Financial Derivatives (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Derivative [Line Items]
Written credit derivative spread threshold	20.00%		20.00%
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Credit risk derivative in excess of threshold, at fair value, net	$ (33)		$ 38
Total net up-front payments received	$ 800	$ 800
Minimum
Derivative [Line Items]
Spread on written credit derivatives	17.45%		11.27%
Upfront points on written credit derivative in excess of threshold	46.3		55.4
Maximum
Derivative [Line Items]
Spread on written credit derivatives	46.21%		14.11%
Upfront points on written credit derivative in excess of threshold	88.8		85.2