Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Activity in the Liability for Unpaid Losses and Loss Adjustment Expenses for Property and Casualty Insurance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Paid related to:
Net balance at December 31	$ 113,090
Plus: reinsurance recoverables	64,873
Balance at December 31	177,963
Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	209,127	$ 228,970	$ 233,554
Less: reinsurance recoverables	87,083	94,920	94,490
Net balance at January 1	122,044	134,050	139,064
Incurred related to:
Current year	20,670	22,137	19,579
Prior years	(3,865)	(9,535)	(5,365)
Total incurred	16,805	12,602	14,214
Paid related to:
Current year	7,664	7,366	8,838
Prior years	18,095	17,242	10,390
Total paid	25,759	24,608	19,228
Net balance at December 31	113,090	122,044	134,050
Plus: reinsurance recoverables	64,873	87,083	94,920
Balance at December 31	177,963	209,127	$ 228,970
Operating Segments [Member] | Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	209,127
Paid related to:
Balance at December 31	$ 177,963	$ 209,127