Changes in Accumulated Other Comprehensive Income Balances (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 7,418
Other comprehensive income (loss):
Change in net actuarial gain	28	$ 26
Tax effect on change in net actuarial gain	(10)	(9)
Net unrealized holding gains (losses) arising during the period	1,371	7,069
Tax effect on unrealized gains arising during the period	(480)	(2,474)
Reclassification adjustment for gains included in net realized gains (losses)	(74)	(861)
Tax effect on reclassification adjustment for gains (losses) included in net income	26	301
Other comprehensive income (loss), net of tax	861	4,052
Ending Balance	8,279
Minimum Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,572)	(2,600)
Other comprehensive income (loss):
Change in net actuarial gain	28	26
Tax effect on change in net actuarial gain	(10)	(9)
Other comprehensive income (loss), net of tax	18	17
Ending Balance	(2,554)	(2,583)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	9,990	20,401
Other comprehensive income (loss):
Net unrealized holding gains (losses) arising during the period	1,371	7,069
Tax effect on unrealized gains arising during the period	(480)	(2,474)
Reclassification adjustment for gains included in net realized gains (losses)	(74)	(861)
Tax effect on reclassification adjustment for gains (losses) included in net income	26	301
Other comprehensive income (loss), net of tax	843	4,035
Ending Balance	10,833	24,436
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	7,418	17,801
Other comprehensive income (loss):
Change in net actuarial gain	28	26
Tax effect on change in net actuarial gain	(10)	(9)
Net unrealized holding gains (losses) arising during the period	1,371	7,069
Tax effect on unrealized gains arising during the period	(480)	(2,474)
Reclassification adjustment for gains included in net realized gains (losses)	(74)	(861)
Tax effect on reclassification adjustment for gains (losses) included in net income	26	301
Other comprehensive income (loss), net of tax	861	4,052
Ending Balance	$ 8,279	$ 21,853