equity [Abstract]	'	'	'	'	'
Share repurchase new limit amount	$25	$25	$25	'	'
Share repurchase program expiration date	'	'	'	31-Dec-14	'
Shares repurchased	'	'	'	1,258,250	1,258,250
Shares repurchased, value	'	'	'	$22.40	'
Shares repurchased, average price	'	'	'	$17.78	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], Dividend Declared [Member], USD $)	0 Months Ended
	Jul. 29, 2014
Subsequent Event [Member] \| Dividend Declared [Member]	'
Subsequent Event [Line Items]	'
Cash dividend per share	$0.12
Date of payment to shareholders entitled to dividends	26-Sep-14
Date of record of shareholders entitled to dividends	12-Sep-14