Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	$ 14,291	$ 16,002
Future Policy Benefits, Losses, Claims and Loss Adjustment Expenses	527,247	527,100
Unearned Premiums	298,061	276,642
Premium Revenue	363,087	361,037
Net Investment Income	18,232	18,874
Benefits Claims, Losses and Settlement Expenses	256,028	288,308
Amortization of Deferred Policy Acquisition Costs	37,436	34,265
Other Operating Expenses	101,712	103,615
Net Premiums Written	363,798	365,583
Specialty Commercial Segment Member
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	5,637	8,668
Future Policy Benefits, Losses, Claims and Loss Adjustment Expenses	429,741	416,788
Unearned Premiums	234,563	224,903
Premium Revenue	258,186	259,086
Net Investment Income	19,302	16,809
Benefits Claims, Losses and Settlement Expenses	194,268	213,050
Amortization of Deferred Policy Acquisition Costs	21,133	21,600
Other Operating Expenses	52,071	57,458
Net Premiums Written	251,731	265,022
Standard Commercial Segment [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	5,212	6,421
Future Policy Benefits, Losses, Claims and Loss Adjustment Expenses	74,677	87,323
Unearned Premiums	40,813	37,574
Premium Revenue	72,321	66,218
Net Investment Income	3,736	3,855
Benefits Claims, Losses and Settlement Expenses	39,396	45,227
Amortization of Deferred Policy Acquisition Costs	13,415	10,890
Other Operating Expenses	22,825	23,180
Net Premiums Written	69,222	69,288
Personal Segment [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	3,442	913
Future Policy Benefits, Losses, Claims and Loss Adjustment Expenses	22,829	22,989
Unearned Premiums	22,685	14,165
Premium Revenue	32,580	35,733
Net Investment Income	1,185	1,194
Benefits Claims, Losses and Settlement Expenses	22,364	30,031
Amortization of Deferred Policy Acquisition Costs	2,888	1,775
Other Operating Expenses	15,420	12,712
Net Premiums Written	42,845	31,273
Corporate [Member]
Supplementary Insurance Information, by Segment [Line Items]
Net Investment Income, Corporate	(5,991)	(2,984)
Other Operating Expenses	$ 11,396	$ 10,265