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v3.23.3

Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) security item | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value |  | $ 458,276 |  | $ 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 |  | 578 |  | 591
Fair value of temporarily impaired securities |  | $ 448,915 |  | $ 474,847
Unrealized Losses |  | 67,340 |  | 61,531
Decrease in unrealized loss position |  | 5,800 |  |
Gross unrealized gains |  | 88 |  | 34
Equity securities |  | 386 |  | 411
Debt Securities, Available-for-sale, Realized Gain (Loss) | $ (15) | (1,119) | $ (34) |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 1,000 | 40,117 | $ 1,082 |
Corporate [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value |  | $ 22,983 |  | $ 24,239
Number of debt securities | security |  | 51 |  | 46
Fair value of temporarily impaired securities |  | $ 22,983 |  | $ 22,589
Unrealized Losses |  | 3,348 |  | 2,077
Public Funds And Trust Deposits [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value |  | $ 199,100 |  | $ 208,900
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of equity investments | item |  | 1 |  |

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