Other Comprehensive Income/Loss (Components of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax [Abstract]
Net unrealized holding loss on securities arising during the period, before tax amount	$ (4,491)		$ (1,268)
Reclassification adjustment for gain on sales of securities included in net income, before tax amount	(72)		(72)
Net unrealized loss on securities available-for-sale	(4,563)	$ 7,263	(1,340)	$ 11,891
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [Abstract]
Net unrealized holding loss on securities arising during the period, income tax expense	1,743		513
Realization of prior year securities tax adjustment	29		29
Net unrealized loss on securities available-for-sale	1,772	(2,564)	542	(4,199)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax [Abstract]
Net unrealized holding loss on securities arising during the period, after tax amount	(2,748)	4,699	(755)	7,692
Reclassification adjustment for gain on sales of securities included in net income	(43)		(43)
Net unrealized (loss) gain on securities available-for-sale	(2,791)	4,699	(798)	7,692
Net actuarial loss adjustment on pension plans and other postretirement benefits before tax amount:
Reclassification adjustment for net actuarial loss on pension plans and other postretirement benefits included in net income	729	249	1,486	457
Reclassification adjustment for prior service cost on pension plans and other postretirement benefits included in net income	48	48	95	95
Total other comprehensive income, before tax amount	(3,786)	7,560	241	12,443
Net actuarial loss adjustment on pension plans and other postretirement benefits, tax expense:
Reclassification adjustment for net actuarial loss on pension plans and other postretirement benefits included in net income	(312)	(88)	(600)	(161)
Reclassification adjustment for prior service cost on pension plans and other postretirement benefits included in net income	(21)	(17)	(39)	(34)
Total other comprehensive income, tax expense	1,439	(2,669)	(97)	(4,394)
Net unrealized gain on securities available-for-sale:
Reclassification adjustment for net actuarial loss on pension plans and other postretirement benefits included in net income	417	161	886	296
Reclassification adjustment for prior service cost included in net income	27	31	56	61
Total other comprehensive (loss) income, net of tax	$ (2,347)	$ 4,891	$ 144	$ 8,049