Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 17,801    
Other comprehensive income:      
Change in net actuarial gain (loss) 43 $ (1,723) $ 2,268
Tax effect on change in net actuarial gain (loss) (15) 603 (794)
Unrealized holding (losses) gains arising during the period (10,191) 3,543 22,094
Tax effect on unrealized gains (losses) arising during the period 3,567 (1,240) (7,733)
Reclassification adjustment for gains included in net realized gains (5,826) (408) (10,540)
Tax effect on reclassification adjustment for gains included in income tax expense 2,039 143 3,689
Other comprehensive income, net of tax (10,383) 918 8,984
Ending Balance 7,418 17,801  
Pension Liability [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (2,600) (1,480) (2,954)
Other comprehensive income:      
Change in net actuarial gain (loss) 43 (1,723) 2,268
Tax effect on change in net actuarial gain (loss) (15) 603 (794)
Other comprehensive income, net of tax 28 (1,120) 1,474
Ending Balance (2,572) (2,600) (1,480)
Unrealized Gains (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 20,401 18,363 10,853
Other comprehensive income:      
Unrealized holding (losses) gains arising during the period (10,191) 3,543 22,094
Tax effect on unrealized gains (losses) arising during the period 3,567 (1,240) (7,733)
Reclassification adjustment for gains included in net realized gains (5,826) (408) (10,540)
Tax effect on reclassification adjustment for gains included in income tax expense 2,039 143 3,689
Other comprehensive income, net of tax (10,411) 2,038 7,510
Ending Balance 9,990 20,401 18,363
Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 17,801 16,883 7,899
Other comprehensive income:      
Change in net actuarial gain (loss) 43 (1,723) 2,268
Tax effect on change in net actuarial gain (loss) (15) 603 (794)
Unrealized holding (losses) gains arising during the period (10,191) 3,543 22,094
Tax effect on unrealized gains (losses) arising during the period 3,567 (1,240) (7,733)
Reclassification adjustment for gains included in net realized gains (5,826) (408) (10,540)
Tax effect on reclassification adjustment for gains included in income tax expense 2,039 143 3,689
Other comprehensive income, net of tax (10,383) 918 8,984
Ending Balance 7,418 17,801 $ 16,883
Parent Company [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 17,801    
Other comprehensive income:      
Ending Balance $ 7,418 $ 17,801