Comprehensive Income (Components and Activity of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Comprehensive Income [Abstract]
Unrealized holding gains arising during the period, Pretax	$ 1,408	$ 2,281	$ 1,902	$ 4,675
Unrealized holding gains arising during the period, Tax	(479)	(776)	(647)	(1,590)
Unrealized holding losses arising during the period, After-tax	929	1,505	1,255	3,085
Reclassification adjustment for gains included in net income, Pretax	37	32	(493)	21
Reclassification adjustment for gains included in net income, Tax effect	(13)	(11)	167	(7)
Reclassification adjustment for gains included in net income, After-tax	24	21	(326)	14
Total other comprehensive income (loss), Pretax	1,445	2,313	1,409	4,696
Total other comprehensive income (loss), Tax effect	(492)	(787)	(480)	(1,597)
Total other comprehensive income (loss), After-tax	$ 953	$ 1,526	$ 929	$ 3,099