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Investments (Schedule of amortized cost and estimated fair value of investment securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	$ 357,942	$ 303,905
Fair Value	364,651	320,410
U.S. Government and agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	13,498	14,383
States, territories and possessions and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	87,294	64,244
Corporate securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	147,621	126,030
Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	26,156	36,494
Commercial mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	33,532	25,655
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	52,422	51,200
Redeemable Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,128	2,404
Fixed income securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	357,942	303,905
Gross Unrealized Gains	9,008	16,801
Gross Unrealized Losses	(2,299)	(296)
Fair Value	364,651	320,410
Fixed income securities [Member] | U.S. Government and agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	13,118	13,334
Gross Unrealized Gains	467	1,055
Gross Unrealized Losses	(87)	(6)
Fair Value	13,498	14,383
Fixed income securities [Member] | States, territories and possessions and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	84,668	61,001
Gross Unrealized Gains	2,979	3,278
Gross Unrealized Losses	(353)	(35)
Fair Value	87,294	64,244
Fixed income securities [Member] | Corporate securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	144,476	117,628
Gross Unrealized Gains	4,214	8,549
Gross Unrealized Losses	(1,069)	(147)
Fair Value	147,621	126,030
Fixed income securities [Member] | Residential mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	26,190	35,017
Gross Unrealized Gains	266	1,478
Gross Unrealized Losses	(300)	(1)
Fair Value	26,156	36,494
Fixed income securities [Member] | Commercial mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	32,878	23,976
Gross Unrealized Gains	815	1,700
Gross Unrealized Losses	(161)	(21)
Fair Value	33,532	25,655
Fixed income securities [Member] | Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	52,604	50,751
Gross Unrealized Gains	131	535
Gross Unrealized Losses	(313)	(86)
Fair Value	52,422	51,200
Fixed income securities [Member] | Redeemable Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	4,008	2,198
Gross Unrealized Gains	136	206
Gross Unrealized Losses	(16)
Fair Value	$ 4,128	$ 2,404

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