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Stock-Based Compensation Plan (Restricted Stock Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, authorized common stock	500,000
Shares, Nonvested, beginning of period	18,488	16,701
Shares, Granted	11,925	17,200
Shares, Vested	(9,933)	(10,000)
Shares, Forfeited	0	0
Shares, Nonvested, end of period	20,480	23,901
Weighted Average Grant Date Fair Value, Nonvested, beginning of period	$ 30.39	$ 29.72
Weighted Average Grant Date Fair Value, Granted	31.05	30.84
Weighted Average Grant Date Fair Value, Vested	30.13	29.38
Weighted average Grant Date Fair Value, Forfeited	0	0
Weighted Average Grant Date Fair Value, Nonvested, end of period	$ 30.90	$ 30.67
Deferred Compensation Arrangements Unrecognized Compensation Cost Related To Unvested Restricted Stock	$ 200
Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service period of grants to executive officers	9 months
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
Performance Measure [Member] | Executive Officers [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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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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