Employee Benefit Plans (Schedule of Changes in Benefit Obligation and Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amounts recognized in accumulated other comprehensive loss      
Total $ 2,163 $ 1,841  
Supplemental Executive Retirement Plan [Member]      
Benefit obligations:      
Beginning of year 9,927 10,346  
Service cost 270 326 269
Interest cost 456 377 408
Actuarial (gain) loss 777 (579)  
Benefits paid (596) (543)  
End of year 10,834 9,927 10,346
Fair value of plan assets:      
Beginning of year 0 0  
Employer contributions 596 543  
Benefits paid (596) (543)  
End of year 0 0 0
Funded status at end of year, included in other liabilities 10,834 9,927  
Amounts recognized in accumulated other comprehensive loss      
Net actuarial loss 1,953 1,539  
Prior service cost (credit) 17 29  
Total 1,970 1,568  
Other Postretirement Benefit Plan [Member]      
Benefit obligations:      
Beginning of year 3,094 3,536  
Service cost 45 42 70
Interest cost 132 173 148
Actuarial (gain) loss (134) (538)  
Benefits paid (140) (119)  
End of year 2,997 3,094 3,536
Fair value of plan assets:      
Beginning of year 0 0  
Employer contributions 140 119  
Benefits paid (140) (119)  
End of year 0 0 0
Funded status at end of year, included in other liabilities 2,997 3,094  
Amounts recognized in accumulated other comprehensive loss      
Net actuarial loss 378 458  
Prior service cost (credit) (185) (185)  
Total $ 193 $ 273