Changes in Accumulated Other Comprehensive Income Balances (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 7,418
Other comprehensive income (loss):
Change in net actuarial gain	$ 29	$ 26	57	$ 52
Tax effect on change in net actuarial gain	(10)	(9)	(20)	(18)
Net unrealized holding gains (losses) arising during the period	4,358	(4,106)	5,729	2,963
Tax effect on unrealized gains arising during the period	(1,525)	1,437	(2,005)	(1,037)
Reclassification adjustment for gains included in net realized gains (losses)	(410)	(4,992)	(484)	(5,853)
Tax effect on reclassification adjustment for gains (losses) included in net income	143	1,747	169	2,048
Other comprehensive income (loss), net of tax	2,585	(5,897)	3,446	(1,845)
Ending Balance	10,864		10,864
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			57	52
Tax effect on change in net actuarial gain			(20)	(18)
Other comprehensive income (loss), net of tax			37	34
Ending Balance	(2,535)	(2,566)	(2,535)	(2,566)
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			5,729	2,963
Tax effect on unrealized gains arising during the period			(2,005)	(1,037)
Reclassification adjustment for gains included in net realized gains (losses)			(484)	(5,853)
Tax effect on reclassification adjustment for gains (losses) included in net income			169	2,048
Other comprehensive income (loss), net of tax			3,409	(1,879)
Ending Balance	13,399	18,522	13,399	18,522
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			57	52
Tax effect on change in net actuarial gain			(20)	(18)
Net unrealized holding gains (losses) arising during the period			5,729	2,963
Tax effect on unrealized gains arising during the period			(2,005)	(1,037)
Reclassification adjustment for gains included in net realized gains (losses)			(484)	(5,853)
Tax effect on reclassification adjustment for gains (losses) included in net income			169	2,048
Other comprehensive income (loss), net of tax			3,446	(1,845)
Ending Balance	$ 10,864	$ 15,956	$ 10,864	$ 15,956