Investment Securities (Schedule Of Gross Unrealized Losses And Fair Value Of Securities) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 47,313	$ 31,163	$ 33,841
Less Than 12 Months Unrealized Losses	(399)	(238)	(304)
12 Months or More Fair Value	9,490	6,681	6,732
12 Month or More Unrealized Losses	(589)	(406)	(357)
Total Fair Value	56,803	37,844	40,573
Total Unrealized Losses	(988)	(644)	(661)
U.S. government agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value
Less Than 12 Months Unrealized Losses
12 Months or More Fair Value
12 Month or More Unrealized Losses
Total Fair Value
Total Unrealized Losses
State, county and municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	14,653	10,134
Less Than 12 Months Unrealized Losses	(132)	(90)
12 Months or More Fair Value	505
12 Month or More Unrealized Losses	(12)
Total Fair Value	15,158	10,134
Total Unrealized Losses	(144)	(90)
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value		100	100
12 Months or More Fair Value	5,551	6,681	6,732
12 Month or More Unrealized Losses	(560)	(406)	(357)
Total Fair Value	5,551	6,781	6,832
Total Unrealized Losses	(560)	(406)	(357)
Mortgage backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	32,660	20,929	33,741
Less Than 12 Months Unrealized Losses	(267)	(148)	(304)
12 Months or More Fair Value	3,434
12 Month or More Unrealized Losses	(17)
Total Fair Value	36,094	20,929	33,741
Total Unrealized Losses	$ (284)	$ (148)	$ (304)