Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 7,418
Other comprehensive income (loss):
Change in net actuarial gain (loss)	(145)	$ 43	$ (1,723)
Tax effect on change in net actuarial gain (loss)	51	(15)	603
Unrealized holding (losses) gains arising during the period	6,019	(10,191)	3,543
Tax effect on unrealized gains (losses) arising during the period	(2,107)	3,567	(1,240)
Reclassification adjustment for gains included in net realized gains	(1,331)	(5,826)	(408)
Tax effect on reclassification adjustment for gains included in income tax expense	466	2,039	143
Other comprehensive income, net of tax	2,953	(10,383)	918
Ending Balance	10,371	7,418
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,572)	(2,600)	(1,480)
Other comprehensive income (loss):
Change in net actuarial gain (loss)	(145)	43	(1,723)
Tax effect on change in net actuarial gain (loss)	51	(15)	603
Other comprehensive income, net of tax	(94)	28	(1,120)
Ending Balance	(2,666)	(2,572)	(2,600)
Unrealized Gains (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	9,990	20,401	18,363
Other comprehensive income (loss):
Unrealized holding (losses) gains arising during the period	6,019	(10,191)	3,543
Tax effect on unrealized gains (losses) arising during the period	(2,107)	3,567	(1,240)
Reclassification adjustment for gains included in net realized gains	(1,331)	(5,826)	(408)
Tax effect on reclassification adjustment for gains included in income tax expense	466	2,039	143
Other comprehensive income, net of tax	3,047	(10,411)	2,038
Ending Balance	13,037	9,990	20,401
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	7,418	17,801	16,883
Other comprehensive income (loss):
Change in net actuarial gain (loss)	(145)	43	(1,723)
Tax effect on change in net actuarial gain (loss)	51	(15)	603
Unrealized holding (losses) gains arising during the period	6,019	(10,191)	3,543
Tax effect on unrealized gains (losses) arising during the period	(2,107)	3,567	(1,240)
Reclassification adjustment for gains included in net realized gains	(1,331)	(5,826)	(408)
Tax effect on reclassification adjustment for gains included in income tax expense	466	2,039	143
Other comprehensive income, net of tax	2,953	(10,383)	918
Ending Balance	10,371	7,418	$ 17,801
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	7,418
Other comprehensive income (loss):
Ending Balance	$ 10,371	$ 7,418