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Stock-Based Compensation Plan (Restricted Stock Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock incentive plan, authorized common stock	500,000
Deferred Compensation Arrangements Unrecognized Compensation Cost Related To Unvested Restricted Stock	$ 635
Shares, Nonvested, beginning of period	20,928	18,488
Shares, Granted	21,630	11,925
Shares, Vested	(10,258)	(9,933)
Shares, Forfeited	(425)
Shares, Nonvested, end of period	31,875	20,480
Weighted Average Grant Date Fair Value, Nonvested, beginning of period	$ 29.98	$ 30.39
Weighted Average Grant Date Fair Value, Granted	29.69	31.05
Weighted Average Grant Date Fair Value, Vested	31.11	31.13
Weighted average Grant Date Fair Value, Forfeited	31.05
Weighted Average Grant Date Fair Value, Nonvested, end of period	$ 29.41	$ 30.90
Service Period [Member] | Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting service period of grants to executive officers	3 years
Preformence Measure [Mmeber] | Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting service period of grants to executive officers	1 year

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Deferred Compensation Arrangements Unrecognized Compensation Cost Related To Unvested Restricted Stock

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares authorized for issuance under share-based payment arrangement.

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