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v3.23.1

Investments (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) item security | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value | $ 457,767 |  | $ 486,836
Number of investments in a single issuer exceeds 10% of shareholders' equity | item | 0 |  |
Percent of shareholders equity benchmark for investments in a single issuer | 10.00% |  |
Number of debt securities | security | 571 |  | 591
Fair value of temporarily impaired securities | $ 448,593 |  | $ 474,847
Unrealized Losses | 52,365 |  | 61,531
Decrease in unrealized loss position | 9,200 |  |
Equity securities | 387 |  | 411
Debt Securities, Available-for-sale, Realized Gain (Loss) | (602) |  |
Proceeds from Sale of Debt Securities, Available-for-sale | 32,855 |  |
Corporate [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value | $ 23,999 |  | $ 24,239
Number of debt securities | security | 51 |  | 46
Fair value of temporarily impaired securities | $ 23,999 |  | $ 22,589
Unrealized Losses | 2,382 |  | 2,077
Public Funds And Trust Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value | $ 147,100 |  | $ 208,900
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of equity investments | item | 1 |  |

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