Changes in Accumulated Other Comprehensive Income Balances (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 7,418
Other comprehensive income (loss):
Change in net actuarial gain	$ 28	$ 26	85	$ 78
Tax effect on change in net actuarial gain	(10)	(9)	(30)	(27)
Net unrealized holding gains (losses) arising during the period	2,039	(10,821)	7,767	(7,858)
Tax effect on unrealized gains arising during the period	(714)	3,787	(2,718)	2,750
Reclassification adjustment for gains included in net realized gains (losses)	(1,105)	(28)	(1,589)	(5,881)
Tax effect on reclassification adjustment for gains (losses) included in net income	387	10	556	2,058
Other comprehensive income (loss), net of tax	625	(7,035)	4,071	(8,880)
Ending Balance	11,489		11,489
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			85	78
Tax effect on change in net actuarial gain			(30)	(27)
Other comprehensive income (loss), net of tax			55	51
Ending Balance	(2,517)	(2,549)	(2,517)	(2,549)
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			7,767	(7,858)
Tax effect on unrealized gains arising during the period			(2,718)	2,750
Reclassification adjustment for gains included in net realized gains (losses)			(1,589)	(5,881)
Tax effect on reclassification adjustment for gains (losses) included in net income			556	2,058
Other comprehensive income (loss), net of tax			4,016	(8,931)
Ending Balance	14,006	11,470	14,006	11,470
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			85	78
Tax effect on change in net actuarial gain			(30)	(27)
Net unrealized holding gains (losses) arising during the period			7,767	(7,858)
Tax effect on unrealized gains arising during the period			(2,718)	2,750
Reclassification adjustment for gains included in net realized gains (losses)			(1,589)	(5,881)
Tax effect on reclassification adjustment for gains (losses) included in net income			556	2,058
Other comprehensive income (loss), net of tax			4,071	(8,880)
Ending Balance	$ 11,489	$ 8,921	$ 11,489	$ 8,921