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Investments (Narrative) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 USD ($) item security | Dec. 31, 2021 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 509,787 | $ 529,811
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 | 553 | 227
Fair value of temporarily impaired securities | $ 479,463 | $ 271,525
Unrealized Losses | 44,808 | 4,666
Total unrealized loss position increased over prior year | $ 40,100 |
Number Of Bond Issuers | item | 203 |
Number Of Bonds Below Investment Grade | item | 0 |
General Obligation Bonds | 63.00% |
Equity securities | $ 495 | 481
Texas [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Percent of Investment Portfolio | 14.00% |
Pennsylvania [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Percent of Investment Portfolio | 11.00% |
CALIFORNIA |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Percent of Investment Portfolio | 11.00% |
MICHIGAN |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Percent of Investment Portfolio | 10.00% |
Corporate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 24,829 | $ 24,939
Number of debt securities | security | 42 | 20
Fair value of temporarily impaired securities | $ 21,524 | $ 10,648
Unrealized Losses | 982 | 188
Public Funds And Trust Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 196,100 | $ 160,300
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of equity investments | item | 1 |

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