Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 22,898	$ 28,614	$ 23,960
Audited statutory capital and surplus	227,380	226,999	216,763
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	2,438	2,906	1,612
Audited statutory capital and surplus	15,928	12,851	9,390
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	6,296	18,599	11,367
Audited statutory capital and surplus	218,301	223,264	203,723
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	8,082	8,043	8,735
Audited statutory capital and surplus	25,980	26,305	27,232
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	2,127	1,942	1,436
Audited statutory capital and surplus	$ 13,980	$ 13,371	$ 12,817