Investment Securities (Schedule Of Gross Unrealized Losses And Fair Value Of Securities) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 42,022	$ 31,163	$ 64,870
Less Than 12 Months Unrealized Losses	(240)	(238)	(607)
12 Months or More Fair Value	11,602	6,681	5,139
12 Month or More Unrealized Losses	(546)	(406)	(2,158)
Total Fair Value	53,624	37,844	70,009
Total Unrealized Losses	(786)	(644)	(2,764)
State, county and municipal securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	10,342	10,134	3,844
Less Than 12 Months Unrealized Losses	(73)	(90)	(39)
12 Months or More Fair Value			203
12 Month or More Unrealized Losses			(1)
Total Fair Value	10,342	10,134	4,047
Total Unrealized Losses	(73)	(90)	(40)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value		100	100
Less Than 12 Months Unrealized Losses			(1)
12 Months or More Fair Value	6,562	6,681	4,936
12 Month or More Unrealized Losses	(518)	(406)	(2,156)
Total Fair Value	6,562	6,781	5,036
Total Unrealized Losses	(518)	(406)	(2,157)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	31,680	20,929	60,926
Less Than 12 Months Unrealized Losses	(167)	(148)	(567)
12 Months or More Fair Value	5,040
12 Month or More Unrealized Losses	(28)
Total Fair Value	36,720	20,929	60,926
Total Unrealized Losses	$ (195)	$ (148)	$ (567)