Comprehensive Income (Accumulated Balances for Each Classification of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013 Transferred From Available-For-Sale to Held-To-Maturity [Member]	Mar. 31, 2014 Unrealized (Gains) Losses on Securities [Member] Available-For-Sale [Member]	Mar. 31, 2013 Unrealized (Gains) Losses on Securities [Member] Available-For-Sale [Member]	Mar. 31, 2014 Unrealized (Gains) Losses on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Mar. 31, 2014 Pension and Postretirement Benefit Plans [Member]	Mar. 31, 2013 Pension and Postretirement Benefit Plans [Member]	Mar. 31, 2014 Interest Rate Swaps [Member]	Mar. 31, 2013 Interest Rate Swaps [Member]	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]
Comprehensive Income [Line Items]
Balance	$ (5,720)			$ (162)	$ 6,033	$ (3,296)	$ (1,790)	$ (3,130)	$ (472)	$ (688)	$ (5,720)	$ 2,215
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities				792	(1,285)
Interest rate swaps, net current period change	41	48							41	48
Other comprehensive income before reclassifications, Accumulated other comprehensive income (loss)											833	(1,237)
Transfer of securities from available-for-sale to held-to-maturity	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	113	0				113					113
Reclassification adjustments for (gains) losses reclassified into income, Unrealized (gains) losses on securities	(82)	0		(82)
Reclassification adjustments for (gains) losses reclassified into income, Pension plan							21	60
Reclassification adjustments for (gains) losses reclassified into income, Accumulated other comprehensive income (loss)											(61)	60
Net current period other comprehensive income, Unrealized (gains) losses on securities	784	(1,285)		702	(1,285)	121
Net current period other comprehensive income, Pension plan	21	60					21	60
Net current period other comprehensive income, Interest rate swaps									41	48
Net current period other comprehensive income, Accumulated other comprehensive income (loss)											885	(1,177)
Balance	$ (4,835)			$ 540	$ 4,748	$ (3,175)	$ (1,769)	$ (3,070)	$ (431)	$ (640)	$ (4,835)	$ 1,038