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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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