Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance			$ (14,462)	$ (9,955)
Net Change	$ 191	$ (253)	(517)	3,054
Ending balance	(14,979)	(6,901)	(14,979)	(6,901)
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			(756)	2,869
Ending balance	955	1,397	955	1,397
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			(288)	0
Ending balance	(445)	0	(445)	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			527	185
Ending balance	$ (15,489)	$ (8,298)	$ (15,489)	$ (8,298)