INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2017

INVESTMENTS [Abstract]

Summary of Amortized Cost and Fair Value of Debt and Equity Securities

	Amortized		Gross		Gross
	Cost		Unrealized		Unrealized
	or Cost		Gains		Losses		Fair Value
	(in thousands)
March 31, 2017
Debt securities  - available-for-sale:
United States government obligations and authorities	$	75,618	$	315	$	538	$	75,395
Obligations of states and political subdivisions		86,997		488		511		86,974
Corporate		197,041		1,723		717		198,047
International		15,533		115		94		15,554
		375,189		2,641		1,860		375,970
Debt securities  - held-to-maturity:
United States government obligations and authorities		4,162		21		100		4,083
Corporate		1,261		22		1		1,282
International		65		1		—		66
		5,488		44		101		5,431
Equity securities		37,750		6,839		586		44,003
Total investments	$	418,427	$	9,524	$	2,547	$	425,404

	Amortized		Gross		Gross
	Cost		Unrealized		Unrealized
	or Cost		Gains		Losses			Fair Value
	(in thousands)
December 31, 2016
Debt securities  - available-for-sale:
United States government obligations and authorities	$	62,881	$	177	$	853	$	62,205
Obligations of states and political subdivisions		152,823		427		2,067		151,183
Corporate		149,053		1,347		895		149,505
International		11,887		95		119		11,863
		376,644		2,046		3,934		374,756
Debt securities  - held-to-maturity:
United States government obligations and authorities		4,163		22		118		4,067
Corporate		1,317		20		2		1,335
International		71		—		—		71
		5,551		42		120		5,473
Equity securities		24,163		5,500		288		29,375
Total investments	$	406,358	$	7,588	$	4,342	$	409,604

Net Realized Gains (Losses) by Major Investment Category

	Three Months Ended
	March 31,
	2017		2016
	(in thousands)
Gross realized gains:
Debt securities	$	570	$	1,304
Equity securities		560		738
Total gross realized gains		1,130		2,042
Gross realized losses:
Debt securities		(1,092)		(540)
Equity securities		(143)		(575)
Total gross realized losses		(1,235)		(1,115)
Net realized (losses) gains on investments	$	(105)	$	927

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity

	March 31, 2017				December 31, 2016
	Amortized				Amortized
	Cost		Fair Value		Cost		Fair Value
Securities with maturity dates:	(in thousands)
Debt securities, available-for-sale:
One year or less	$	34,393	$	34,469	$	46,189	$	46,231
Over one through five years		177,620		178,374		177,982		177,899
Over five through ten years		161,961		161,955		150,557		148,783
Over ten years		1,215		1,172		1,916		1,843
		375,189		375,970		376,644		374,756
Debt securities, held-to-maturity:
One year or less		184		185		170		170
Over one through five years		1,763		1,795		1,719		1,750
Over five through ten years		3,541		3,451		3,662		3,553
		5,488		5,431		5,551		5,473
Total	$	380,677	$	381,401	$	382,195	$	380,229

Summary of Net Investment Income

	Three Months Ended
	March 31,
	2017		2016
		(in thousands)
Interest income	$	2,169	$	1,853
Dividends income		149		187
Net investment income	$	2,318	$	2,040

Gross Unrealized Losses and Related Fair Values for Debt and Equity Securities, Grouped by Duration of Time in Continuous Unrealized Loss Position

	Less than 12 months				12 months or longer				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
March 31, 2017					(in thousands)
Debt securities - available-for-sale:
United States government obligations
and authorities	$	33,711	$	535	$	106	$	3	$	33,817	$	538
Obligations of states and political subdivisions		37,406		511		-		-		37,406		511
Corporate		65,054		702		1,779		15		66,833		717
International		6,214		94		5		-		6,219		94
		142,385		1,842		1,890		18		144,275		1,860
Equity securities		6,727		416		832		170		7,559		586
Total investments	$	149,112	$	2,258	$	2,722	$	188	$	151,834	$	2,446

	Less than 12 months				12 months or longer				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
December 31, 2016					(in thousands)
Debt securities - available-for-sale:
United States government obligations
and authorities	$	45,255	$	850	$	111	$	3	$	45,366	$	853
Obligations of states and political subdivisions		103,724		2,066		1,007		1		104,731		2,067
Corporate		59,970		864		2,427		31		62,397		895
International		5,925		119		5		-		5,930		119
		214,874		3,899		3,550		35		218,424		3,934
Equity securities		4,701		253		434		35		5,135		288
Total investments	$	219,575	$	4,152	$	3,984	$	70	$	223,559	$	4,222