Changes in Accumulated Other Comprehensive Income Balances (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 10,371
Other comprehensive income (loss):
Change in net actuarial gain	35	$ 28
Tax effect on change in net actuarial gain	(12)	(10)
Net unrealized holding gains (losses) arising during the period	5,246	1,371
Tax effect on unrealized gains arising during the period	(1,836)	(480)
Reclassification adjustment for gains included in net realized gains (losses)	(2,501)	(74)
Tax effect on reclassification adjustment for gains (losses) included in net income	875	26
Other comprehensive income (loss), net of tax	1,807	861
Ending Balance	12,178
Minimum Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,666)	(2,572)
Other comprehensive income (loss):
Change in net actuarial gain	35	28
Tax effect on change in net actuarial gain	(12)	(10)
Other comprehensive income (loss), net of tax	23	18
Ending Balance	(2,643)	(2,554)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	13,037	9,990
Other comprehensive income (loss):
Net unrealized holding gains (losses) arising during the period	5,246	1,371
Tax effect on unrealized gains arising during the period	(1,836)	(480)
Reclassification adjustment for gains included in net realized gains (losses)	(2,501)	(74)
Tax effect on reclassification adjustment for gains (losses) included in net income	875	26
Other comprehensive income (loss), net of tax	1,784	843
Ending Balance	14,821	10,833
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	10,371	7,418
Other comprehensive income (loss):
Change in net actuarial gain	35	28
Tax effect on change in net actuarial gain	(12)	(10)
Net unrealized holding gains (losses) arising during the period	5,246	1,371
Tax effect on unrealized gains arising during the period	(1,836)	(480)
Reclassification adjustment for gains included in net realized gains (losses)	(2,501)	(74)
Tax effect on reclassification adjustment for gains (losses) included in net income	875	26
Other comprehensive income (loss), net of tax	1,807	861
Ending Balance	$ 12,178	$ 8,279