Comprehensive Income (Schedule of Components of Comprehensive Income) (Details) (New) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Comprehensive Income [Abstract]
Unrealized holding gains on available-for-sale securities			$ 9,372	$ 7,543
Unrealized holding gains on available-for-sale securities, Tax effect			3,463	2,906
Unrealized gains and losses on securities available-for-sale: Unrealized holding gains arising during the period	2,721	2,855	5,909	4,637
Reclassification adjustment of OTTI losses included in income			198	237
Reclassification adjustment of OTTI losses included in income, Tax effect			67	84
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment on OTTI losses included in income	93	92	131	153
Reclassification adjustment for net gains arising during this period			(1,648)	(1,804)
Reclassification adjustment for net gains arising during this period, Tax effect			(556)	(642)
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment for net gains arising during the period	(432)	(613)	(1,092)	(1,162)
Unrealized gains and losses on securities available-for-sale: Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity securities			6	3
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity			6	3
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity, Tax effect			2	1
Unrealized gains and losses on securities available-for-sale: Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity securities	10	2	4	2
Change in minimum pension liability				142
Change in minimum pension liability, Tax effect				57
Change in minimum pension liability, Net of tax amount				85
Total other comprehensive income (see Note 6)	$ 2,392	$ 2,541	$ 4,952	$ 3,750