Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			$ (16,708)	$ (14,462)
Net Change	$ 1,111	$ (2,008)	2,338	(708)
Ending balance	(14,370)	(15,170)	(14,370)	(15,170)
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			(592)	1,711
Net Change			2,499	(1,085)
Ending balance	1,907	626	1,907	626
Net Change Related to Derivative Used for Cash Flow Hedge [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			(285)	(157)
Net Change			(497)	26
Ending balance	(782)	(131)	(782)	(131)
Net Change Related to Defined Benefit Pension Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			(15,831)	(16,016)
Net Change			336	351
Ending balance	$ (15,495)	$ (15,665)	$ (15,495)	$ (15,665)