SEGMENT INFORMATION - Summarized financial information by segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	$ 138,316	$ 132,362	$ 405,348	$ 380,048
Underwriting profit (loss)	(9,788)	(1,096)	(20,267)	3,613
Net investment income (loss)	11,503	10,545	34,434	32,028
Realized investment gains (losses)	(390)	1,007	3,215	3,850
Other income	202	195	584	593
Interest expense	84	84	253	300
Other expenses	(440)	1,003	671	1,762
Income before income tax expense (benefit)	1,883	9,564	17,042	38,022
Reconciliation of assets from segment to consolidated
Assets	1,976,826		1,976,826		1,821,398
Eliminations	(475,456)		(475,456)		(441,984)
Reclassifications					(481)
Total assets	1,501,370		1,501,370		1,378,933
Property and casualty insurance [Member]
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	107,952	100,085	312,716	290,607
Underwriting profit (loss)	(4,414)	(3,945)	(15,868)	(11,752)
Net investment income (loss)	8,230	7,677	24,818	23,422
Realized investment gains (losses)	(286)	720	2,293	3,069
Other income	202	195	584	593
Interest expense	84	84	253	300
Other expenses	132	163	540	554
Income before income tax expense (benefit)	3,516	4,400	11,034	14,478
Reconciliation of assets from segment to consolidated
Assets	1,069,564		1,069,564		978,746
Eliminations	0		0		0
Reclassifications					0
Total assets	1,069,564		1,069,564		978,746
Reinsurance [Member]
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	30,364	32,277	92,632	89,441
Underwriting profit (loss)	(5,374)	2,849	(4,399)	15,365
Net investment income (loss)	3,275	2,870	9,624	8,613
Realized investment gains (losses)	(104)	287	922	781
Other income	0	0	0	0
Interest expense	0	0	0	0
Other expenses	(1,028)	557	(1,042)	217
Income before income tax expense (benefit)	(1,175)	5,449	7,189	24,542
Reconciliation of assets from segment to consolidated
Assets	421,292		421,292		387,284
Eliminations	0		0		0
Reclassifications					0
Total assets	421,292		421,292		387,284
Parent company [Member]
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	0	0	0	0
Underwriting profit (loss)	0	0	0	0
Net investment income (loss)	(2)	(2)	(8)	(7)
Realized investment gains (losses)	0	0	0	0
Other income	0	0	0	0
Interest expense	0	0	0	0
Other expenses	456	283	1,173	991
Income before income tax expense (benefit)	(458)	(285)	(1,181)	(998)
Reconciliation of assets from segment to consolidated
Assets	485,970		485,970		455,368
Eliminations	(475,456)		(475,456)		(441,984)
Reclassifications					(481)
Total assets	$ 10,514		$ 10,514		$ 12,903