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Other Comprehensive Income (Loss) (Schedule of Other Comprehensive Income Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 364,571	$ 330,267	$ 252,348
Other Comprehensive Income (Loss) Before Reclassification	(3,943)	4,635
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(535)	(382)
Comprehensive Income (Loss)	(4,478)	4,253
ASU 2018-02 Adoption		(469)
Ending Balance	458,640	364,571	330,267
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(2,335)	(6,312)
Other Comprehensive Income (Loss) Before Reclassification	(3,866)	4,778
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(558)	(387)
Comprehensive Income (Loss)	(4,424)	4,391
ASU 2018-02 Adoption		(414)
Ending Balance	(6,759)	(2,335)	(6,312)
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(285)	(92)
Other Comprehensive Income (Loss) Before Reclassification	(77)	(143)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	23	5
Comprehensive Income (Loss)	(54)	(138)
ASU 2018-02 Adoption		(55)
Ending Balance	(339)	(285)	(92)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(2,620)	(6,404)	3,812
Ending Balance	$ (7,098)	$ (2,620)	$ (6,404)

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Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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