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Change in Accumulated Other Comprehensive Income (Changes to Accumulated Other Comprehensive Income By Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward]      
Beginning balance $ 1,051 $ 1,315 $ 305
Other comprehensive (loss) income before reclassifications (1,531) (512) 2,519
Reclassifications from other comprehensive (loss) income (98) 113 (990)
Tax effect of current period changes 554 135 (519)
Total other comprehensive (loss) income (1,075) (264) 1,010
Ending balance (24) 1,051 1,315
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward]      
Beginning balance 1,012 1,466 547
Other comprehensive (loss) income before reclassifications (1,531) (564) 2,382
Reclassifications from other comprehensive (loss) income (98) (124) (990)
Tax effect of current period changes 554 234 (473)
Total other comprehensive (loss) income (1,075) (454) 919
Ending balance (63) 1,012 1,466
Change In Fair Value Of Interest Rate Swap [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward]      
Beginning balance 0 (190) (286)
Other comprehensive (loss) income before reclassifications   52 145
Reclassifications from other comprehensive (loss) income   237  
Tax effect of current period changes   (99) (49)
Total other comprehensive (loss) income   190 96
Ending balance   0 (190)
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] [Roll Forward]      
Beginning balance 39 39 44
Other comprehensive (loss) income before reclassifications 0 0 (8)
Tax effect of current period changes 0 0 3
Total other comprehensive (loss) income 0 0 (5)
Ending balance $ 39 $ 39 $ 39