Comprehensive Income (Accumulated Balances for Each Classification of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 Transferred From Available-For-Sale to Held-To-Maturity [Member]	Jun. 30, 2014 Unrealized Gains (Losses) on Securities [Member] Available-For-Sale [Member]	Jun. 30, 2014 Unrealized Gains (Losses) on Securities [Member] Available-For-Sale [Member]	Jun. 30, 2014 Unrealized Gains (Losses) on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Jun. 30, 2014 Unrealized Gains (Losses) on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Jun. 30, 2014 Pension and Postretirement Benefit Plans [Member]	Jun. 30, 2014 Pension and Postretirement Benefit Plans [Member]	Jun. 30, 2014 Interest Rate Swaps [Member]	Jun. 30, 2014 Interest Rate Swaps [Member]	Jun. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ (5,720)			$ 540	$ (162)	$ (3,175)	$ (3,296)	$ (1,769)	$ (1,790)	$ (431)	$ (472)	$ (4,835)	$ (5,720)
Other comprehensive income before reclassifications						907	1,699					24	65	931	1,764
Transfer of securities from available-for-sale to held-to-maturity	0	0	8	0	(8,310)		(8)		8
Accretion of unrealized losses of securities transferred from available-for-sale to held-to-maturity recognized in other comprehensive income	111	0	224	0				111	224					111	224
Reclassification adjustments for (gains) losses reclassified into income						(11)	(93)			21	42			10	(51)
Other comprehensive income (loss)	1,052	(6,671)	1,937	(7,848)		896	1,598	111	232	21	42	24	65	1,052	1,937
Balance	$ (3,783)		$ (3,783)			$ 1,436	$ 1,436	$ (3,064)	$ (3,064)	$ (1,748)	$ (1,748)	$ (407)	$ (407)	$ (3,783)	$ (3,783)