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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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Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale impacting investments.

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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).

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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