Comprehensive Income (Accumulated Balances for Each Classification of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Unrealized (Gains) Losses on Securities [Member] Available-For-Sale [Member]	Jun. 30, 2013 Unrealized (Gains) Losses on Securities [Member] Available-For-Sale [Member]	Mar. 31, 2013 Unrealized (Gains) Losses on Securities [Member] Available-For-Sale [Member]	Sep. 30, 2013 Unrealized (Gains) Losses on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Jun. 30, 2013 Unrealized (Gains) Losses on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Mar. 31, 2013 Unrealized (Gains) Losses on Securities [Member] Transferred From Available-For-Sale to Held-To-Maturity [Member]	Sep. 30, 2013 Pension and Postretirement Benefit Plans [Member]	Jun. 30, 2013 Pension and Postretirement Benefit Plans [Member]	Mar. 31, 2013 Pension and Postretirement Benefit Plans [Member]	Sep. 30, 2013 Interest Rate Swaps [Member]	Jun. 30, 2013 Interest Rate Swaps [Member]	Mar. 31, 2013 Interest Rate Swaps [Member]	Sep. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]
Comprehensive Income [Line Items]
Balance			$ 2,215		$ (2,097)	$ 4,748	$ 6,033	$ 0	$ 0	$ 0	$ (3,014)	$ (3,070)	$ (3,130)	$ (522)	$ (640)	$ (688)	$ (5,633)	$ 1,038	$ 2,215
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities					(461)	(6,853)	(1,285)	0	0	0
Other comprehensive income before reclassifications, Pension and postretirement benefit plans											0	0	0
Other comprehensive income before reclassifications, Interest rate swaps	6	35	172	117										6	118	48
Other comprehensive income before reclassifications, Accumulated other comprehensive income (loss)																	(455)	(6,735)	(1,237)
Transfer of securities from available-for-sale to held-to-maturity	(3,159)	0	(3,159)	0	3,159			(3,159)			0			0			0
Accretion of unrealized losses of securities transferred from available-for-sale to held-to-maturity recognized in other comprehensive income	129	0	129	0	0			129			0			0			129
Reclassification adjustments for (gains) losses reclassified into income, Unrealized (gains) losses on securities	0	17	8	(274)	0	8	0	0	0	0
Reclassification adjustments for (gains) losses reclassified into income, Pension and postretirement benefit plans											57	56	60
Reclassification adjustments for (gains) losses reclassified into income, Interest rate swaps														0	0	0
Reclassification adjustments for (gains) losses reclassified into income, Accumulated other comprehensive income (loss)																	57	64	60
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities	2,698	1,047	(5,440)	1,266	2,698	(6,845)	(1,285)	(3,030)	0	0
Net current period other comprehensive (loss) income, Pension and postretirement benefit plans	57	53	173	159							57	56	60
Net current period other comprehensive (loss) income, Interest rate swaps														6	118	48
Net current period other comprehensive (loss) income, Accumulated other comprehensive income (loss)																	(269)	(6,671)	(1,177)
Balance	$ (5,902)		$ (5,902)		$ 601	$ (2,097)	$ 4,748	$ (3,030)	$ 0	$ 0	$ (2,957)	$ (3,014)	$ (3,070)	$ (516)	$ (522)	$ (640)	$ (5,902)	$ (5,633)	$ 1,038