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Investments (Narrative) (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 512,247,000 | $ 396,940,000
Number of temporarily impaired securities | item | 136 | 102
Unrealized Losses | $ 1,885,000 | $ 701,000
Restricted stock | 495,000 | 468,000
Equity securities | $ 482,000 | 391,000
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of temporarily impaired securities | item | 136 |
Temporarily impaired fair value | $ 128,900,000 |
Unrealized Losses | 1,900,000 | $ 1,200,000
Public Funds And Trust Deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 137,400,000 |

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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale impacting investments. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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