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Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (2,452) $ (2,132)
Net change in other comprehensive income (loss) $ (83) $ 1,453 5,952 1,449
Ending Balance 3,500 (683) 3,500 (683)
Unrealized Gain on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1,306 3,389
Net change in other comprehensive income (loss)     5,119 544
Ending Balance 6,425 3,933 6,425 3,933
Unrealized Loss on Cash Flow Hedge        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (1,955) (3,298)
Net change in other comprehensive income (loss)     763 704
Ending Balance (1,192) (2,594) (1,192) (2,594)
Deferred Gain on Hedge Transactions        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     427 571
Net change in other comprehensive income (loss)     (110) (108)
Ending Balance 317 463 317 463
Defined Benefit Postretirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (2,230) (2,794)
Net change in other comprehensive income (loss)     180 309
Ending Balance $ (2,050) $ (2,485) $ (2,050) $ (2,485)