SEGMENT INFORMATION - Summarized financial information by segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	$ 133,952	$ 127,189	$ 267,032	$ 247,686
Underwriting profit (loss)	(12,829)	(2,732)	(10,479)	4,709
Net investment income (loss)	11,076	11,040	22,931	21,483
Realized investment gains (losses)	2,343	175	3,605	2,843
Other income	181	163	382	398
Interest expense	85	85	169	216
Other expenses	416	612	1,111	759
Income before income tax expense	270	7,949	15,159	28,458
Reconciliation of assets from segment to consolidated
Assets	1,923,969		1,923,969		1,821,398
Eliminations	(473,962)		(473,962)		(441,984)
Reclassifications	(611)		(611)		(481)
Total assets	1,449,396		1,449,396		1,378,933
Property and casualty insurance [Member]
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	103,517	97,817	204,764	190,522
Underwriting profit (loss)	(10,979)	(10,423)	(11,454)	(7,807)
Net investment income (loss)	7,972	8,096	16,588	15,745
Realized investment gains (losses)	1,568	392	2,579	2,349
Other income	181	163	382	398
Interest expense	85	85	169	216
Other expenses	234	186	408	391
Income before income tax expense	(1,577)	(2,043)	7,518	10,078
Reconciliation of assets from segment to consolidated
Assets	1,024,174		1,024,174		978,746
Eliminations	0		0		0
Reclassifications	0		0		0
Total assets	1,024,174		1,024,174		978,746
Reinsurance [Member]
Reconciliation of operating profit loss from segment to consolidated
Premiums earned	30,435	29,372	62,268	57,164
Underwriting profit (loss)	(1,850)	7,691	975	12,516
Net investment income (loss)	3,106	2,946	6,349	5,743
Realized investment gains (losses)	775	(217)	1,026	494
Other income	0	0	0	0
Interest expense	0	0	0	0
Other expenses	(181)	101	(14)	(340)
Income before income tax expense	2,212	10,319	8,364	19,093
Reconciliation of assets from segment to consolidated
Assets	413,061		413,061		387,284
Eliminations	0		0		0
Reclassifications	(465)		(465)		0
Total assets	412,596		412,596		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)	(6)	(5)
Realized investment gains (losses)	0	0	0	0
Other income	0	0	0	0
Interest expense	0	0	0	0
Other expenses	363	325	717	708
Income before income tax expense	(365)	(327)	(723)	(713)
Reconciliation of assets from segment to consolidated
Assets	486,734		486,734		455,368
Eliminations	(473,962)		(473,962)		(441,984)
Reclassifications	(146)		(146)		(481)
Total assets	$ 12,626		$ 12,626		$ 12,903