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, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 17,801
Other comprehensive income (loss):
Change in net actuarial loss	26	40
Tax effect on change in net actuarial gain	(9)	(14)
Net unrealized holding gains (losses) arising during the period	7,069	(1,646)
Tax effect on unrealized gains arising during the period	(2,474)	576
Reclassification adjustment for gains included in net realized gains (losses)	(861)	(185)
Tax effect on reclassification adjustment for gains included in net income	301	65
Other comprehensive income (loss), net of tax	4,052	(1,164)
Ending Balance	21,853
Minimum Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,600)	(1,480)
Other comprehensive income (loss):
Change in net actuarial loss	26	40
Tax effect on change in net actuarial gain	(9)	(14)
Other comprehensive income (loss), net of tax	17	26
Ending Balance	(2,583)	(1,454)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	20,401	18,363
Other comprehensive income (loss):
Net unrealized holding gains (losses) arising during the period	7,069	(1,646)
Tax effect on unrealized gains arising during the period	(2,474)	576
Reclassification adjustment for gains included in net realized gains (losses)	(861)	(185)
Tax effect on reclassification adjustment for gains included in net income	301	65
Other comprehensive income (loss), net of tax	4,035	(1,190)
Ending Balance	24,436	17,173
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	17,801	16,883
Other comprehensive income (loss):
Change in net actuarial loss	26	40
Tax effect on change in net actuarial gain	(9)	(14)
Net unrealized holding gains (losses) arising during the period	7,069	(1,646)
Tax effect on unrealized gains arising during the period	(2,474)	576
Reclassification adjustment for gains included in net realized gains (losses)	(861)	(185)
Tax effect on reclassification adjustment for gains included in net income	301	65
Other comprehensive income (loss), net of tax	4,052	(1,164)
Ending Balance	$ 21,853	$ 15,719