Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 16,883
Other comprehensive income:
Change in net actuarial loss	(1,723)	2,268	37
Tax effect on change in net actuarial loss	603	(794)	(13)
Unrealized holding gains arising during the period	3,543	22,094	4,388
Tax effect on unrealized gains arising during the period	(1,240)	(7,733)	(1,536)
Reclassification adjustment for gains included in net realized gains	(408)	(10,540)	(2,189)
Tax effect on reclassification adjustment for gains included in net income (loss)	143	3,689	766
Other comprehensive income, net of tax	918	8,984	1,453
Ending Balance	17,801	16,883
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,480)	(2,954)	(2,978)
Other comprehensive income:
Change in net actuarial loss	(1,723)	2,268	37
Tax effect on change in net actuarial loss	603	(794)	(13)
Other comprehensive income, net of tax	(1,120)	1,474	24
Ending Balance	(2,600)	(1,480)	(2,954)
Unrealized Gains (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	18,363	10,853	9,424
Other comprehensive income:
Unrealized holding gains arising during the period	3,543	22,094	4,388
Tax effect on unrealized gains arising during the period	(1,240)	(7,733)	(1,536)
Reclassification adjustment for gains included in net realized gains	(408)	(10,540)	(2,189)
Tax effect on reclassification adjustment for gains included in net income (loss)	143	3,689	766
Other comprehensive income, net of tax	2,038	7,510	1,429
Ending Balance	20,401	18,363	10,853
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	16,883	7,899	6,446
Other comprehensive income:
Change in net actuarial loss	(1,723)	2,268	37
Tax effect on change in net actuarial loss	603	(794)	(13)
Unrealized holding gains arising during the period	3,543	22,094	4,388
Tax effect on unrealized gains arising during the period	(1,240)	(7,733)	(1,536)
Reclassification adjustment for gains included in net realized gains	(408)	(10,540)	(2,189)
Tax effect on reclassification adjustment for gains included in net income (loss)	143	3,689	766
Other comprehensive income, net of tax	918	8,984	1,453
Ending Balance	17,801	16,883	7,899
Parent Company [Member]
Other comprehensive income:
Ending Balance	$ 17,801	$ 16,883