Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 28,614	$ 23,960	$ 16,328
Audited statutory capital and surplus	226,999	216,763	197,375
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	2,906	1,612	1,190
Audited statutory capital and surplus	12,851	9,390	7,991
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	18,599	11,367	10,350
Audited statutory capital and surplus	223,264	203,723	195,931
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	8,043	8,735	8,062
Audited statutory capital and surplus	26,305	27,232	26,653
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,942	1,436	1,594
Audited statutory capital and surplus	$ 13,371	$ 12,817	$ 12,674