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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			$ (14,462)	$ (9,955)
Net Change	$ (2,008)	$ 1,554	(708)	3,307
Ending balance	(15,170)	(6,648)	(15,170)	(6,648)
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			1,711	(1,472)
Net Change			(1,085)	3,185
Ending balance	626	1,713	626	1,713
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			(157)	0
Net Change			26	0
Ending balance	(131)	0	(131)	0
Net Change Related to Defined Benefit Pension Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			(16,016)	(8,483)
Net Change			351	122
Ending balance	$ (15,665)	$ (8,361)	$ (15,665)	$ (8,361)