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Investments (Amortized Cost And Fair Value Of Debt Securities, By Contractual Maturity) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 540,006,000 | $ 384,369,000
Fair Value | 545,788,000 | $ 396,940,000
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Due in one year or less, Amortized cost | 2,613,000 |
Due after one year through five years, Amortized cost | 21,770,000 |
Due after five years through ten years, Amortized cost | 268,783,000 |
Due after ten years, Amortized cost | 48,015,000 |
Amortized cost | 341,181,000 |
Due in one year or less, Fair value | 2,644,000 |
Due after one year through five years, Fair value | 22,368,000 |
Due after five years through ten years, Fair value | 274,542,000 |
Due after ten years, Fair value | 47,324,000 |
Fair Value | 346,878,000 |
Mortgage-Backed And Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mortgage-backed securities, Amortized cost | 198,825,000 |
Mortgage-backed securities, Fair value | $ 198,910,000 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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