Changes in Accumulated Other Comprehensive Income Balances (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 16,883
Other comprehensive (loss) income:
Change in net actuarial gain	40	123
Tax effect on change in net actuarial gain	(14)	(43)
Net unrealized holding gains (losses) arising during the period	(1,646)	8,898
Tax effect on unrealized gains arising during the period	576	(3,114)
Reclassification adjustment for losses included in net realized gains (losses)	(185)	(1,176)
Tax effect on reclassification adjustment for gains included in net income tax expense	65	411
Other comprehensive income (loss), net of tax	(1,164)	5,099
Ending Balance	15,719
Minimum Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,480)	(2,954)
Other comprehensive (loss) income:
Change in net actuarial gain	40	123
Tax effect on change in net actuarial gain	(14)	(43)
Other comprehensive income (loss), net of tax	26	80
Ending Balance	(1,454)	(2,874)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	18,363	10,853
Other comprehensive (loss) income:
Net unrealized holding gains (losses) arising during the period	(1,646)	8,898
Tax effect on unrealized gains arising during the period	576	(3,114)
Reclassification adjustment for losses included in net realized gains (losses)	(185)	(1,176)
Tax effect on reclassification adjustment for gains included in net income tax expense	65	411
Other comprehensive income (loss), net of tax	(1,190)	5,019
Ending Balance	17,173	15,872
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	16,883	7,899
Other comprehensive (loss) income:
Change in net actuarial gain	40	123
Tax effect on change in net actuarial gain	(14)	(43)
Net unrealized holding gains (losses) arising during the period	(1,646)	8,898
Tax effect on unrealized gains arising during the period	576	(3,114)
Reclassification adjustment for losses included in net realized gains (losses)	(185)	(1,176)
Tax effect on reclassification adjustment for gains included in net income tax expense	65	411
Other comprehensive income (loss), net of tax	(1,164)	5,099
Ending Balance	$ 15,719	$ 12,998